Glen Canyon Dam AMP - User contributions [en]

Hydrology

2026-10-14T15:22:05Z

Cellsworth:

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[[File:Hydrology.jpg|center|300px]]


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=='''Upper Colorado River Basin Hydrology'''==
Upper Colorado River Basin regularly experiences significant year to year hydrologic variability. During the 21-year period 2000 to 2020, however, the unregulated inflow to Lake Powell, which is a good measure of hydrologic conditions in the Colorado River Basin, was above average in only 4 out of the past 19 years. The period 2000-2020 is the lowest 21-year period since the closure of Glen Canyon Dam in 1963, with an average unregulated inflow of 8.62 maf, or 80 percent of the 30-year average (1981-2010). (For comparison, the 1981-2010 total water year average is 10.83 maf.) The unregulated inflow during the 2000-2020 period has ranged from a low of 2.64 maf (24 percent of average) in water year 2002 to a high of 15.97 maf (147 percent of average) in water year 2011. In water year 2018 unregulated inflow volume to Lake Powell was 4.6 maf (43 percent of average), the third driest year on record above 2002 and 1977. [http://www.usbr.gov/uc/water/crsp/cs/gcd.html]

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{| style="width:100%; height:50px" border=1px solid #ccc; background:#cedff2
! style="width=33%; background:#cedff2;" | [http://www.usbr.gov/uc/water/crsp/cs/gcd.html Current Status] <br>
! style="width=33%; background:#cedff2;" | [http://www.usbr.gov/uc/water/crsp/cs/gcd.html Current Operations] <br>
! style="width=33%; background:#cedff2;" | [http://www.usbr.gov/uc/water/crsp/cs/gcd.html Inflow Forecasts and Model Projections] <br>
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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; text-align:left; color:#000; padding:0.2em 0.4em;">Updates</h2>
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=='''[https://www.usbr.gov/uc/index.html Upper Colorado Region Homepage]'''==
*[https://www.usbr.gov/uc/water/hydrodata/reservoir_data/919/dashboard.html Hydrodata dashboard for Lake Powell]
*[https://www.nrcs.usda.gov/Internet/WCIS/basinCharts/POR/WTEQ/assocHUC2/Upper%20Colorado%20Region.html Lake Powell Snow Chart]
*[https://www.usbr.gov/uc/water/crsp/studies/images/PowellForecast.png Lake Powell Inflow Forecast]
*[https://www.usbr.gov/uc/water/crsp/studies/images/PowellElevations.png Lake Powell Elevation Projections]
*[https://www.usbr.gov/uc/water/crsp/studies/images/PowellRelease.png Lake Powell Release Projections]
*[https://www.usbr.gov/uc/water/crsp/cs/gcd.html Glen Canyon Dam Operations]

== '''USBR Weekly Water Reports''' ==
*[https://www.usbr.gov/uc/water/rsvrs/ops/WeeklyHydrologySummary/Weekly_Hydro.pdf Upper Colorado Region Weekly Hydrology Summary]
#Reservoir inflows (forecast and observed)
#Reservoir releases
#SNOTEL

*[http://www.usbr.gov/lc/region/g4000/weekly.pdf Lower Colorado Water Supply Report]
#Water use

*[http://www.usbr.gov/lc/region/g4000/wtracct.html Lower Colorado River Water Accounting]
*[https://www.usbr.gov/uc/water/basin/index.html Colorado River Basin Tea-Cup Diagrams]

== '''USBR Monthly/Annual Reports''' ==
*[https://www.usbr.gov/uc/water/crsp/studies/index.html 24-Month Studies]

#[https://www.usbr.gov/lc/region/g4000/24mo.pdf Most Probable 24-Month Study]
#[https://www.usbr.gov/lc/region/g4000/24mo_MIN.pdf Probable Minimum 24-Month Study]
#[https://www.usbr.gov/lc/region/g4000/24mo_MAX.pdf Probable Maximum 24-Month Study]

*[https://www.usbr.gov/uc/water/rsvrs/ops/monthly_summaries/index.html Monthly Summaries]
*[https://www.usbr.gov/uc/water/rsvrs/ops/aop/index.html Annual Operating Plans for Colorado River reservoirs]

== '''Snow Pack Reports''' ==
*[https://www.nrcs.usda.gov/Internet/WCIS/basinCharts/POR/WTEQ/assocHUC2/Upper%20Colorado%20Region.html Upper Colorado River Basin Snow Water Tracking]
*[https://www.usbr.gov/uc/water/hydrodata/status_maps/ Upper Colorado Basin Conditions Map]
*[http://www.usbr.gov/uc/water/notice/snowpack.html Bureau of Reclamation- Snow Pack Report]
*[http://www.cbrfc.noaa.gov/snow/station/sweplot/sweplot.cgi?quick=multiple SNOWTEL Report]
**The snowtel report is a calculating report, and takes approximately 3 minutes to run.
**Select the report under "Public", listed as "Colorado River above Lake Powell" (116 snowtel sites).
**Data source is updated at least daily.

== '''U.S. Drought Monitor''' ==

*[http://drought.unl.edu/DM/MONITOR.HTML U.S. Drought Monitor]
*[http://treeflow.info/basin.html Tree Flow Data]

==Inflow Volumes to Lake Powell and Release Volumes from Glen Canyon Dam==

[https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html 10-year average natural inflow (2015-2024)]: 12.60 maf <br>
[https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html 10-year average unregulated inflow (2016-2025)]: 8.06 maf <br>
[https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html 10-year average release (2016-2025)]: 8.30 maf <br>
[https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html 10-year average Lees Ferry Gage (2016-2025)]: 8.44 maf <br>

{| class="sortable wikitable" style="text-align:center;"
|-
!Water Year
![https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html Naturalized Flow at Lees Ferry (maf)]
![https://www.usbr.gov/uc/water/crsp/studies/index.html Unregulated Inflow (maf)]
![https://www.usbr.gov/uc/water/crsp/studies/index.html Release Volume (maf)]
![https://www.usbr.gov/uc/water/crsp/studies/index.html Lees Ferry Gage (maf)]

|-
|2026||03.40||03.72||06.000||~05.948||
|-
|2025||08.50||04.688||07.481||07.503||
|-
|2024||11.88||07.981||07.480||07.551||
|-
|2023||17.41||13.421||08.580||08.749||
|-
|2022||09.85||06.084||07.000||07.083||
|-
|2021||07.15||03.502||08.230||08.293||
|-
|2020||09.89||05.847||08.230||08.436||
|-
|2019||17.67||12.951||09.001||09.264||
|-
|2018||08.63|||04.612||09.000||09.171||
|-
|2017||16.40||11.905||09.000||09.170||
|-
|2016||13.44||09.616||09.000||09.138||
|-
|2015||13.41||10.174||09.000||09.157||
|-
|2014||13.98||10.381||07.480||07.590||
|-
|2013||09.11||05.117||08.232||08.289||
|-
|2012||08.50||04.908||09.466||09.542||
|-
|2011||20.16||15.971||12.518||12.753||
|-
|2010||12.32||08.426||08.235||08.437||
|-
|2009||14.27||10.220||08.236||08.406||
|-
|2008||16.21||12.086||08.978||09.180||
|-
|2007||12.56||08.754||08.231||08.421||
|-
|2006||12.61||08.626||08.228||08.507||
|-
|2005||16.89||12.795||08.232||08.395||
|-
|2004||09.59||05.913||08.231||08.348||
|-
|2003||10.53||06.161||08.229||08.372||
|-
|2002||05.93||02.643||08.230||08.347||
|-
|2001||11.04||06.994||08.236||08.361||
|-
|2000||10.56||06.936||09.381||09.529||
|-
|1999||16.43||12.800||11.204||11.430||
|-
|1998||16.97||13.520||13.510||13.440||
|-
|1997||21.15||17.053||13.824||13.874||
|-
|1996||14.07||10.402||11.522||11.532||
|-
|1995||19.80||15.905||09.223||09.242||
|-
|1994||10.64||06.794||08.289||08.304||
|-
|1993||18.63||14.437||08.102||08.137||
|-
|1992||11.10||07.352||08.002||08.023||
|-
|1991||12.35||08.801||08.121||08.131||
|-
|1990||09.00||05.311||08.140||08.151||
|-
|1989||09.60||05.939||07.981||07.994||
|-
|1988||11.68||07.989||08.144||08.160||
|-
|1987||16.61||13.377||13.429||13.450||
|-
|1986||22.36||18.546||16.848||16.866||
|-
|1985||21.06||17.517||19.094||19.109||
|-
|1984||24.18||20.846||20.499||20.518||
|-
|1983||23.70||20.371||17.493||17.520||
|-
|1982||16.67||12.771||08.304||08.323||
|-
|1981||08.68||05.639||08.295||08.316||
|-
|1980||17.27||13.682||10.907||10.950||
|-
|1979||17.55||14.189||08.297||08.333||
|-
|1978||14.85||11.059||08.354||08.369||
|-
|1977||05.52||03.529||08.260||08.269||
|-
|1976||11.21||08.431||08.482||08.494||
|-
|1975||16.53||13.095||09.255||09.274||
|-
|1974||12.96||09.970||08.266||08.277||
|-
|1973||19.14||15.974||10.108||10.141||
|-
|1972||12.44||09.329||09.311||09.330||
|-
|1971||14.73||11.798||08.591||08.607||
|-
|1970||15.06||11.992||08.692||08.688||
|-
|1969||14.45||11.520||08.823||08.850 ||
|-
|1968||13.34||10.319||08.334||08.358 ||
|-
|1967||11.71||08.979||07.797||07.824 ||
|-
|1966||11.06||08.689||07.854||07.870 ||
|-
|1965||18.36||15.046||10.820||10.835 ||
|-
|1964||10.38||07.492||02.413||02.427||

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[[File:Temp Precip Flows.png|center|600px]]

[[File:WaterUse.png|center|600px]]

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Stream Flow Gages</h2>
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*[http://graphs.water-data.com/lakepowell/ Lake Powell Water Level Graphs]
*[https://www.wapa.gov/regions/CRSP/OpsMaint/Pages/scada.aspx Glen Canyon Dam releases (SCADA)]
*[https://www.usbr.gov/lc/region/g4000/riverops/_HdbWebQuery.html Glen Canyon Dam releases (HDB), SDI for total release = 1872]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-GCLT1 Water Holes Canyon above the mouth]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09380000 Colorado River at Lees Ferry]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09381800 Paria River near Kanab, UT]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09382000 Paria River at Lees Ferry, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT1 Badger Creek below highway 89A near Vermillion Cliffs, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT2 Tanner Wash below highway 89A near Bitter Springs, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT3 House Rock Wash above Emmett Wash near Cliff Dwellers, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT5 North Canyon near Cliff Dwellers, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT6 Shinumo Wash in Twentynine Mile Canyon near Cedar Ridge, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09383050 Colorado River near river mile 30]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09383100 Colorado River above Little Colorado River near Desert View, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401260 Moenkopi Wash at Moenkopi, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401500 Moenkopi Wash near Cameron, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401000 Little Colorado River at Grand Falls, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402000 Little Colorado River near Cameron, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402300 Little Colorado River above the mouth near Desert View, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402500 Colorado River near Grand Canyon, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09403000 Bright Angel Creek near Grand Canyon, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT6 Shinumo Creek]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09403850 Kanab Creek above the mouth near Supai, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404115 Havasu Creek above the mouth near Supai, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404120 Colorado River above National Canyon near Supai, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404200 Colorado River above Diamond Creek near Peach Springs, AZ]
*[http://graphs.water-data.com/lakemead/ Lake Mead Water Level Graphs]

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Presentations and Papers</h2>
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'''2026'''
*[https://www.usbr.gov/uc/progact/amp/twg/2026-06-10-twg-meeting/uc-gcdamp-twg-basinhydrology-508-20260610.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2026-05-13-amwg-meeting/uc-gcdamp-amwg-basinhydrology-508-20260513.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/twg/2026-04-09-twg-meeting/uc-gcdamp-twg-basinhydrology-508-20260409.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/twg/2026-02-05-twg-meeting/uc-gcdamp-twg-basinhydrology-508-20260205.pdf Basin Hydrology and Operations]

'''2025'''
*[https://www.usbr.gov/uc/progact/amp/twg/2024-07-10-twg-meeting/20240710-BasinHydrologyOperations-508-AMWD.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/twg/2025-04-10-twg-meeting/uc-gcdamp-twg-basinhydrology-508-20250410.pdf Basin Hydrology and Operations]
*[[Media:Schmidt_Fleck_reservoir_storage.pdf|Colorado River Basin Reservoir Storage: where do we stand?]]

'''2024'''
*[https://www.usbr.gov/uc/progact/amp/twg/2024-10-30-twg-meeting/20241030-BasinHydrologyOperations-508-AMWQD.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2024-08-22-amwg-meeting/20240822-BasinHydrologyOperations-508-AMWQD.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2024-05-15-amwg-meeting/20240515-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2024-02-29-amwg-meeting/20240229-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2024-01-25-twg-meeting/20240125-TWGMeeting-UpperColoradoRiverBasinIRADroughtMitigationPrograms-508-UCRO.pdf Upper Colorado River Basin IRA Drought Mitigation Programs ]
*[https://www.usbr.gov/uc/progact/amp/twg/2024-01-25-twg-meeting/20240125-TWGMeeting-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://qcnr.usu.edu/coloradoriver/blog/WY2023-schmidt-4 Reservoir Storage at the End of 2023 – Holding On to What We Have]

'''2023'''
*[https://www.usbr.gov/uc/progact/amp/twg/2023-11-08-twg-meeting/20231108-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality]
*[https://www.usbr.gov/uc/progact/amp/amwg/2023-08-17-amwg-meeting/20230817-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-06-15-twg-meeting/20230615-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations, and Water Quality]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-04-13-twg-meeting/20230413-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2023-02-16-amwg-meeting/20230216-GlenCanyonDamOperationsUpperBasinHydrologyWaterQuality-508-UCRO.pdf Glen Canyon Dam Operations and Upper Basin Hydrology and Water Quality]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-01-26-twg-meeting/20230126-TWGMeeting-BasinHydrologyWaterQuality-508-UCRO.pdf Basin Hydrology and Water Quality]

'''2022'''
*[https://qcnr.usu.edu/coloradoriver/files/news/White-Paper-7.pdf Evaluating the Accuracy of Reclamation’s 24-Month Study Lake Powell Projections]
*[https://www.usbr.gov/uc/progact/amp/twg/2022-10-13-twg-meeting/20221013-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-08-18-amwg-meeting/20220818-Smith-AMWG-DROA-PPT_508.pdf AMP Role Relative to Implementing the Drought Response Operating Agreement]
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-08-18-amwg-meeting/20220818-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/twg/2022-06-16-twg-meeting/20220616-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-05-18-amwg-meeting/20220518-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2022-04-13-twg-meeting/20220413-BasinHydrologyOperationsWaterQuality-Presentation-508-UCRO.pdf Basin Hydrology, Operations, and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/twg/2022-01-13-twg-meeting/20220113-TWGMeeting-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-02-10-amwg-meeting/20220210-BasinHydrologyWaterQualityOperations-508-UCRO.pdf Basin Hydrology, Water Quality, and Operations ]

'''2021'''
*[https://www.usbr.gov/uc/progact/amp/twg/2021-10-14-twg-meeting/20211014-ColoradoRiverBasinAugust20215-yearProjectedFutureConditions-Presentation-508-UCRO.pdf Colorado River Basin August 2021 5-year Projected Future Conditions ]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-10-14-twg-meeting/20211014-Long-TermHydrologicProjectionsColoradoRiverBasinMethodsConsideringUncertainty-Presentation-508-UCRO.pdf Long-Term Hydrologic Projections for the Colorado River Basin and Methods for Considering Uncertainty]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-06-17-twg-meeting/20210617-ColoradoRiverBasinApril20215-yearProjectedFutureConditions-508-UCRO.pdf Colorado River Basin April 2021 5-year Projected Future Conditions ]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-06-17-twg-meeting/20210617-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2021-05-19-amwg-meeting/20210519-BasinHydrologyOperation-Presentation-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-04-14-twg-meeting/20210414-UpdateHydrologyOperationsWaterQualityConditions-508-UCRO.pdf Update on Hydrology, Operations and Water Quality Conditions ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2021-02-11-amwg-meeting/20210211-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-01-22-twg-meeting/20210122-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]

'''2020'''
*[https://www.usbr.gov/uc/progact/amp/twg/2020-10-15-twg-meeting/20201015-OpsHydrologyTWG-508.pdf TWG Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2020-08-20-amwg-meeting/20200820-BasinHydrologyReservoirOperations2020-2021Hydrograph-Presentation-508-UCRO.pdf Basin Hydrology, Reservoir Operations 2020 and 2021 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/twg/2020-06-24-twg-meeting/20200624-HydrologyOperationsReservoirRelease-508-UCRO.pdf Hydrology, Operations and Reservoir Release presentation ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2020-05-20-amwg-meeting/20200520-AMWG-HydrologyOperationsReservoirRelease-508-UCRO.pdf Hydrology, Operations and Reservoir Release presentation ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2020-02-12-amwg-meeting/20200212-AMWG-HydrologyOperationsReservoirRelease-Presentation-508-UCRO.pdf Hydrology, Operations and Reservoir Release]

'''2019'''
*[https://www.usbr.gov/uc/progact/amp/twg/2019-10-21-twg-meeting/20191021-BasinHydrologyReservoirOperations2020Hydrograph-Presentation-508-UCRO.pdf Basin Hydrology, Reservoir Operations and 2020 Hydrograph Presentation ]

'''2018'''
*[http://www.yumaheritage.com/docs/2nd-A-1JackSchmidt_USU_LoganUT.pdf?bcsi_scan_16614fa24ff8c4a5=0&bcsi_scan_filename=2nd-A-1JackSchmidt_USU_LoganUT.pdf Urban Waterfronts 2018]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-10-10-twg-meeting/Attach_06.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2018-08-22-amwg-meeting/Attach_02.pdf Basin Hydrology, Reservoir Operations 2018 and 2019 Hydrograph]
*[https://qcnr.usu.edu/wats/colorado_river_studies/files/documents/Udall.pdf How Will the Colorado Run? The Colorado River in a Warmer World]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-06-25-twg-meeting/Attach_04.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2018-05-22-amwg-meeting/Attach_02.pdf Basin Hydrology, Reservoir Operations 2018 and 2019 Hydrograph PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-04-23-twg-meeting/Attach_13.pdf The 21st Century Colorado River Hot Drought and Implications for the Future PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-04-23-twg-meeting/Attach_06.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2018-02-14-amwg-meeting/Attach_03.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-01-25-twg-meeting/AR21.pdf Basin Hydrology, Operations and 2018 Hydrograph PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-01-25-twg-meeting/Attach_04.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]

'''2017'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2017-02-15-amwg-meeting/Attach_16.pdf Analysis of Water Losses and Impacts to the Grand Canyon Ecosystem of the "Fill Mead First" Proposal]
*[https://qcnr.usu.edu/wats/colorado_river_studies/files/documents/Fill_Mead_First_Exec_Summary.pdf Fill Mead First: A technical assessment (Summary)]
*[https://qcnr.usu.edu/wats/colorado_river_studies/files/documents/Fill_Mead_First_Analysis.pdf Fill Mead First: A technical assessment (Analysis)]
*[https://www.usbr.gov/uc/progact/amp/twg/2017-04-20-twg-meeting/Attach_03.pdf Basin Hydrology and Operations]
*[[Media:Feb2017 OperationsCall.pdf| February 2017 Glen Canyon Montly Operational Coordination Call]]
*[https://www.usbr.gov/uc/progact/amp/amwg/2017-02-15-amwg-meeting/Attach_05.pdf Basin Hydrology, and 2017-2018 Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2017-02-15-amwg-meeting/Attach_16.pdf Analysis of Water Losses and Impacts to the Grand Canyon Ecosystem of the "Fill Mead First" Proposal and PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2017-01-26-twg-meeting/A6_Davidson.pdf Basin Hydrology, Operations and 2018 Hydrograph]

'''2016'''
*[[Media:Aug2016 Information.pdf| August 2016 DOI-DOE Federal Family call on Glen Canyon Operations ]]
*[https://qcnr.usu.edu/coloradoriver/news/wp1.php Fill Mead First – A Technical Assessment]
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-08-24-amwg-meeting/Attach_05.pdf Basin Hydrology and Water Year (WY) 2017 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-05-25-amwg-meeting/Attach_02.pdf Basin Hydrology, Operations, and 2017 Hydrograph]
*[[Media:2017 Hydrology PPT.pdf| TWG: Basin Hydrology, Operations, and 2017 Hydrograph]]
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-02-24-amwg-meeting/Attach_08.pdf Basin Hydrology, Operations, and 2017 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/Attach_03.pdf Glen Canyon Dam Operations During Equalization]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/AR01_Topping.pdf Project 2: Streamflow, Water Quality, Sediment Transport, and Sand Budgets in the Colorado River Ecosystem]

'''2015'''
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGMHhacTF4enJ1eGs/view 2016 Annual Operating Plan]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGTU41NkhzUi1ZTTg/view California Drought Monitor]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGOVVVUXFhZVBvNmM/view Lake Mead Issues and Lower Basin Shortage Preparedness]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGbDNmN3FOeW05b3c/view Lake Mead Issues and Lower Basin Shortage Preparedness - Presentation]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGbmRuSzRqVm5ydHc/view Basin Hydrology Operations, and 2016 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-06-11-twg-meeting/Attach_04.pdf Basin Hydrology Operations, and 2016 Hydrograph]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGMHhacTF4enJ1eGs/view 2016 Annual Operating Plan]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-05-28-amwg-meeting/Attach_05.pdf Basin Hydrology and WY 2016 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-04-21-twg-meeting/Attach_03.pdf Hydrology Update and 2016 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-04-21-twg-meeting/Attach_07.pdf Water Quality in Lake Mead and Upstream Influences: Dissolved Oxygen during 2014]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_02.pdf Basin Hydrology, Operations, and 2016 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03a.pdf Panel on Current Projects and Issues in Utah]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03b.pdf Central Utah Project]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03c.pdf Meeting the Mitigation Requirement for the Bonneville Unit CUP]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03d.pdf Current Projects and Issues in Utah]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03e.pdf Provo Area Office]

'''2014'''
*[https://www.usbr.gov/uc/progact/amp/twg/2014-10-28-twg-meeting/Attach_09.pdf Colorado River Annual Operating Plan and Drought Contingency Planning ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-08-27-amwg-meeting/Attach_02b.pdf DOI-DOE Hydrograph Development for Water Year 2015 ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-08-27-amwg-meeting/Attach_02a.pdf Basin Hydrology, Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2014-06-24-twg-meeting/Attach_06a.pdf Basin Hydrology, Operations, and 2015 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-05-27-amwg-meeting/Attach_01.pdf Basin Hydrology, Operations, and 2015 Hydrograph and AIF: Development of Water Year 2015 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-02-19-amwg-meeting/Attach_02.pdf Basin Hydrology, Operations, and 2015 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-02-19-amwg-meeting/Attach_03a.pdf Panel on the Potential Effects of Long-Term Drought on Colorado River Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-02-19-amwg-meeting/Attach_03b.pdf Near Term Risks: Options to Address Declining Reservoirs ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-02-19-amwg-meeting/Attach_03c.pdf State of Nevada Concerns ]

'''2013'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-08-08-amwg-meeting/Attach_04.pdf Water Year 2014 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-08-08-amwg-meeting/Attach_03.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-06-26-twg-meeting/Attach_04.pdf Colorado River Basin Hydrology and Projected Glen Canyon Dam Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-06-26-twg-meeting/Attach_05a.pdf DOI/DOE FY14 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-06-26-twg-meeting/Attach_05b.pdf Approved FY14 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-02-20-amwg-meeting/Attach_04.pdf Glen Canyon Dam Facility Management]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-02-20-amwg-meeting/Attach_02.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-02-20-amwg-meeting/Attach_03.pdf Colorado River Basin Water Supply and Demand Study]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-01-24-twg-meeting/Attach_05.pdf Executive Summary--Pre-Production Copy of the Colorado River Basin Water Supply and Demand Study]
*[https://www.usbr.gov/lc/region/programs/crbstudy/finalreport/index.html Colorado River Basin Water Study & Demand Study - Final Study Reports]

'''2012'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-08-29-amwg-meeting/Attach_03.pdf Basin Hydrology ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-08-29-amwg-meeting/Attach_06a.pdf Water Year 2013 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-08-29-amwg-meeting/Attach_06b.pdf TWG Report: 2013 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/twg/2012-06-20-twg-meeting/Attach_04a.pdf DOI and DOE Operating Hydrograph Recommendations for GCD (2012 water year)]
*[https://www.usbr.gov/uc/progact/amp/twg/2012-06-20-twg-meeting/Attach_04b.pdf Water Year 2013 Hydrograph TWG Motion ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Attach_05.pdf 2013 Hydrograph Development ]
*[https://www.usbr.gov/uc/progact/amp/twg/2012-02-02-twg-meeting/Attach_07.pdf FY2013 Hydrograph (from 8/2011 AMWG meeting)]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Attach_09.pdf Basin Hydrology and Operations ]
*[https://www.gcmrc.gov/about/ka/KA%202%20-%2010-19-11/AM%20Talks/Grams%20Flow%20Temp%20Turbidity.pdf Flow Temp Turbidity ]

'''2011'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-08-24-amwg-meeting/Attach_09.pdf 2012 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-08-24-amwg-meeting/Attach_08.pdf Basin Hydrology ]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-06-28-twg-meeting/Attach_06a.pdf 2012 Hydrograph Development ]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-06-28-twg-meeting/Attach_06b.pdf Department of the Interior and Department of Energy Operating Hydrograph Recommendations for Glen Canyon Dam (2012 Water Year), June 6, 2011]
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-05-18-amwg-meeting/Attach_03.pdf Basin Hydrology ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-05-18-amwg-meeting/Attach_10.pdf Secure Water Act Section 9503 (c) - Water and Climate Change]
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-05-18-amwg-meeting/Attach_04.pdf WY2012 Hydrograph Development ]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-03-08-twg-meeting/Attach_05a.pdf 2012 Hydrograph Development ]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-03-08-twg-meeting/Attach_05b.pdf Grand Canyon Trust Proposed FY2012 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-01-20-twg-meeting/Attach_04a.pdf Bureau of Reclamation Updates ]

'''2010'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07a.pdf Fiscal Year 2011-12 Hydrograph and E-mail Message to the AMWG from Anne Castle Dated July 23, 2010, Subject: July 23 Final Draft DOI-DOE Proposed Hydrograph Recommendations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07b.pdf Department of the Interior and Department of the Energy Recommendations for Glen Canyon Dam with August 23, 2010, edits]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07c.pdf Grand Canyon Protection Act]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07d.pdf Report on Modeling the 2008-2010 Period to Support Development of the 2011 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07e.pdf Proposed Water year 2011 Hydrograph: Impacts on CRSP Electric Power Resources]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07f.pdf Grand Canyon Trust Hydrograph Proposal]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_06.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-02-03-amwg-meeting/Attach_12.pdf Basin Hydrology and PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2010-01-21-twg-meeting/Attach_03b.pdf Figure 1, AOP, BOR, AMWG monthly volumes]

'''2009'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-08-12-amwg-meeting/Attach_08a.pdf FY2010-11 Draft Budget, Workplan, and Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-08-12-amwg-meeting/Attach_08b.pdf Basin Hydrology PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-04-29-amwg-meeting/Attach_11.pdf Basin Hydrology and PPT]

*[http://www.riversimulator.org/Resources/AquaticResearch/MLFFfailureKorman2004.pdf ***DRAFT*** Evidence for the Failure of the Modified Low Fluctuating Flow Alternative (MLFFA) to Benefit Most Ecological Resources in Grand Canyon ]
*[https://pubs.usgs.gov/of/2006/1243/pdf/of06-1243_508.pdf Hazel et al. 2006. Stage-Discharge Relations for the Colorado River in Glen, Marble, and Grand Canyons, Arizona: U.S. Geological Survey Open-File Report 2006-1243, 7 p]
*[https://pubs.usgs.gov/pp/pp1677/pdf/pp1677.pdf Topping et al. 2003. Computation and analysis of the instantaneous-discharge record for the Colorado River at Lees Ferry, Arizona, May 8, 1921 through September 30, 2000: U.S. Geological Survey Professional Paper 1677, 118 p.]

|-
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Other Stuff</h2>
|-
|style="color:#000;"|

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<Span></Span>

Hydrology

2026-10-14T15:14:48Z

Cellsworth:

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[[File:Hydrology.jpg|center|300px]]


|style="width:60%; font-size:120%;"|

=='''Upper Colorado River Basin Hydrology'''==
Upper Colorado River Basin regularly experiences significant year to year hydrologic variability. During the 21-year period 2000 to 2020, however, the unregulated inflow to Lake Powell, which is a good measure of hydrologic conditions in the Colorado River Basin, was above average in only 4 out of the past 19 years. The period 2000-2020 is the lowest 21-year period since the closure of Glen Canyon Dam in 1963, with an average unregulated inflow of 8.62 maf, or 80 percent of the 30-year average (1981-2010). (For comparison, the 1981-2010 total water year average is 10.83 maf.) The unregulated inflow during the 2000-2020 period has ranged from a low of 2.64 maf (24 percent of average) in water year 2002 to a high of 15.97 maf (147 percent of average) in water year 2011. In water year 2018 unregulated inflow volume to Lake Powell was 4.6 maf (43 percent of average), the third driest year on record above 2002 and 1977. [http://www.usbr.gov/uc/water/crsp/cs/gcd.html]

|}
{| style="width:100%; height:50px" border=1px solid #ccc; background:#cedff2
! style="width=33%; background:#cedff2;" | [http://www.usbr.gov/uc/water/crsp/cs/gcd.html Current Status] <br>
! style="width=33%; background:#cedff2;" | [http://www.usbr.gov/uc/water/crsp/cs/gcd.html Current Operations] <br>
! style="width=33%; background:#cedff2;" | [http://www.usbr.gov/uc/water/crsp/cs/gcd.html Inflow Forecasts and Model Projections] <br>
|}

{|style="margin:0px 0px 0px 0px; background:none;"
|class="MainPageBG" style="width:55%; border:1px solid #cef2e0; background:#f5faff; vertical-align:top; color:#000;"|
{|width="100%" cellpadding="2" cellspacing="5" style="vertical-align:top; background:#f5faff;"
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; text-align:left; color:#000; padding:0.2em 0.4em;">Updates</h2>
|-
|style="color:#000;"|

=='''[https://www.usbr.gov/uc/index.html Upper Colorado Region Homepage]'''==
*[https://www.usbr.gov/uc/water/hydrodata/reservoir_data/919/dashboard.html Hydrodata dashboard for Lake Powell]
*[https://www.nrcs.usda.gov/Internet/WCIS/basinCharts/POR/WTEQ/assocHUC2/Upper%20Colorado%20Region.html Lake Powell Snow Chart]
*[https://www.usbr.gov/uc/water/crsp/studies/images/PowellForecast.png Lake Powell Inflow Forecast]
*[https://www.usbr.gov/uc/water/crsp/studies/images/PowellElevations.png Lake Powell Elevation Projections]
*[https://www.usbr.gov/uc/water/crsp/studies/images/PowellRelease.png Lake Powell Release Projections]
*[https://www.usbr.gov/uc/water/crsp/cs/gcd.html Glen Canyon Dam Operations]

== '''USBR Weekly Water Reports''' ==
*[https://www.usbr.gov/uc/water/rsvrs/ops/WeeklyHydrologySummary/Weekly_Hydro.pdf Upper Colorado Region Weekly Hydrology Summary]
#Reservoir inflows (forecast and observed)
#Reservoir releases
#SNOTEL

*[http://www.usbr.gov/lc/region/g4000/weekly.pdf Lower Colorado Water Supply Report]
#Water use

*[http://www.usbr.gov/lc/region/g4000/wtracct.html Lower Colorado River Water Accounting]
*[https://www.usbr.gov/uc/water/basin/index.html Colorado River Basin Tea-Cup Diagrams]

== '''USBR Monthly/Annual Reports''' ==
*[https://www.usbr.gov/uc/water/crsp/studies/index.html 24-Month Studies]

#[https://www.usbr.gov/lc/region/g4000/24mo.pdf Most Probable 24-Month Study]
#[https://www.usbr.gov/lc/region/g4000/24mo_MIN.pdf Probable Minimum 24-Month Study]
#[https://www.usbr.gov/lc/region/g4000/24mo_MAX.pdf Probable Maximum 24-Month Study]

*[https://www.usbr.gov/uc/water/rsvrs/ops/monthly_summaries/index.html Monthly Summaries]
*[https://www.usbr.gov/uc/water/rsvrs/ops/aop/index.html Annual Operating Plans for Colorado River reservoirs]

== '''Snow Pack Reports''' ==
*[https://www.nrcs.usda.gov/Internet/WCIS/basinCharts/POR/WTEQ/assocHUC2/Upper%20Colorado%20Region.html Upper Colorado River Basin Snow Water Tracking]
*[https://www.usbr.gov/uc/water/hydrodata/status_maps/ Upper Colorado Basin Conditions Map]
*[http://www.usbr.gov/uc/water/notice/snowpack.html Bureau of Reclamation- Snow Pack Report]
*[http://www.cbrfc.noaa.gov/snow/station/sweplot/sweplot.cgi?quick=multiple SNOWTEL Report]
**The snowtel report is a calculating report, and takes approximately 3 minutes to run.
**Select the report under "Public", listed as "Colorado River above Lake Powell" (116 snowtel sites).
**Data source is updated at least daily.

== '''U.S. Drought Monitor''' ==

*[http://drought.unl.edu/DM/MONITOR.HTML U.S. Drought Monitor]
*[http://treeflow.info/basin.html Tree Flow Data]

==Inflow Volumes to Lake Powell and Release Volumes from Glen Canyon Dam==

[https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html 10-year average natural inflow (2015-2024)]: 12.60 maf <br>
[https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html 10-year average unregulated inflow (2016-2025)]: 8.06 maf <br>
[https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html 10-year average release (2016-2025)]: 8.30 maf <br>
[https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html 10-year average Lees Ferry Gage (2016-2025)]: 8.44 maf <br>

{| class="sortable wikitable" style="text-align:center;"
|-
!Water Year
![https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html Naturalized Flow at Lees Ferry (maf)]
![https://www.usbr.gov/uc/water/crsp/studies/index.html Unregulated Inflow (maf)]
![https://www.usbr.gov/uc/water/crsp/studies/index.html Release Volume (maf)]
![https://www.usbr.gov/uc/water/crsp/studies/index.html Lees Ferry Gage (maf)]

|-
|2026||03.40||03.72||06.000||~05.948||
|-
|2025||08.50||04.688||07.481||07.503||
|-
|2024||11.88||07.981||07.480||07.551||
|-
|2023||17.41||13.421||08.580||08.749||
|-
|2022||09.85||06.084||07.000||07.083||
|-
|2021||07.15||03.502||08.230||08.293||
|-
|2020||09.89||05.847||08.230||08.436||
|-
|2019||17.67||12.951||09.001||09.264||
|-
|2018||08.63|||04.612||09.000||09.171||
|-
|2017||16.40||11.905||09.000||09.170||
|-
|2016||13.44||09.616||09.000||09.138||
|-
|2015||13.41||10.174||09.000||09.157||
|-
|2014||13.98||10.381||07.480||07.590||
|-
|2013||09.11||05.117||08.232||08.289||
|-
|2012||08.50||04.908||09.466||09.542||
|-
|2011||20.16||15.971||12.518||12.753||
|-
|2010||12.32||08.426||08.235||08.437||
|-
|2009||14.27||10.220||08.236||08.406||
|-
|2008||16.21||12.086||08.978||09.180||
|-
|2007||12.56||08.754||08.231||08.421||
|-
|2006||12.61||08.626||08.228||08.507||
|-
|2005||16.89||12.795||08.232||08.395||
|-
|2004||09.59||05.913||08.231||08.348||
|-
|2003||10.53||06.161||08.229||08.372||
|-
|2002||05.93||02.643||08.230||08.347||
|-
|2001||11.04||06.994||08.236||08.361||
|-
|2000||10.56||06.936||09.381||09.529||
|-
|1999||16.43||12.800||11.204||11.430||
|-
|1998||16.97||13.520||13.510||13.440||
|-
|1997||21.15||17.053||13.824||13.874||
|-
|1996||14.07||10.402||11.522||11.532||
|-
|1995||19.80||15.905||09.223||09.242||
|-
|1994||10.64||06.794||08.289||08.304||
|-
|1993||18.63||14.437||08.102||08.137||
|-
|1992||11.10||07.352||08.002||08.023||
|-
|1991||12.35||08.801||08.121||08.131||
|-
|1990||09.00||05.311||08.140||08.151||
|-
|1989||09.60||05.939||07.981||07.994||
|-
|1988||11.68||07.989||08.144||08.160||
|-
|1987||16.61||13.377||13.429||13.450||
|-
|1986||22.36||18.546||16.848||16.866||
|-
|1985||21.06||17.517||19.094||19.109||
|-
|1984||24.18||20.846||20.499||20.518||
|-
|1983||23.70||20.371||17.493||17.520||
|-
|1982||16.67||12.771||08.304||08.323||
|-
|1981||08.68||05.639||08.295||08.316||
|-
|1980||17.27||13.682||10.907||10.950||
|-
|1979||17.55||14.189||08.297||08.333||
|-
|1978||14.85||11.059||08.354||08.369||
|-
|1977||05.52||03.529||08.260||08.269||
|-
|1976||11.21||08.431||08.482||08.494||
|-
|1975||16.53||13.095||09.255||09.274||
|-
|1974||12.96||09.970||08.266||08.277||
|-
|1973||19.14||15.974||10.108||10.141||
|-
|1972||12.44||09.329||09.311||09.330||
|-
|1971||14.73||11.798||08.591||08.607||
|-
|1970||15.06||11.992||08.692||08.688||
|-
|1969||14.45||11.520||08.823||08.850 ||
|-
|1968||13.34||10.319||08.334||08.358 ||
|-
|1967||11.71||08.979||07.797||07.824 ||
|-
|1966||11.06||08.689||07.854||07.870 ||
|-
|1965||18.36||15.046||10.820||10.835 ||
|-
|1964||10.38||07.492||02.413||02.427||

|}

[[File:LakePowellInflows1906 2012.JPG|left|500px|thumbnail|[https://usea.org/sites/default/files/event-/Final_Colorado_Overview.pdf https://usea.org/sites/default/files/event-/Final_Colorado_Overview.pdf] ]]

[[File:GlenCanyonRelease1995 2015.JPG|left|500px|thumbnail|[http://www.lakepowell.org/page_two/what_s_new/what_s_new.html http://www.lakepowell.org/page_two/what_s_new/what_s_new.html] ]]

[[File:LakePowellelevations1963 2012.JPG|left|500px|thumbnail|[https://www.hcn.org/blogs/goat/is-lake-powell-really-shrinking https://www.hcn.org/blogs/goat/is-lake-powell-really-shrinking] ]]

|}


|class="MainPageBG" style="width:45%; border:1px solid #cedff2; background:#f5faff; vertical-align:top;"|
{| width="100%" cellpadding="2" cellspacing="5" style="vertical-align:top; background:#f5faff;"
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Stream Flow Gages</h2>
|-
|style="color:#000;"|

*[http://graphs.water-data.com/lakepowell/ Lake Powell Water Level Graphs]
*[https://www.wapa.gov/regions/CRSP/OpsMaint/Pages/scada.aspx Glen Canyon Dam releases (SCADA)]
*[https://www.usbr.gov/lc/region/g4000/riverops/_HdbWebQuery.html Glen Canyon Dam releases (HDB), SDI for total release = 1872]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-GCLT1 Water Holes Canyon above the mouth]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09380000 Colorado River at Lees Ferry]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09381800 Paria River near Kanab, UT]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09382000 Paria River at Lees Ferry, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT1 Badger Creek below highway 89A near Vermillion Cliffs, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT2 Tanner Wash below highway 89A near Bitter Springs, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT3 House Rock Wash above Emmett Wash near Cliff Dwellers, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT5 North Canyon near Cliff Dwellers, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT6 Shinumo Wash in Twentynine Mile Canyon near Cedar Ridge, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09383050 Colorado River near river mile 30]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09383100 Colorado River above Little Colorado River near Desert View, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401260 Moenkopi Wash at Moenkopi, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401500 Moenkopi Wash near Cameron, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401000 Little Colorado River at Grand Falls, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402000 Little Colorado River near Cameron, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402300 Little Colorado River above the mouth near Desert View, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402500 Colorado River near Grand Canyon, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09403000 Bright Angel Creek near Grand Canyon, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT6 Shinumo Creek]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09403850 Kanab Creek above the mouth near Supai, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404115 Havasu Creek above the mouth near Supai, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404120 Colorado River above National Canyon near Supai, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404200 Colorado River above Diamond Creek near Peach Springs, AZ]
*[http://graphs.water-data.com/lakemead/ Lake Mead Water Level Graphs]

|-
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Presentations and Papers</h2>
|-
|style="color:#000;"|

'''2026'''
*[https://www.usbr.gov/uc/progact/amp/twg/2026-06-10-twg-meeting/uc-gcdamp-twg-basinhydrology-508-20260610.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2026-05-13-amwg-meeting/uc-gcdamp-amwg-basinhydrology-508-20260513.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/twg/2026-04-09-twg-meeting/uc-gcdamp-twg-basinhydrology-508-20260409.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/twg/2026-02-05-twg-meeting/uc-gcdamp-twg-basinhydrology-508-20260205.pdf Basin Hydrology and Operations]

'''2025'''
*[https://www.usbr.gov/uc/progact/amp/twg/2024-07-10-twg-meeting/20240710-BasinHydrologyOperations-508-AMWD.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/twg/2025-04-10-twg-meeting/uc-gcdamp-twg-basinhydrology-508-20250410.pdf Basin Hydrology and Operations]
*[[Media:Schmidt_Fleck_reservoir_storage.pdf|Colorado River Basin Reservoir Storage: where do we stand?]]

'''2024'''
*[https://www.usbr.gov/uc/progact/amp/twg/2024-10-30-twg-meeting/20241030-BasinHydrologyOperations-508-AMWQD.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2024-08-22-amwg-meeting/20240822-BasinHydrologyOperations-508-AMWQD.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2024-05-15-amwg-meeting/20240515-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2024-02-29-amwg-meeting/20240229-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2024-01-25-twg-meeting/20240125-TWGMeeting-UpperColoradoRiverBasinIRADroughtMitigationPrograms-508-UCRO.pdf Upper Colorado River Basin IRA Drought Mitigation Programs ]
*[https://www.usbr.gov/uc/progact/amp/twg/2024-01-25-twg-meeting/20240125-TWGMeeting-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://qcnr.usu.edu/coloradoriver/blog/WY2023-schmidt-4 Reservoir Storage at the End of 2023 – Holding On to What We Have]

'''2023'''
*[https://www.usbr.gov/uc/progact/amp/twg/2023-11-08-twg-meeting/20231108-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality]
*[https://www.usbr.gov/uc/progact/amp/amwg/2023-08-17-amwg-meeting/20230817-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-06-15-twg-meeting/20230615-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations, and Water Quality]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-04-13-twg-meeting/20230413-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2023-02-16-amwg-meeting/20230216-GlenCanyonDamOperationsUpperBasinHydrologyWaterQuality-508-UCRO.pdf Glen Canyon Dam Operations and Upper Basin Hydrology and Water Quality]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-01-26-twg-meeting/20230126-TWGMeeting-BasinHydrologyWaterQuality-508-UCRO.pdf Basin Hydrology and Water Quality]

'''2022'''
*[https://qcnr.usu.edu/coloradoriver/files/news/White-Paper-7.pdf Evaluating the Accuracy of Reclamation’s 24-Month Study Lake Powell Projections]
*[https://www.usbr.gov/uc/progact/amp/twg/2022-10-13-twg-meeting/20221013-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-08-18-amwg-meeting/20220818-Smith-AMWG-DROA-PPT_508.pdf AMP Role Relative to Implementing the Drought Response Operating Agreement]
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-08-18-amwg-meeting/20220818-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/twg/2022-06-16-twg-meeting/20220616-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-05-18-amwg-meeting/20220518-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2022-04-13-twg-meeting/20220413-BasinHydrologyOperationsWaterQuality-Presentation-508-UCRO.pdf Basin Hydrology, Operations, and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/twg/2022-01-13-twg-meeting/20220113-TWGMeeting-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-02-10-amwg-meeting/20220210-BasinHydrologyWaterQualityOperations-508-UCRO.pdf Basin Hydrology, Water Quality, and Operations ]

'''2021'''
*[https://www.usbr.gov/uc/progact/amp/twg/2021-10-14-twg-meeting/20211014-ColoradoRiverBasinAugust20215-yearProjectedFutureConditions-Presentation-508-UCRO.pdf Colorado River Basin August 2021 5-year Projected Future Conditions ]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-10-14-twg-meeting/20211014-Long-TermHydrologicProjectionsColoradoRiverBasinMethodsConsideringUncertainty-Presentation-508-UCRO.pdf Long-Term Hydrologic Projections for the Colorado River Basin and Methods for Considering Uncertainty]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-06-17-twg-meeting/20210617-ColoradoRiverBasinApril20215-yearProjectedFutureConditions-508-UCRO.pdf Colorado River Basin April 2021 5-year Projected Future Conditions ]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-06-17-twg-meeting/20210617-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2021-05-19-amwg-meeting/20210519-BasinHydrologyOperation-Presentation-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-04-14-twg-meeting/20210414-UpdateHydrologyOperationsWaterQualityConditions-508-UCRO.pdf Update on Hydrology, Operations and Water Quality Conditions ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2021-02-11-amwg-meeting/20210211-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-01-22-twg-meeting/20210122-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]

'''2020'''
*[https://www.usbr.gov/uc/progact/amp/twg/2020-10-15-twg-meeting/20201015-OpsHydrologyTWG-508.pdf TWG Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2020-08-20-amwg-meeting/20200820-BasinHydrologyReservoirOperations2020-2021Hydrograph-Presentation-508-UCRO.pdf Basin Hydrology, Reservoir Operations 2020 and 2021 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/twg/2020-06-24-twg-meeting/20200624-HydrologyOperationsReservoirRelease-508-UCRO.pdf Hydrology, Operations and Reservoir Release presentation ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2020-05-20-amwg-meeting/20200520-AMWG-HydrologyOperationsReservoirRelease-508-UCRO.pdf Hydrology, Operations and Reservoir Release presentation ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2020-02-12-amwg-meeting/20200212-AMWG-HydrologyOperationsReservoirRelease-Presentation-508-UCRO.pdf Hydrology, Operations and Reservoir Release]

'''2019'''
*[https://www.usbr.gov/uc/progact/amp/twg/2019-10-21-twg-meeting/20191021-BasinHydrologyReservoirOperations2020Hydrograph-Presentation-508-UCRO.pdf Basin Hydrology, Reservoir Operations and 2020 Hydrograph Presentation ]

'''2018'''
*[http://www.yumaheritage.com/docs/2nd-A-1JackSchmidt_USU_LoganUT.pdf?bcsi_scan_16614fa24ff8c4a5=0&bcsi_scan_filename=2nd-A-1JackSchmidt_USU_LoganUT.pdf Urban Waterfronts 2018]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-10-10-twg-meeting/Attach_06.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2018-08-22-amwg-meeting/Attach_02.pdf Basin Hydrology, Reservoir Operations 2018 and 2019 Hydrograph]
*[https://qcnr.usu.edu/wats/colorado_river_studies/files/documents/Udall.pdf How Will the Colorado Run? The Colorado River in a Warmer World]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-06-25-twg-meeting/Attach_04.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2018-05-22-amwg-meeting/Attach_02.pdf Basin Hydrology, Reservoir Operations 2018 and 2019 Hydrograph PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-04-23-twg-meeting/Attach_13.pdf The 21st Century Colorado River Hot Drought and Implications for the Future PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-04-23-twg-meeting/Attach_06.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2018-02-14-amwg-meeting/Attach_03.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-01-25-twg-meeting/AR21.pdf Basin Hydrology, Operations and 2018 Hydrograph PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-01-25-twg-meeting/Attach_04.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]

'''2017'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2017-02-15-amwg-meeting/Attach_16.pdf Analysis of Water Losses and Impacts to the Grand Canyon Ecosystem of the "Fill Mead First" Proposal]
*[https://qcnr.usu.edu/wats/colorado_river_studies/files/documents/Fill_Mead_First_Exec_Summary.pdf Fill Mead First: A technical assessment (Summary)]
*[https://qcnr.usu.edu/wats/colorado_river_studies/files/documents/Fill_Mead_First_Analysis.pdf Fill Mead First: A technical assessment (Analysis)]
*[https://www.usbr.gov/uc/progact/amp/twg/2017-04-20-twg-meeting/Attach_03.pdf Basin Hydrology and Operations]
*[[Media:Feb2017 OperationsCall.pdf| February 2017 Glen Canyon Montly Operational Coordination Call]]
*[https://www.usbr.gov/uc/progact/amp/amwg/2017-02-15-amwg-meeting/Attach_05.pdf Basin Hydrology, and 2017-2018 Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2017-02-15-amwg-meeting/Attach_16.pdf Analysis of Water Losses and Impacts to the Grand Canyon Ecosystem of the "Fill Mead First" Proposal and PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2017-01-26-twg-meeting/A6_Davidson.pdf Basin Hydrology, Operations and 2018 Hydrograph]

'''2016'''
*[[Media:Aug2016 Information.pdf| August 2016 DOI-DOE Federal Family call on Glen Canyon Operations ]]
*[https://qcnr.usu.edu/coloradoriver/news/wp1.php Fill Mead First – A Technical Assessment]
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-08-24-amwg-meeting/Attach_05.pdf Basin Hydrology and Water Year (WY) 2017 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-05-25-amwg-meeting/Attach_02.pdf Basin Hydrology, Operations, and 2017 Hydrograph]
*[[Media:2017 Hydrology PPT.pdf| TWG: Basin Hydrology, Operations, and 2017 Hydrograph]]
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-02-24-amwg-meeting/Attach_08.pdf Basin Hydrology, Operations, and 2017 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/Attach_03.pdf Glen Canyon Dam Operations During Equalization]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/AR01_Topping.pdf Project 2: Streamflow, Water Quality, Sediment Transport, and Sand Budgets in the Colorado River Ecosystem]

'''2015'''
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGMHhacTF4enJ1eGs/view 2016 Annual Operating Plan]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGTU41NkhzUi1ZTTg/view California Drought Monitor]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGOVVVUXFhZVBvNmM/view Lake Mead Issues and Lower Basin Shortage Preparedness]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGbDNmN3FOeW05b3c/view Lake Mead Issues and Lower Basin Shortage Preparedness - Presentation]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGbmRuSzRqVm5ydHc/view Basin Hydrology Operations, and 2016 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-06-11-twg-meeting/Attach_04.pdf Basin Hydrology Operations, and 2016 Hydrograph]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGMHhacTF4enJ1eGs/view 2016 Annual Operating Plan]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-05-28-amwg-meeting/Attach_05.pdf Basin Hydrology and WY 2016 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-04-21-twg-meeting/Attach_03.pdf Hydrology Update and 2016 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-04-21-twg-meeting/Attach_07.pdf Water Quality in Lake Mead and Upstream Influences: Dissolved Oxygen during 2014]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_02.pdf Basin Hydrology, Operations, and 2016 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03a.pdf Panel on Current Projects and Issues in Utah]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03b.pdf Central Utah Project]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03c.pdf Meeting the Mitigation Requirement for the Bonneville Unit CUP]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03d.pdf Current Projects and Issues in Utah]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03e.pdf Provo Area Office]

'''2014'''
*[https://www.usbr.gov/uc/progact/amp/twg/2014-10-28-twg-meeting/Attach_09.pdf Colorado River Annual Operating Plan and Drought Contingency Planning ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-08-27-amwg-meeting/Attach_02b.pdf DOI-DOE Hydrograph Development for Water Year 2015 ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-08-27-amwg-meeting/Attach_02a.pdf Basin Hydrology, Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2014-06-24-twg-meeting/Attach_06a.pdf Basin Hydrology, Operations, and 2015 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-05-27-amwg-meeting/Attach_01.pdf Basin Hydrology, Operations, and 2015 Hydrograph and AIF: Development of Water Year 2015 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-02-19-amwg-meeting/Attach_02.pdf Basin Hydrology, Operations, and 2015 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-02-19-amwg-meeting/Attach_03a.pdf Panel on the Potential Effects of Long-Term Drought on Colorado River Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-02-19-amwg-meeting/Attach_03b.pdf Near Term Risks: Options to Address Declining Reservoirs ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-02-19-amwg-meeting/Attach_03c.pdf State of Nevada Concerns ]

'''2013'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-08-08-amwg-meeting/Attach_04.pdf Water Year 2014 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-08-08-amwg-meeting/Attach_03.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-06-26-twg-meeting/Attach_04.pdf Colorado River Basin Hydrology and Projected Glen Canyon Dam Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-06-26-twg-meeting/Attach_05a.pdf DOI/DOE FY14 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-06-26-twg-meeting/Attach_05b.pdf Approved FY14 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-02-20-amwg-meeting/Attach_04.pdf Glen Canyon Dam Facility Management]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-02-20-amwg-meeting/Attach_02.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-02-20-amwg-meeting/Attach_03.pdf Colorado River Basin Water Supply and Demand Study]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-01-24-twg-meeting/Attach_05.pdf Executive Summary--Pre-Production Copy of the Colorado River Basin Water Supply and Demand Study]
*[https://www.usbr.gov/lc/region/programs/crbstudy/finalreport/index.html Colorado River Basin Water Study & Demand Study - Final Study Reports]

'''2012'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-08-29-amwg-meeting/Attach_03.pdf Basin Hydrology ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-08-29-amwg-meeting/Attach_06a.pdf Water Year 2013 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-08-29-amwg-meeting/Attach_06b.pdf TWG Report: 2013 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/twg/2012-06-20-twg-meeting/Attach_04a.pdf DOI and DOE Operating Hydrograph Recommendations for GCD (2012 water year)]
*[https://www.usbr.gov/uc/progact/amp/twg/2012-06-20-twg-meeting/Attach_04b.pdf Water Year 2013 Hydrograph TWG Motion ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Attach_05.pdf 2013 Hydrograph Development ]
*[https://www.usbr.gov/uc/progact/amp/twg/2012-02-02-twg-meeting/Attach_07.pdf FY2013 Hydrograph (from 8/2011 AMWG meeting)]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Attach_09.pdf Basin Hydrology and Operations ]
*[https://www.gcmrc.gov/about/ka/KA%202%20-%2010-19-11/AM%20Talks/Grams%20Flow%20Temp%20Turbidity.pdf Flow Temp Turbidity ]

'''2011'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-08-24-amwg-meeting/Attach_09.pdf 2012 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-08-24-amwg-meeting/Attach_08.pdf Basin Hydrology ]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-06-28-twg-meeting/Attach_06a.pdf 2012 Hydrograph Development ]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-06-28-twg-meeting/Attach_06b.pdf Department of the Interior and Department of Energy Operating Hydrograph Recommendations for Glen Canyon Dam (2012 Water Year), June 6, 2011]
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-05-18-amwg-meeting/Attach_03.pdf Basin Hydrology ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-05-18-amwg-meeting/Attach_10.pdf Secure Water Act Section 9503 (c) - Water and Climate Change]
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-05-18-amwg-meeting/Attach_04.pdf WY2012 Hydrograph Development ]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-03-08-twg-meeting/Attach_05a.pdf 2012 Hydrograph Development ]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-03-08-twg-meeting/Attach_05b.pdf Grand Canyon Trust Proposed FY2012 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-01-20-twg-meeting/Attach_04a.pdf Bureau of Reclamation Updates ]

'''2010'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07a.pdf Fiscal Year 2011-12 Hydrograph and E-mail Message to the AMWG from Anne Castle Dated July 23, 2010, Subject: July 23 Final Draft DOI-DOE Proposed Hydrograph Recommendations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07b.pdf Department of the Interior and Department of the Energy Recommendations for Glen Canyon Dam with August 23, 2010, edits]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07c.pdf Grand Canyon Protection Act]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07d.pdf Report on Modeling the 2008-2010 Period to Support Development of the 2011 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07e.pdf Proposed Water year 2011 Hydrograph: Impacts on CRSP Electric Power Resources]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07f.pdf Grand Canyon Trust Hydrograph Proposal]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_06.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-02-03-amwg-meeting/Attach_12.pdf Basin Hydrology and PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2010-01-21-twg-meeting/Attach_03b.pdf Figure 1, AOP, BOR, AMWG monthly volumes]

'''2009'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-08-12-amwg-meeting/Attach_08a.pdf FY2010-11 Draft Budget, Workplan, and Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-08-12-amwg-meeting/Attach_08b.pdf Basin Hydrology PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-04-29-amwg-meeting/Attach_11.pdf Basin Hydrology and PPT]

*[http://www.riversimulator.org/Resources/AquaticResearch/MLFFfailureKorman2004.pdf ***DRAFT*** Evidence for the Failure of the Modified Low Fluctuating Flow Alternative (MLFFA) to Benefit Most Ecological Resources in Grand Canyon ]
*[https://pubs.usgs.gov/of/2006/1243/pdf/of06-1243_508.pdf Hazel et al. 2006. Stage-Discharge Relations for the Colorado River in Glen, Marble, and Grand Canyons, Arizona: U.S. Geological Survey Open-File Report 2006-1243, 7 p]
*[https://pubs.usgs.gov/pp/pp1677/pdf/pp1677.pdf Topping et al. 2003. Computation and analysis of the instantaneous-discharge record for the Colorado River at Lees Ferry, Arizona, May 8, 1921 through September 30, 2000: U.S. Geological Survey Professional Paper 1677, 118 p.]

|-
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Other Stuff</h2>
|-
|style="color:#000;"|

|}

<Span></Span>

TCD Learning Page

2026-10-14T14:50:44Z

Cellsworth:

Entrainment

2026-10-13T20:23:59Z

Cellsworth:

Entrainment

2026-10-13T20:22:39Z

Cellsworth:

TCD Learning Page

2026-10-13T20:19:22Z

Cellsworth:

Entrainment

2026-10-13T20:18:58Z

Cellsworth:

Hydrology

2026-10-13T19:40:10Z

Cellsworth:

__NOTOC__ __NOEDITSECTION__

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[[File:Hydrology.jpg|center|300px]]


|style="width:60%; font-size:120%;"|

=='''Upper Colorado River Basin Hydrology'''==
Upper Colorado River Basin regularly experiences significant year to year hydrologic variability. During the 21-year period 2000 to 2020, however, the unregulated inflow to Lake Powell, which is a good measure of hydrologic conditions in the Colorado River Basin, was above average in only 4 out of the past 19 years. The period 2000-2020 is the lowest 21-year period since the closure of Glen Canyon Dam in 1963, with an average unregulated inflow of 8.62 maf, or 80 percent of the 30-year average (1981-2010). (For comparison, the 1981-2010 total water year average is 10.83 maf.) The unregulated inflow during the 2000-2020 period has ranged from a low of 2.64 maf (24 percent of average) in water year 2002 to a high of 15.97 maf (147 percent of average) in water year 2011. In water year 2018 unregulated inflow volume to Lake Powell was 4.6 maf (43 percent of average), the third driest year on record above 2002 and 1977. [http://www.usbr.gov/uc/water/crsp/cs/gcd.html]

|}
{| style="width:100%; height:50px" border=1px solid #ccc; background:#cedff2
! style="width=33%; background:#cedff2;" | [http://www.usbr.gov/uc/water/crsp/cs/gcd.html Current Status] <br>
! style="width=33%; background:#cedff2;" | [http://www.usbr.gov/uc/water/crsp/cs/gcd.html Current Operations] <br>
! style="width=33%; background:#cedff2;" | [http://www.usbr.gov/uc/water/crsp/cs/gcd.html Inflow Forecasts and Model Projections] <br>
|}

{|style="margin:0px 0px 0px 0px; background:none;"
|class="MainPageBG" style="width:55%; border:1px solid #cef2e0; background:#f5faff; vertical-align:top; color:#000;"|
{|width="100%" cellpadding="2" cellspacing="5" style="vertical-align:top; background:#f5faff;"
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; text-align:left; color:#000; padding:0.2em 0.4em;">Updates</h2>
|-
|style="color:#000;"|

=='''[https://www.usbr.gov/uc/index.html Upper Colorado Region Homepage]'''==
*[https://www.usbr.gov/uc/water/hydrodata/reservoir_data/919/dashboard.html Hydrodata dashboard for Lake Powell]
*[https://www.nrcs.usda.gov/Internet/WCIS/basinCharts/POR/WTEQ/assocHUC2/Upper%20Colorado%20Region.html Lake Powell Snow Chart]
*[https://www.usbr.gov/uc/water/crsp/studies/images/PowellForecast.png Lake Powell Inflow Forecast]
*[https://www.usbr.gov/uc/water/crsp/studies/images/PowellElevations.png Lake Powell Elevation Projections]
*[https://www.usbr.gov/uc/water/crsp/studies/images/PowellRelease.png Lake Powell Release Projections]
*[https://www.usbr.gov/uc/water/crsp/cs/gcd.html Glen Canyon Dam Operations]

== '''USBR Weekly Water Reports''' ==
*[https://www.usbr.gov/uc/water/rsvrs/ops/WeeklyHydrologySummary/Weekly_Hydro.pdf Upper Colorado Region Weekly Hydrology Summary]
#Reservoir inflows (forecast and observed)
#Reservoir releases
#SNOTEL

*[http://www.usbr.gov/lc/region/g4000/weekly.pdf Lower Colorado Water Supply Report]
#Water use

*[http://www.usbr.gov/lc/region/g4000/wtracct.html Lower Colorado River Water Accounting]
*[https://www.usbr.gov/uc/water/basin/index.html Colorado River Basin Tea-Cup Diagrams]

== '''USBR Monthly/Annual Reports''' ==
*[https://www.usbr.gov/uc/water/crsp/studies/index.html 24-Month Studies]

#[https://www.usbr.gov/lc/region/g4000/24mo.pdf Most Probable 24-Month Study]
#[https://www.usbr.gov/lc/region/g4000/24mo_MIN.pdf Probable Minimum 24-Month Study]
#[https://www.usbr.gov/lc/region/g4000/24mo_MAX.pdf Probable Maximum 24-Month Study]

*[https://www.usbr.gov/uc/water/rsvrs/ops/monthly_summaries/index.html Monthly Summaries]
*[https://www.usbr.gov/uc/water/rsvrs/ops/aop/index.html Annual Operating Plans for Colorado River reservoirs]

== '''Snow Pack Reports''' ==
*[https://www.nrcs.usda.gov/Internet/WCIS/basinCharts/POR/WTEQ/assocHUC2/Upper%20Colorado%20Region.html Upper Colorado River Basin Snow Water Tracking]
*[https://www.usbr.gov/uc/water/hydrodata/status_maps/ Upper Colorado Basin Conditions Map]
*[http://www.usbr.gov/uc/water/notice/snowpack.html Bureau of Reclamation- Snow Pack Report]
*[http://www.cbrfc.noaa.gov/snow/station/sweplot/sweplot.cgi?quick=multiple SNOWTEL Report]
**The snowtel report is a calculating report, and takes approximately 3 minutes to run.
**Select the report under "Public", listed as "Colorado River above Lake Powell" (116 snowtel sites).
**Data source is updated at least daily.

== '''U.S. Drought Monitor''' ==

*[http://drought.unl.edu/DM/MONITOR.HTML U.S. Drought Monitor]
*[http://treeflow.info/basin.html Tree Flow Data]

==Inflow Volumes to Lake Powell and Release Volumes from Glen Canyon Dam==

[https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html 10-year average natural inflow (2015-2024)]: 12.60 maf <br>
[https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html 10-year average unregulated inflow (2016-2025)]: 8.06 maf <br>
[https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html 10-year average release (2016-2025)]: 8.30 maf <br>
[https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html 10-year average Lees Ferry Gage (2016-2025)]: 8.44 maf <br>

{| class="sortable wikitable" style="text-align:center;"
|-
!Water Year
![https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html Naturalized Flow at Lees Ferry (maf)]
![https://www.usbr.gov/uc/water/crsp/studies/index.html Unregulated Inflow (maf)]
![https://www.usbr.gov/uc/water/crsp/studies/index.html Release Volume (maf)]
![https://www.usbr.gov/uc/water/crsp/studies/index.html Lees Ferry Gage (maf)]

|-
|2026||--||~03.516||06.000||~05.948||
|-
|2025||08.50||04.688||07.481||07.503||
|-
|2024||11.88||07.981||07.480||07.551||
|-
|2023||17.41||13.421||08.580||08.749||
|-
|2022||09.85||06.084||07.000||07.083||
|-
|2021||07.15||03.502||08.230||08.293||
|-
|2020||09.89||05.847||08.230||08.436||
|-
|2019||17.67||12.951||09.001||09.264||
|-
|2018||08.63|||04.612||09.000||09.171||
|-
|2017||16.40||11.905||09.000||09.170||
|-
|2016||13.44||09.616||09.000||09.138||
|-
|2015||13.41||10.174||09.000||09.157||
|-
|2014||13.98||10.381||07.480||07.590||
|-
|2013||09.11||05.117||08.232||08.289||
|-
|2012||08.50||04.908||09.466||09.542||
|-
|2011||20.16||15.971||12.518||12.753||
|-
|2010||12.32||08.426||08.235||08.437||
|-
|2009||14.27||10.220||08.236||08.406||
|-
|2008||16.21||12.086||08.978||09.180||
|-
|2007||12.56||08.754||08.231||08.421||
|-
|2006||12.61||08.626||08.228||08.507||
|-
|2005||16.89||12.795||08.232||08.395||
|-
|2004||09.59||05.913||08.231||08.348||
|-
|2003||10.53||06.161||08.229||08.372||
|-
|2002||05.93||02.643||08.230||08.347||
|-
|2001||11.04||06.994||08.236||08.361||
|-
|2000||10.56||06.936||09.381||09.529||
|-
|1999||16.43||12.800||11.204||11.430||
|-
|1998||16.97||13.520||13.510||13.440||
|-
|1997||21.15||17.053||13.824||13.874||
|-
|1996||14.07||10.402||11.522||11.532||
|-
|1995||19.80||15.905||09.223||09.242||
|-
|1994||10.64||06.794||08.289||08.304||
|-
|1993||18.63||14.437||08.102||08.137||
|-
|1992||11.10||07.352||08.002||08.023||
|-
|1991||12.35||08.801||08.121||08.131||
|-
|1990||09.00||05.311||08.140||08.151||
|-
|1989||09.60||05.939||07.981||07.994||
|-
|1988||11.68||07.989||08.144||08.160||
|-
|1987||16.61||13.377||13.429||13.450||
|-
|1986||22.36||18.546||16.848||16.866||
|-
|1985||21.06||17.517||19.094||19.109||
|-
|1984||24.18||20.846||20.499||20.518||
|-
|1983||23.70||20.371||17.493||17.520||
|-
|1982||16.67||12.771||08.304||08.323||
|-
|1981||08.68||05.639||08.295||08.316||
|-
|1980||17.27||13.682||10.907||10.950||
|-
|1979||17.55||14.189||08.297||08.333||
|-
|1978||14.85||11.059||08.354||08.369||
|-
|1977||05.52||03.529||08.260||08.269||
|-
|1976||11.21||08.431||08.482||08.494||
|-
|1975||16.53||13.095||09.255||09.274||
|-
|1974||12.96||09.970||08.266||08.277||
|-
|1973||19.14||15.974||10.108||10.141||
|-
|1972||12.44||09.329||09.311||09.330||
|-
|1971||14.73||11.798||08.591||08.607||
|-
|1970||15.06||11.992||08.692||08.688||
|-
|1969||14.45||11.520||08.823||08.850 ||
|-
|1968||13.34||10.319||08.334||08.358 ||
|-
|1967||11.71||08.979||07.797||07.824 ||
|-
|1966||11.06||08.689||07.854||07.870 ||
|-
|1965||18.36||15.046||10.820||10.835 ||
|-
|1964||10.38||07.492||02.413||02.427||

|}

[[File:LakePowellInflows1906 2012.JPG|left|500px|thumbnail|[https://usea.org/sites/default/files/event-/Final_Colorado_Overview.pdf https://usea.org/sites/default/files/event-/Final_Colorado_Overview.pdf] ]]

[[File:GlenCanyonRelease1995 2015.JPG|left|500px|thumbnail|[http://www.lakepowell.org/page_two/what_s_new/what_s_new.html http://www.lakepowell.org/page_two/what_s_new/what_s_new.html] ]]

[[File:LakePowellelevations1963 2012.JPG|left|500px|thumbnail|[https://www.hcn.org/blogs/goat/is-lake-powell-really-shrinking https://www.hcn.org/blogs/goat/is-lake-powell-really-shrinking] ]]

|}


|class="MainPageBG" style="width:45%; border:1px solid #cedff2; background:#f5faff; vertical-align:top;"|
{| width="100%" cellpadding="2" cellspacing="5" style="vertical-align:top; background:#f5faff;"
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Stream Flow Gages</h2>
|-
|style="color:#000;"|

*[http://graphs.water-data.com/lakepowell/ Lake Powell Water Level Graphs]
*[https://www.wapa.gov/regions/CRSP/OpsMaint/Pages/scada.aspx Glen Canyon Dam releases (SCADA)]
*[https://www.usbr.gov/lc/region/g4000/riverops/_HdbWebQuery.html Glen Canyon Dam releases (HDB), SDI for total release = 1872]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-GCLT1 Water Holes Canyon above the mouth]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09380000 Colorado River at Lees Ferry]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09381800 Paria River near Kanab, UT]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09382000 Paria River at Lees Ferry, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT1 Badger Creek below highway 89A near Vermillion Cliffs, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT2 Tanner Wash below highway 89A near Bitter Springs, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT3 House Rock Wash above Emmett Wash near Cliff Dwellers, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT5 North Canyon near Cliff Dwellers, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT6 Shinumo Wash in Twentynine Mile Canyon near Cedar Ridge, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09383050 Colorado River near river mile 30]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09383100 Colorado River above Little Colorado River near Desert View, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401260 Moenkopi Wash at Moenkopi, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401500 Moenkopi Wash near Cameron, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401000 Little Colorado River at Grand Falls, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402000 Little Colorado River near Cameron, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402300 Little Colorado River above the mouth near Desert View, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402500 Colorado River near Grand Canyon, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09403000 Bright Angel Creek near Grand Canyon, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT6 Shinumo Creek]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09403850 Kanab Creek above the mouth near Supai, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404115 Havasu Creek above the mouth near Supai, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404120 Colorado River above National Canyon near Supai, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404200 Colorado River above Diamond Creek near Peach Springs, AZ]
*[http://graphs.water-data.com/lakemead/ Lake Mead Water Level Graphs]

|-
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Presentations and Papers</h2>
|-
|style="color:#000;"|

'''2026'''
*[https://www.usbr.gov/uc/progact/amp/twg/2026-06-10-twg-meeting/uc-gcdamp-twg-basinhydrology-508-20260610.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2026-05-13-amwg-meeting/uc-gcdamp-amwg-basinhydrology-508-20260513.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/twg/2026-04-09-twg-meeting/uc-gcdamp-twg-basinhydrology-508-20260409.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/twg/2026-02-05-twg-meeting/uc-gcdamp-twg-basinhydrology-508-20260205.pdf Basin Hydrology and Operations]

'''2025'''
*[https://www.usbr.gov/uc/progact/amp/twg/2024-07-10-twg-meeting/20240710-BasinHydrologyOperations-508-AMWD.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/twg/2025-04-10-twg-meeting/uc-gcdamp-twg-basinhydrology-508-20250410.pdf Basin Hydrology and Operations]
*[[Media:Schmidt_Fleck_reservoir_storage.pdf|Colorado River Basin Reservoir Storage: where do we stand?]]

'''2024'''
*[https://www.usbr.gov/uc/progact/amp/twg/2024-10-30-twg-meeting/20241030-BasinHydrologyOperations-508-AMWQD.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2024-08-22-amwg-meeting/20240822-BasinHydrologyOperations-508-AMWQD.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2024-05-15-amwg-meeting/20240515-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2024-02-29-amwg-meeting/20240229-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2024-01-25-twg-meeting/20240125-TWGMeeting-UpperColoradoRiverBasinIRADroughtMitigationPrograms-508-UCRO.pdf Upper Colorado River Basin IRA Drought Mitigation Programs ]
*[https://www.usbr.gov/uc/progact/amp/twg/2024-01-25-twg-meeting/20240125-TWGMeeting-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://qcnr.usu.edu/coloradoriver/blog/WY2023-schmidt-4 Reservoir Storage at the End of 2023 – Holding On to What We Have]

'''2023'''
*[https://www.usbr.gov/uc/progact/amp/twg/2023-11-08-twg-meeting/20231108-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality]
*[https://www.usbr.gov/uc/progact/amp/amwg/2023-08-17-amwg-meeting/20230817-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-06-15-twg-meeting/20230615-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations, and Water Quality]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-04-13-twg-meeting/20230413-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2023-02-16-amwg-meeting/20230216-GlenCanyonDamOperationsUpperBasinHydrologyWaterQuality-508-UCRO.pdf Glen Canyon Dam Operations and Upper Basin Hydrology and Water Quality]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-01-26-twg-meeting/20230126-TWGMeeting-BasinHydrologyWaterQuality-508-UCRO.pdf Basin Hydrology and Water Quality]

'''2022'''
*[https://qcnr.usu.edu/coloradoriver/files/news/White-Paper-7.pdf Evaluating the Accuracy of Reclamation’s 24-Month Study Lake Powell Projections]
*[https://www.usbr.gov/uc/progact/amp/twg/2022-10-13-twg-meeting/20221013-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-08-18-amwg-meeting/20220818-Smith-AMWG-DROA-PPT_508.pdf AMP Role Relative to Implementing the Drought Response Operating Agreement]
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-08-18-amwg-meeting/20220818-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/twg/2022-06-16-twg-meeting/20220616-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-05-18-amwg-meeting/20220518-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2022-04-13-twg-meeting/20220413-BasinHydrologyOperationsWaterQuality-Presentation-508-UCRO.pdf Basin Hydrology, Operations, and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/twg/2022-01-13-twg-meeting/20220113-TWGMeeting-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-02-10-amwg-meeting/20220210-BasinHydrologyWaterQualityOperations-508-UCRO.pdf Basin Hydrology, Water Quality, and Operations ]

'''2021'''
*[https://www.usbr.gov/uc/progact/amp/twg/2021-10-14-twg-meeting/20211014-ColoradoRiverBasinAugust20215-yearProjectedFutureConditions-Presentation-508-UCRO.pdf Colorado River Basin August 2021 5-year Projected Future Conditions ]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-10-14-twg-meeting/20211014-Long-TermHydrologicProjectionsColoradoRiverBasinMethodsConsideringUncertainty-Presentation-508-UCRO.pdf Long-Term Hydrologic Projections for the Colorado River Basin and Methods for Considering Uncertainty]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-06-17-twg-meeting/20210617-ColoradoRiverBasinApril20215-yearProjectedFutureConditions-508-UCRO.pdf Colorado River Basin April 2021 5-year Projected Future Conditions ]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-06-17-twg-meeting/20210617-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2021-05-19-amwg-meeting/20210519-BasinHydrologyOperation-Presentation-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-04-14-twg-meeting/20210414-UpdateHydrologyOperationsWaterQualityConditions-508-UCRO.pdf Update on Hydrology, Operations and Water Quality Conditions ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2021-02-11-amwg-meeting/20210211-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-01-22-twg-meeting/20210122-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]

'''2020'''
*[https://www.usbr.gov/uc/progact/amp/twg/2020-10-15-twg-meeting/20201015-OpsHydrologyTWG-508.pdf TWG Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2020-08-20-amwg-meeting/20200820-BasinHydrologyReservoirOperations2020-2021Hydrograph-Presentation-508-UCRO.pdf Basin Hydrology, Reservoir Operations 2020 and 2021 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/twg/2020-06-24-twg-meeting/20200624-HydrologyOperationsReservoirRelease-508-UCRO.pdf Hydrology, Operations and Reservoir Release presentation ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2020-05-20-amwg-meeting/20200520-AMWG-HydrologyOperationsReservoirRelease-508-UCRO.pdf Hydrology, Operations and Reservoir Release presentation ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2020-02-12-amwg-meeting/20200212-AMWG-HydrologyOperationsReservoirRelease-Presentation-508-UCRO.pdf Hydrology, Operations and Reservoir Release]

'''2019'''
*[https://www.usbr.gov/uc/progact/amp/twg/2019-10-21-twg-meeting/20191021-BasinHydrologyReservoirOperations2020Hydrograph-Presentation-508-UCRO.pdf Basin Hydrology, Reservoir Operations and 2020 Hydrograph Presentation ]

'''2018'''
*[http://www.yumaheritage.com/docs/2nd-A-1JackSchmidt_USU_LoganUT.pdf?bcsi_scan_16614fa24ff8c4a5=0&bcsi_scan_filename=2nd-A-1JackSchmidt_USU_LoganUT.pdf Urban Waterfronts 2018]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-10-10-twg-meeting/Attach_06.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2018-08-22-amwg-meeting/Attach_02.pdf Basin Hydrology, Reservoir Operations 2018 and 2019 Hydrograph]
*[https://qcnr.usu.edu/wats/colorado_river_studies/files/documents/Udall.pdf How Will the Colorado Run? The Colorado River in a Warmer World]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-06-25-twg-meeting/Attach_04.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2018-05-22-amwg-meeting/Attach_02.pdf Basin Hydrology, Reservoir Operations 2018 and 2019 Hydrograph PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-04-23-twg-meeting/Attach_13.pdf The 21st Century Colorado River Hot Drought and Implications for the Future PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-04-23-twg-meeting/Attach_06.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2018-02-14-amwg-meeting/Attach_03.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-01-25-twg-meeting/AR21.pdf Basin Hydrology, Operations and 2018 Hydrograph PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-01-25-twg-meeting/Attach_04.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]

'''2017'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2017-02-15-amwg-meeting/Attach_16.pdf Analysis of Water Losses and Impacts to the Grand Canyon Ecosystem of the "Fill Mead First" Proposal]
*[https://qcnr.usu.edu/wats/colorado_river_studies/files/documents/Fill_Mead_First_Exec_Summary.pdf Fill Mead First: A technical assessment (Summary)]
*[https://qcnr.usu.edu/wats/colorado_river_studies/files/documents/Fill_Mead_First_Analysis.pdf Fill Mead First: A technical assessment (Analysis)]
*[https://www.usbr.gov/uc/progact/amp/twg/2017-04-20-twg-meeting/Attach_03.pdf Basin Hydrology and Operations]
*[[Media:Feb2017 OperationsCall.pdf| February 2017 Glen Canyon Montly Operational Coordination Call]]
*[https://www.usbr.gov/uc/progact/amp/amwg/2017-02-15-amwg-meeting/Attach_05.pdf Basin Hydrology, and 2017-2018 Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2017-02-15-amwg-meeting/Attach_16.pdf Analysis of Water Losses and Impacts to the Grand Canyon Ecosystem of the "Fill Mead First" Proposal and PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2017-01-26-twg-meeting/A6_Davidson.pdf Basin Hydrology, Operations and 2018 Hydrograph]

'''2016'''
*[[Media:Aug2016 Information.pdf| August 2016 DOI-DOE Federal Family call on Glen Canyon Operations ]]
*[https://qcnr.usu.edu/coloradoriver/news/wp1.php Fill Mead First – A Technical Assessment]
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-08-24-amwg-meeting/Attach_05.pdf Basin Hydrology and Water Year (WY) 2017 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-05-25-amwg-meeting/Attach_02.pdf Basin Hydrology, Operations, and 2017 Hydrograph]
*[[Media:2017 Hydrology PPT.pdf| TWG: Basin Hydrology, Operations, and 2017 Hydrograph]]
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-02-24-amwg-meeting/Attach_08.pdf Basin Hydrology, Operations, and 2017 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/Attach_03.pdf Glen Canyon Dam Operations During Equalization]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/AR01_Topping.pdf Project 2: Streamflow, Water Quality, Sediment Transport, and Sand Budgets in the Colorado River Ecosystem]

'''2015'''
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGMHhacTF4enJ1eGs/view 2016 Annual Operating Plan]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGTU41NkhzUi1ZTTg/view California Drought Monitor]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGOVVVUXFhZVBvNmM/view Lake Mead Issues and Lower Basin Shortage Preparedness]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGbDNmN3FOeW05b3c/view Lake Mead Issues and Lower Basin Shortage Preparedness - Presentation]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGbmRuSzRqVm5ydHc/view Basin Hydrology Operations, and 2016 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-06-11-twg-meeting/Attach_04.pdf Basin Hydrology Operations, and 2016 Hydrograph]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGMHhacTF4enJ1eGs/view 2016 Annual Operating Plan]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-05-28-amwg-meeting/Attach_05.pdf Basin Hydrology and WY 2016 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-04-21-twg-meeting/Attach_03.pdf Hydrology Update and 2016 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-04-21-twg-meeting/Attach_07.pdf Water Quality in Lake Mead and Upstream Influences: Dissolved Oxygen during 2014]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_02.pdf Basin Hydrology, Operations, and 2016 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03a.pdf Panel on Current Projects and Issues in Utah]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03b.pdf Central Utah Project]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03c.pdf Meeting the Mitigation Requirement for the Bonneville Unit CUP]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03d.pdf Current Projects and Issues in Utah]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03e.pdf Provo Area Office]

'''2014'''
*[https://www.usbr.gov/uc/progact/amp/twg/2014-10-28-twg-meeting/Attach_09.pdf Colorado River Annual Operating Plan and Drought Contingency Planning ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-08-27-amwg-meeting/Attach_02b.pdf DOI-DOE Hydrograph Development for Water Year 2015 ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-08-27-amwg-meeting/Attach_02a.pdf Basin Hydrology, Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2014-06-24-twg-meeting/Attach_06a.pdf Basin Hydrology, Operations, and 2015 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-05-27-amwg-meeting/Attach_01.pdf Basin Hydrology, Operations, and 2015 Hydrograph and AIF: Development of Water Year 2015 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-02-19-amwg-meeting/Attach_02.pdf Basin Hydrology, Operations, and 2015 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-02-19-amwg-meeting/Attach_03a.pdf Panel on the Potential Effects of Long-Term Drought on Colorado River Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-02-19-amwg-meeting/Attach_03b.pdf Near Term Risks: Options to Address Declining Reservoirs ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-02-19-amwg-meeting/Attach_03c.pdf State of Nevada Concerns ]

'''2013'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-08-08-amwg-meeting/Attach_04.pdf Water Year 2014 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-08-08-amwg-meeting/Attach_03.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-06-26-twg-meeting/Attach_04.pdf Colorado River Basin Hydrology and Projected Glen Canyon Dam Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-06-26-twg-meeting/Attach_05a.pdf DOI/DOE FY14 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-06-26-twg-meeting/Attach_05b.pdf Approved FY14 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-02-20-amwg-meeting/Attach_04.pdf Glen Canyon Dam Facility Management]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-02-20-amwg-meeting/Attach_02.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-02-20-amwg-meeting/Attach_03.pdf Colorado River Basin Water Supply and Demand Study]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-01-24-twg-meeting/Attach_05.pdf Executive Summary--Pre-Production Copy of the Colorado River Basin Water Supply and Demand Study]
*[https://www.usbr.gov/lc/region/programs/crbstudy/finalreport/index.html Colorado River Basin Water Study & Demand Study - Final Study Reports]

'''2012'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-08-29-amwg-meeting/Attach_03.pdf Basin Hydrology ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-08-29-amwg-meeting/Attach_06a.pdf Water Year 2013 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-08-29-amwg-meeting/Attach_06b.pdf TWG Report: 2013 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/twg/2012-06-20-twg-meeting/Attach_04a.pdf DOI and DOE Operating Hydrograph Recommendations for GCD (2012 water year)]
*[https://www.usbr.gov/uc/progact/amp/twg/2012-06-20-twg-meeting/Attach_04b.pdf Water Year 2013 Hydrograph TWG Motion ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Attach_05.pdf 2013 Hydrograph Development ]
*[https://www.usbr.gov/uc/progact/amp/twg/2012-02-02-twg-meeting/Attach_07.pdf FY2013 Hydrograph (from 8/2011 AMWG meeting)]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Attach_09.pdf Basin Hydrology and Operations ]
*[https://www.gcmrc.gov/about/ka/KA%202%20-%2010-19-11/AM%20Talks/Grams%20Flow%20Temp%20Turbidity.pdf Flow Temp Turbidity ]

'''2011'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-08-24-amwg-meeting/Attach_09.pdf 2012 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-08-24-amwg-meeting/Attach_08.pdf Basin Hydrology ]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-06-28-twg-meeting/Attach_06a.pdf 2012 Hydrograph Development ]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-06-28-twg-meeting/Attach_06b.pdf Department of the Interior and Department of Energy Operating Hydrograph Recommendations for Glen Canyon Dam (2012 Water Year), June 6, 2011]
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-05-18-amwg-meeting/Attach_03.pdf Basin Hydrology ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-05-18-amwg-meeting/Attach_10.pdf Secure Water Act Section 9503 (c) - Water and Climate Change]
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-05-18-amwg-meeting/Attach_04.pdf WY2012 Hydrograph Development ]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-03-08-twg-meeting/Attach_05a.pdf 2012 Hydrograph Development ]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-03-08-twg-meeting/Attach_05b.pdf Grand Canyon Trust Proposed FY2012 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-01-20-twg-meeting/Attach_04a.pdf Bureau of Reclamation Updates ]

'''2010'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07a.pdf Fiscal Year 2011-12 Hydrograph and E-mail Message to the AMWG from Anne Castle Dated July 23, 2010, Subject: July 23 Final Draft DOI-DOE Proposed Hydrograph Recommendations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07b.pdf Department of the Interior and Department of the Energy Recommendations for Glen Canyon Dam with August 23, 2010, edits]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07c.pdf Grand Canyon Protection Act]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07d.pdf Report on Modeling the 2008-2010 Period to Support Development of the 2011 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07e.pdf Proposed Water year 2011 Hydrograph: Impacts on CRSP Electric Power Resources]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07f.pdf Grand Canyon Trust Hydrograph Proposal]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_06.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-02-03-amwg-meeting/Attach_12.pdf Basin Hydrology and PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2010-01-21-twg-meeting/Attach_03b.pdf Figure 1, AOP, BOR, AMWG monthly volumes]

'''2009'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-08-12-amwg-meeting/Attach_08a.pdf FY2010-11 Draft Budget, Workplan, and Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-08-12-amwg-meeting/Attach_08b.pdf Basin Hydrology PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-04-29-amwg-meeting/Attach_11.pdf Basin Hydrology and PPT]

*[http://www.riversimulator.org/Resources/AquaticResearch/MLFFfailureKorman2004.pdf ***DRAFT*** Evidence for the Failure of the Modified Low Fluctuating Flow Alternative (MLFFA) to Benefit Most Ecological Resources in Grand Canyon ]
*[https://pubs.usgs.gov/of/2006/1243/pdf/of06-1243_508.pdf Hazel et al. 2006. Stage-Discharge Relations for the Colorado River in Glen, Marble, and Grand Canyons, Arizona: U.S. Geological Survey Open-File Report 2006-1243, 7 p]
*[https://pubs.usgs.gov/pp/pp1677/pdf/pp1677.pdf Topping et al. 2003. Computation and analysis of the instantaneous-discharge record for the Colorado River at Lees Ferry, Arizona, May 8, 1921 through September 30, 2000: U.S. Geological Survey Professional Paper 1677, 118 p.]

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Hydrology

2026-10-13T17:34:47Z

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[[File:Hydrology.jpg|center|300px]]


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=='''Upper Colorado River Basin Hydrology'''==
Upper Colorado River Basin regularly experiences significant year to year hydrologic variability. During the 21-year period 2000 to 2020, however, the unregulated inflow to Lake Powell, which is a good measure of hydrologic conditions in the Colorado River Basin, was above average in only 4 out of the past 19 years. The period 2000-2020 is the lowest 21-year period since the closure of Glen Canyon Dam in 1963, with an average unregulated inflow of 8.62 maf, or 80 percent of the 30-year average (1981-2010). (For comparison, the 1981-2010 total water year average is 10.83 maf.) The unregulated inflow during the 2000-2020 period has ranged from a low of 2.64 maf (24 percent of average) in water year 2002 to a high of 15.97 maf (147 percent of average) in water year 2011. In water year 2018 unregulated inflow volume to Lake Powell was 4.6 maf (43 percent of average), the third driest year on record above 2002 and 1977. [http://www.usbr.gov/uc/water/crsp/cs/gcd.html]

|}
{| style="width:100%; height:50px" border=1px solid #ccc; background:#cedff2
! style="width=33%; background:#cedff2;" | [http://www.usbr.gov/uc/water/crsp/cs/gcd.html Current Status] <br>
! style="width=33%; background:#cedff2;" | [http://www.usbr.gov/uc/water/crsp/cs/gcd.html Current Operations] <br>
! style="width=33%; background:#cedff2;" | [http://www.usbr.gov/uc/water/crsp/cs/gcd.html Inflow Forecasts and Model Projections] <br>
|}

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{|width="100%" cellpadding="2" cellspacing="5" style="vertical-align:top; background:#f5faff;"
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; text-align:left; color:#000; padding:0.2em 0.4em;">Updates</h2>
|-
|style="color:#000;"|

=='''[https://www.usbr.gov/uc/index.html Upper Colorado Region Homepage]'''==
*[https://www.usbr.gov/uc/water/hydrodata/reservoir_data/919/dashboard.html Hydrodata dashboard for Lake Powell]
*[https://www.nrcs.usda.gov/Internet/WCIS/basinCharts/POR/WTEQ/assocHUC2/Upper%20Colorado%20Region.html Lake Powell Snow Chart]
*[https://www.usbr.gov/uc/water/crsp/studies/images/PowellForecast.png Lake Powell Inflow Forecast]
*[https://www.usbr.gov/uc/water/crsp/studies/images/PowellElevations.png Lake Powell Elevation Projections]
*[https://www.usbr.gov/uc/water/crsp/studies/images/PowellRelease.png Lake Powell Release Projections]
*[https://www.usbr.gov/uc/water/crsp/cs/gcd.html Glen Canyon Dam Operations]

== '''USBR Weekly Water Reports''' ==
*[https://www.usbr.gov/uc/water/rsvrs/ops/WeeklyHydrologySummary/Weekly_Hydro.pdf Upper Colorado Region Weekly Hydrology Summary]
#Reservoir inflows (forecast and observed)
#Reservoir releases
#SNOTEL

*[http://www.usbr.gov/lc/region/g4000/weekly.pdf Lower Colorado Water Supply Report]
#Water use

*[http://www.usbr.gov/lc/region/g4000/wtracct.html Lower Colorado River Water Accounting]
*[https://www.usbr.gov/uc/water/basin/index.html Colorado River Basin Tea-Cup Diagrams]

== '''USBR Monthly/Annual Reports''' ==
*[https://www.usbr.gov/uc/water/crsp/studies/index.html 24-Month Studies]

#[https://www.usbr.gov/lc/region/g4000/24mo.pdf Most Probable 24-Month Study]
#[https://www.usbr.gov/lc/region/g4000/24mo_MIN.pdf Probable Minimum 24-Month Study]
#[https://www.usbr.gov/lc/region/g4000/24mo_MAX.pdf Probable Maximum 24-Month Study]

*[https://www.usbr.gov/uc/water/rsvrs/ops/monthly_summaries/index.html Monthly Summaries]
*[https://www.usbr.gov/uc/water/rsvrs/ops/aop/index.html Annual Operating Plans for Colorado River reservoirs]

== '''Snow Pack Reports''' ==
*[https://www.nrcs.usda.gov/Internet/WCIS/basinCharts/POR/WTEQ/assocHUC2/Upper%20Colorado%20Region.html Upper Colorado River Basin Snow Water Tracking]
*[https://www.usbr.gov/uc/water/hydrodata/status_maps/ Upper Colorado Basin Conditions Map]
*[http://www.usbr.gov/uc/water/notice/snowpack.html Bureau of Reclamation- Snow Pack Report]
*[http://www.cbrfc.noaa.gov/snow/station/sweplot/sweplot.cgi?quick=multiple SNOWTEL Report]
**The snowtel report is a calculating report, and takes approximately 3 minutes to run.
**Select the report under "Public", listed as "Colorado River above Lake Powell" (116 snowtel sites).
**Data source is updated at least daily.

== '''U.S. Drought Monitor''' ==

*[http://drought.unl.edu/DM/MONITOR.HTML U.S. Drought Monitor]
*[http://treeflow.info/basin.html Tree Flow Data]

==Inflow Volumes to Lake Powell and Release Volumes from Glen Canyon Dam==

[https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html 10-year average natural inflow (2015-2024)]: 12.60 maf <br>
[https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html 10-year average unregulated inflow (2016-2025)]: 8.06 maf <br>
[https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html 10-year average release (2016-2025)]: 8.30 maf <br>
[https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html 10-year average Lees Ferry Gage (2016-2025)]: 8.44 maf <br>

{| class="sortable wikitable" style="text-align:center;"
|-
!Water Year
![https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html Naturalized Flow at Lees Ferry (maf)]
![https://www.usbr.gov/uc/water/crsp/studies/index.html Unregulated Inflow (maf)]
![https://www.usbr.gov/uc/water/crsp/studies/index.html Release Volume (maf)]
![https://www.usbr.gov/uc/water/crsp/studies/index.html Lees Ferry Gage (maf)]

|-
|2026||--||~03.401||~06.000||--||
|-
|2025||08.50||04.688||07.481||07.503||
|-
|2024||11.88||07.981||07.480||07.551||
|-
|2023||17.41||13.421||08.580||08.749||
|-
|2022||09.85||06.084||07.000||07.083||
|-
|2021||07.15||03.502||08.230||08.293||
|-
|2020||09.89||05.847||08.230||08.436||
|-
|2019||17.67||12.951||09.001||09.264||
|-
|2018||08.63|||04.612||09.000||09.171||
|-
|2017||16.40||11.905||09.000||09.170||
|-
|2016||13.44||09.616||09.000||09.138||
|-
|2015||13.41||10.174||09.000||09.157||
|-
|2014||13.98||10.381||07.480||07.590||
|-
|2013||09.11||05.117||08.232||08.289||
|-
|2012||08.50||04.908||09.466||09.542||
|-
|2011||20.16||15.971||12.518||12.753||
|-
|2010||12.32||08.426||08.235||08.437||
|-
|2009||14.27||10.220||08.236||08.406||
|-
|2008||16.21||12.086||08.978||09.180||
|-
|2007||12.56||08.754||08.231||08.421||
|-
|2006||12.61||08.626||08.228||08.507||
|-
|2005||16.89||12.795||08.232||08.395||
|-
|2004||09.59||05.913||08.231||08.348||
|-
|2003||10.53||06.161||08.229||08.372||
|-
|2002||05.93||02.643||08.230||08.347||
|-
|2001||11.04||06.994||08.236||08.361||
|-
|2000||10.56||06.936||09.381||09.529||
|-
|1999||16.43||12.800||11.204||11.430||
|-
|1998||16.97||13.520||13.510||13.440||
|-
|1997||21.15||17.053||13.824||13.874||
|-
|1996||14.07||10.402||11.522||11.532||
|-
|1995||19.80||15.905||09.223||09.242||
|-
|1994||10.64||06.794||08.289||08.304||
|-
|1993||18.63||14.437||08.102||08.137||
|-
|1992||11.10||07.352||08.002||08.023||
|-
|1991||12.35||08.801||08.121||08.131||
|-
|1990||09.00||05.311||08.140||08.151||
|-
|1989||09.60||05.939||07.981||07.994||
|-
|1988||11.68||07.989||08.144||08.160||
|-
|1987||16.61||13.377||13.429||13.450||
|-
|1986||22.36||18.546||16.848||16.866||
|-
|1985||21.06||17.517||19.094||19.109||
|-
|1984||24.18||20.846||20.499||20.518||
|-
|1983||23.70||20.371||17.493||17.520||
|-
|1982||16.67||12.771||08.304||08.323||
|-
|1981||08.68||05.639||08.295||08.316||
|-
|1980||17.27||13.682||10.907||10.950||
|-
|1979||17.55||14.189||08.297||08.333||
|-
|1978||14.85||11.059||08.354||08.369||
|-
|1977||05.52||03.529||08.260||08.269||
|-
|1976||11.21||08.431||08.482||08.494||
|-
|1975||16.53||13.095||09.255||09.274||
|-
|1974||12.96||09.970||08.266||08.277||
|-
|1973||19.14||15.974||10.108||10.141||
|-
|1972||12.44||09.329||09.311||09.330||
|-
|1971||14.73||11.798||08.591||08.607||
|-
|1970||15.06||11.992||08.692||08.688||
|-
|1969||14.45||11.520||08.823||08.850 ||
|-
|1968||13.34||10.319||08.334||08.358 ||
|-
|1967||11.71||08.979||07.797||07.824 ||
|-
|1966||11.06||08.689||07.854||07.870 ||
|-
|1965||18.36||15.046||10.820||10.835 ||
|-
|1964||10.38||07.492||02.413||02.427||

|}

[[File:LakePowellInflows1906 2012.JPG|left|500px|thumbnail|[https://usea.org/sites/default/files/event-/Final_Colorado_Overview.pdf https://usea.org/sites/default/files/event-/Final_Colorado_Overview.pdf] ]]

[[File:GlenCanyonRelease1995 2015.JPG|left|500px|thumbnail|[http://www.lakepowell.org/page_two/what_s_new/what_s_new.html http://www.lakepowell.org/page_two/what_s_new/what_s_new.html] ]]

[[File:LakePowellelevations1963 2012.JPG|left|500px|thumbnail|[https://www.hcn.org/blogs/goat/is-lake-powell-really-shrinking https://www.hcn.org/blogs/goat/is-lake-powell-really-shrinking] ]]

|}


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{| width="100%" cellpadding="2" cellspacing="5" style="vertical-align:top; background:#f5faff;"
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Stream Flow Gages</h2>
|-
|style="color:#000;"|

*[http://graphs.water-data.com/lakepowell/ Lake Powell Water Level Graphs]
*[https://www.wapa.gov/regions/CRSP/OpsMaint/Pages/scada.aspx Glen Canyon Dam releases (SCADA)]
*[https://www.usbr.gov/lc/region/g4000/riverops/_HdbWebQuery.html Glen Canyon Dam releases (HDB), SDI for total release = 1872]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-GCLT1 Water Holes Canyon above the mouth]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09380000 Colorado River at Lees Ferry]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09381800 Paria River near Kanab, UT]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09382000 Paria River at Lees Ferry, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT1 Badger Creek below highway 89A near Vermillion Cliffs, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT2 Tanner Wash below highway 89A near Bitter Springs, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT3 House Rock Wash above Emmett Wash near Cliff Dwellers, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT5 North Canyon near Cliff Dwellers, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT6 Shinumo Wash in Twentynine Mile Canyon near Cedar Ridge, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09383050 Colorado River near river mile 30]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09383100 Colorado River above Little Colorado River near Desert View, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401260 Moenkopi Wash at Moenkopi, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401500 Moenkopi Wash near Cameron, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401000 Little Colorado River at Grand Falls, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402000 Little Colorado River near Cameron, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402300 Little Colorado River above the mouth near Desert View, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402500 Colorado River near Grand Canyon, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09403000 Bright Angel Creek near Grand Canyon, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT6 Shinumo Creek]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09403850 Kanab Creek above the mouth near Supai, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404115 Havasu Creek above the mouth near Supai, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404120 Colorado River above National Canyon near Supai, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404200 Colorado River above Diamond Creek near Peach Springs, AZ]
*[http://graphs.water-data.com/lakemead/ Lake Mead Water Level Graphs]

|-
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Presentations and Papers</h2>
|-
|style="color:#000;"|

'''2026'''
*[https://www.usbr.gov/uc/progact/amp/twg/2026-06-10-twg-meeting/uc-gcdamp-twg-basinhydrology-508-20260610.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2026-05-13-amwg-meeting/uc-gcdamp-amwg-basinhydrology-508-20260513.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/twg/2026-04-09-twg-meeting/uc-gcdamp-twg-basinhydrology-508-20260409.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/twg/2026-02-05-twg-meeting/uc-gcdamp-twg-basinhydrology-508-20260205.pdf Basin Hydrology and Operations]

'''2025'''
*[https://www.usbr.gov/uc/progact/amp/twg/2024-07-10-twg-meeting/20240710-BasinHydrologyOperations-508-AMWD.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/twg/2025-04-10-twg-meeting/uc-gcdamp-twg-basinhydrology-508-20250410.pdf Basin Hydrology and Operations]
*[[Media:Schmidt_Fleck_reservoir_storage.pdf|Colorado River Basin Reservoir Storage: where do we stand?]]

'''2024'''
*[https://www.usbr.gov/uc/progact/amp/twg/2024-10-30-twg-meeting/20241030-BasinHydrologyOperations-508-AMWQD.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2024-08-22-amwg-meeting/20240822-BasinHydrologyOperations-508-AMWQD.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2024-05-15-amwg-meeting/20240515-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2024-02-29-amwg-meeting/20240229-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2024-01-25-twg-meeting/20240125-TWGMeeting-UpperColoradoRiverBasinIRADroughtMitigationPrograms-508-UCRO.pdf Upper Colorado River Basin IRA Drought Mitigation Programs ]
*[https://www.usbr.gov/uc/progact/amp/twg/2024-01-25-twg-meeting/20240125-TWGMeeting-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://qcnr.usu.edu/coloradoriver/blog/WY2023-schmidt-4 Reservoir Storage at the End of 2023 – Holding On to What We Have]

'''2023'''
*[https://www.usbr.gov/uc/progact/amp/twg/2023-11-08-twg-meeting/20231108-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality]
*[https://www.usbr.gov/uc/progact/amp/amwg/2023-08-17-amwg-meeting/20230817-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-06-15-twg-meeting/20230615-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations, and Water Quality]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-04-13-twg-meeting/20230413-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2023-02-16-amwg-meeting/20230216-GlenCanyonDamOperationsUpperBasinHydrologyWaterQuality-508-UCRO.pdf Glen Canyon Dam Operations and Upper Basin Hydrology and Water Quality]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-01-26-twg-meeting/20230126-TWGMeeting-BasinHydrologyWaterQuality-508-UCRO.pdf Basin Hydrology and Water Quality]

'''2022'''
*[https://qcnr.usu.edu/coloradoriver/files/news/White-Paper-7.pdf Evaluating the Accuracy of Reclamation’s 24-Month Study Lake Powell Projections]
*[https://www.usbr.gov/uc/progact/amp/twg/2022-10-13-twg-meeting/20221013-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-08-18-amwg-meeting/20220818-Smith-AMWG-DROA-PPT_508.pdf AMP Role Relative to Implementing the Drought Response Operating Agreement]
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-08-18-amwg-meeting/20220818-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/twg/2022-06-16-twg-meeting/20220616-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-05-18-amwg-meeting/20220518-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2022-04-13-twg-meeting/20220413-BasinHydrologyOperationsWaterQuality-Presentation-508-UCRO.pdf Basin Hydrology, Operations, and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/twg/2022-01-13-twg-meeting/20220113-TWGMeeting-BasinHydrologyOperationsWaterQuality-508-UCRO.pdf Basin Hydrology, Operations and Water Quality ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-02-10-amwg-meeting/20220210-BasinHydrologyWaterQualityOperations-508-UCRO.pdf Basin Hydrology, Water Quality, and Operations ]

'''2021'''
*[https://www.usbr.gov/uc/progact/amp/twg/2021-10-14-twg-meeting/20211014-ColoradoRiverBasinAugust20215-yearProjectedFutureConditions-Presentation-508-UCRO.pdf Colorado River Basin August 2021 5-year Projected Future Conditions ]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-10-14-twg-meeting/20211014-Long-TermHydrologicProjectionsColoradoRiverBasinMethodsConsideringUncertainty-Presentation-508-UCRO.pdf Long-Term Hydrologic Projections for the Colorado River Basin and Methods for Considering Uncertainty]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-06-17-twg-meeting/20210617-ColoradoRiverBasinApril20215-yearProjectedFutureConditions-508-UCRO.pdf Colorado River Basin April 2021 5-year Projected Future Conditions ]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-06-17-twg-meeting/20210617-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2021-05-19-amwg-meeting/20210519-BasinHydrologyOperation-Presentation-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-04-14-twg-meeting/20210414-UpdateHydrologyOperationsWaterQualityConditions-508-UCRO.pdf Update on Hydrology, Operations and Water Quality Conditions ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2021-02-11-amwg-meeting/20210211-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-01-22-twg-meeting/20210122-BasinHydrologyOperations-508-UCRO.pdf Basin Hydrology and Operations ]

'''2020'''
*[https://www.usbr.gov/uc/progact/amp/twg/2020-10-15-twg-meeting/20201015-OpsHydrologyTWG-508.pdf TWG Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2020-08-20-amwg-meeting/20200820-BasinHydrologyReservoirOperations2020-2021Hydrograph-Presentation-508-UCRO.pdf Basin Hydrology, Reservoir Operations 2020 and 2021 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/twg/2020-06-24-twg-meeting/20200624-HydrologyOperationsReservoirRelease-508-UCRO.pdf Hydrology, Operations and Reservoir Release presentation ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2020-05-20-amwg-meeting/20200520-AMWG-HydrologyOperationsReservoirRelease-508-UCRO.pdf Hydrology, Operations and Reservoir Release presentation ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2020-02-12-amwg-meeting/20200212-AMWG-HydrologyOperationsReservoirRelease-Presentation-508-UCRO.pdf Hydrology, Operations and Reservoir Release]

'''2019'''
*[https://www.usbr.gov/uc/progact/amp/twg/2019-10-21-twg-meeting/20191021-BasinHydrologyReservoirOperations2020Hydrograph-Presentation-508-UCRO.pdf Basin Hydrology, Reservoir Operations and 2020 Hydrograph Presentation ]

'''2018'''
*[http://www.yumaheritage.com/docs/2nd-A-1JackSchmidt_USU_LoganUT.pdf?bcsi_scan_16614fa24ff8c4a5=0&bcsi_scan_filename=2nd-A-1JackSchmidt_USU_LoganUT.pdf Urban Waterfronts 2018]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-10-10-twg-meeting/Attach_06.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2018-08-22-amwg-meeting/Attach_02.pdf Basin Hydrology, Reservoir Operations 2018 and 2019 Hydrograph]
*[https://qcnr.usu.edu/wats/colorado_river_studies/files/documents/Udall.pdf How Will the Colorado Run? The Colorado River in a Warmer World]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-06-25-twg-meeting/Attach_04.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2018-05-22-amwg-meeting/Attach_02.pdf Basin Hydrology, Reservoir Operations 2018 and 2019 Hydrograph PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-04-23-twg-meeting/Attach_13.pdf The 21st Century Colorado River Hot Drought and Implications for the Future PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-04-23-twg-meeting/Attach_06.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2018-02-14-amwg-meeting/Attach_03.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-01-25-twg-meeting/AR21.pdf Basin Hydrology, Operations and 2018 Hydrograph PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-01-25-twg-meeting/Attach_04.pdf Basin Hydrology, Water Years 2018-2019 Operations PPT]

'''2017'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2017-02-15-amwg-meeting/Attach_16.pdf Analysis of Water Losses and Impacts to the Grand Canyon Ecosystem of the "Fill Mead First" Proposal]
*[https://qcnr.usu.edu/wats/colorado_river_studies/files/documents/Fill_Mead_First_Exec_Summary.pdf Fill Mead First: A technical assessment (Summary)]
*[https://qcnr.usu.edu/wats/colorado_river_studies/files/documents/Fill_Mead_First_Analysis.pdf Fill Mead First: A technical assessment (Analysis)]
*[https://www.usbr.gov/uc/progact/amp/twg/2017-04-20-twg-meeting/Attach_03.pdf Basin Hydrology and Operations]
*[[Media:Feb2017 OperationsCall.pdf| February 2017 Glen Canyon Montly Operational Coordination Call]]
*[https://www.usbr.gov/uc/progact/amp/amwg/2017-02-15-amwg-meeting/Attach_05.pdf Basin Hydrology, and 2017-2018 Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2017-02-15-amwg-meeting/Attach_16.pdf Analysis of Water Losses and Impacts to the Grand Canyon Ecosystem of the "Fill Mead First" Proposal and PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2017-01-26-twg-meeting/A6_Davidson.pdf Basin Hydrology, Operations and 2018 Hydrograph]

'''2016'''
*[[Media:Aug2016 Information.pdf| August 2016 DOI-DOE Federal Family call on Glen Canyon Operations ]]
*[https://qcnr.usu.edu/coloradoriver/news/wp1.php Fill Mead First – A Technical Assessment]
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-08-24-amwg-meeting/Attach_05.pdf Basin Hydrology and Water Year (WY) 2017 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-05-25-amwg-meeting/Attach_02.pdf Basin Hydrology, Operations, and 2017 Hydrograph]
*[[Media:2017 Hydrology PPT.pdf| TWG: Basin Hydrology, Operations, and 2017 Hydrograph]]
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-02-24-amwg-meeting/Attach_08.pdf Basin Hydrology, Operations, and 2017 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/Attach_03.pdf Glen Canyon Dam Operations During Equalization]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/AR01_Topping.pdf Project 2: Streamflow, Water Quality, Sediment Transport, and Sand Budgets in the Colorado River Ecosystem]

'''2015'''
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGMHhacTF4enJ1eGs/view 2016 Annual Operating Plan]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGTU41NkhzUi1ZTTg/view California Drought Monitor]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGOVVVUXFhZVBvNmM/view Lake Mead Issues and Lower Basin Shortage Preparedness]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGbDNmN3FOeW05b3c/view Lake Mead Issues and Lower Basin Shortage Preparedness - Presentation]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGbmRuSzRqVm5ydHc/view Basin Hydrology Operations, and 2016 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-06-11-twg-meeting/Attach_04.pdf Basin Hydrology Operations, and 2016 Hydrograph]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGMHhacTF4enJ1eGs/view 2016 Annual Operating Plan]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-05-28-amwg-meeting/Attach_05.pdf Basin Hydrology and WY 2016 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-04-21-twg-meeting/Attach_03.pdf Hydrology Update and 2016 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-04-21-twg-meeting/Attach_07.pdf Water Quality in Lake Mead and Upstream Influences: Dissolved Oxygen during 2014]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_02.pdf Basin Hydrology, Operations, and 2016 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03a.pdf Panel on Current Projects and Issues in Utah]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03b.pdf Central Utah Project]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03c.pdf Meeting the Mitigation Requirement for the Bonneville Unit CUP]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03d.pdf Current Projects and Issues in Utah]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_03e.pdf Provo Area Office]

'''2014'''
*[https://www.usbr.gov/uc/progact/amp/twg/2014-10-28-twg-meeting/Attach_09.pdf Colorado River Annual Operating Plan and Drought Contingency Planning ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-08-27-amwg-meeting/Attach_02b.pdf DOI-DOE Hydrograph Development for Water Year 2015 ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-08-27-amwg-meeting/Attach_02a.pdf Basin Hydrology, Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2014-06-24-twg-meeting/Attach_06a.pdf Basin Hydrology, Operations, and 2015 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-05-27-amwg-meeting/Attach_01.pdf Basin Hydrology, Operations, and 2015 Hydrograph and AIF: Development of Water Year 2015 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-02-19-amwg-meeting/Attach_02.pdf Basin Hydrology, Operations, and 2015 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-02-19-amwg-meeting/Attach_03a.pdf Panel on the Potential Effects of Long-Term Drought on Colorado River Operations ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-02-19-amwg-meeting/Attach_03b.pdf Near Term Risks: Options to Address Declining Reservoirs ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-02-19-amwg-meeting/Attach_03c.pdf State of Nevada Concerns ]

'''2013'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-08-08-amwg-meeting/Attach_04.pdf Water Year 2014 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-08-08-amwg-meeting/Attach_03.pdf Basin Hydrology and Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-06-26-twg-meeting/Attach_04.pdf Colorado River Basin Hydrology and Projected Glen Canyon Dam Operations ]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-06-26-twg-meeting/Attach_05a.pdf DOI/DOE FY14 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-06-26-twg-meeting/Attach_05b.pdf Approved FY14 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-02-20-amwg-meeting/Attach_04.pdf Glen Canyon Dam Facility Management]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-02-20-amwg-meeting/Attach_02.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-02-20-amwg-meeting/Attach_03.pdf Colorado River Basin Water Supply and Demand Study]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-01-24-twg-meeting/Attach_05.pdf Executive Summary--Pre-Production Copy of the Colorado River Basin Water Supply and Demand Study]
*[https://www.usbr.gov/lc/region/programs/crbstudy/finalreport/index.html Colorado River Basin Water Study & Demand Study - Final Study Reports]

'''2012'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-08-29-amwg-meeting/Attach_03.pdf Basin Hydrology ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-08-29-amwg-meeting/Attach_06a.pdf Water Year 2013 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-08-29-amwg-meeting/Attach_06b.pdf TWG Report: 2013 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/twg/2012-06-20-twg-meeting/Attach_04a.pdf DOI and DOE Operating Hydrograph Recommendations for GCD (2012 water year)]
*[https://www.usbr.gov/uc/progact/amp/twg/2012-06-20-twg-meeting/Attach_04b.pdf Water Year 2013 Hydrograph TWG Motion ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Attach_05.pdf 2013 Hydrograph Development ]
*[https://www.usbr.gov/uc/progact/amp/twg/2012-02-02-twg-meeting/Attach_07.pdf FY2013 Hydrograph (from 8/2011 AMWG meeting)]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Attach_09.pdf Basin Hydrology and Operations ]
*[https://www.gcmrc.gov/about/ka/KA%202%20-%2010-19-11/AM%20Talks/Grams%20Flow%20Temp%20Turbidity.pdf Flow Temp Turbidity ]

'''2011'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-08-24-amwg-meeting/Attach_09.pdf 2012 Hydrograph ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-08-24-amwg-meeting/Attach_08.pdf Basin Hydrology ]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-06-28-twg-meeting/Attach_06a.pdf 2012 Hydrograph Development ]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-06-28-twg-meeting/Attach_06b.pdf Department of the Interior and Department of Energy Operating Hydrograph Recommendations for Glen Canyon Dam (2012 Water Year), June 6, 2011]
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-05-18-amwg-meeting/Attach_03.pdf Basin Hydrology ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-05-18-amwg-meeting/Attach_10.pdf Secure Water Act Section 9503 (c) - Water and Climate Change]
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-05-18-amwg-meeting/Attach_04.pdf WY2012 Hydrograph Development ]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-03-08-twg-meeting/Attach_05a.pdf 2012 Hydrograph Development ]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-03-08-twg-meeting/Attach_05b.pdf Grand Canyon Trust Proposed FY2012 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-01-20-twg-meeting/Attach_04a.pdf Bureau of Reclamation Updates ]

'''2010'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07a.pdf Fiscal Year 2011-12 Hydrograph and E-mail Message to the AMWG from Anne Castle Dated July 23, 2010, Subject: July 23 Final Draft DOI-DOE Proposed Hydrograph Recommendations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07b.pdf Department of the Interior and Department of the Energy Recommendations for Glen Canyon Dam with August 23, 2010, edits]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07c.pdf Grand Canyon Protection Act]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07d.pdf Report on Modeling the 2008-2010 Period to Support Development of the 2011 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07e.pdf Proposed Water year 2011 Hydrograph: Impacts on CRSP Electric Power Resources]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_07f.pdf Grand Canyon Trust Hydrograph Proposal]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_06.pdf Basin Hydrology and Operations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-02-03-amwg-meeting/Attach_12.pdf Basin Hydrology and PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2010-01-21-twg-meeting/Attach_03b.pdf Figure 1, AOP, BOR, AMWG monthly volumes]

'''2009'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-08-12-amwg-meeting/Attach_08a.pdf FY2010-11 Draft Budget, Workplan, and Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-08-12-amwg-meeting/Attach_08b.pdf Basin Hydrology PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-04-29-amwg-meeting/Attach_11.pdf Basin Hydrology and PPT]

*[http://www.riversimulator.org/Resources/AquaticResearch/MLFFfailureKorman2004.pdf ***DRAFT*** Evidence for the Failure of the Modified Low Fluctuating Flow Alternative (MLFFA) to Benefit Most Ecological Resources in Grand Canyon ]
*[https://pubs.usgs.gov/of/2006/1243/pdf/of06-1243_508.pdf Hazel et al. 2006. Stage-Discharge Relations for the Colorado River in Glen, Marble, and Grand Canyons, Arizona: U.S. Geological Survey Open-File Report 2006-1243, 7 p]
*[https://pubs.usgs.gov/pp/pp1677/pdf/pp1677.pdf Topping et al. 2003. Computation and analysis of the instantaneous-discharge record for the Colorado River at Lees Ferry, Arizona, May 8, 1921 through September 30, 2000: U.S. Geological Survey Professional Paper 1677, 118 p.]

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<Span></Span>

TCD Learning Page

2026-10-13T15:42:26Z

Cellsworth:

TCD Learning Page

2026-10-13T15:32:27Z

Cellsworth:

GCDAMP History Time-Line -Years

2026-09-29T21:51:02Z

Cellsworth:

__NOTOC__
==2027==
*LTEMP 10-Year Review

==2026==
*Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]
*Bright Angel creek floods from monsoon rains on the Dragon-Bravo fire scar

==2025==
*Razorback suckers stocked into the Little Colorado River (2023-2025)
*The [https://gcdamp.com/index.php/The_-12_Mile_Slough -12 Mile Slough] gets renovated
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass
*Dragon-Bravo fire burns on the North Rim

==2024==
*Razorback suckers stocked into the Little Colorado River (2023-2025)
*[https://gcdamp.com/index.php/Humpback_Chub_Page Humpback chub] population in Grand Canyon grows to 70,000 adults (40,000–200,000; 95% credible interval)
*The LTEMP EIS is modified to allow for releases to control smallmouth bass and to modify the sediment accounting windows for HFEs
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2023==
*Razorback suckers stocked into the Little Colorado River (2023-2025)
*[[The 2023 Spring HFE| Spring HFE: 39,500 cfs for 72h]]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)
*Bill Stewart becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2022==
*Release temperatures at Glen Canyon Dam reach 20.5C with low reservoir elevations
*Balancing releases May - September
*[[A 2022 Fall HFE| A Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)

==2021==
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow Spring Disturbance Flow]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)
*Andrew Schultz becomes GCMRC Chief

==2020==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)
*COVID moves all meetings for the year to remote
*Wayne Pullan becomes direction of Reclamation's Upper Colorado River Region
*Ed Keable becomes superintendent of Grand Canyon National Park

==2019==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://www.usbr.gov/uc/progact/amp/amwg/2019-08-21-amwg-meeting/20190821-GlenCanyonDamAdaptiveManagementProgramGuidance-508-UCRO.pdf DOI Guidance from Dr. Tim Petty]
*Brent Esplin becomes direction of Reclamation's Upper Colorado River Region
*Lee Traynham becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2018==
*[[The 2018 Fall HFE| Fall HFE]]: 38,100 cfs for 60h
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2017==
*[https://gcdamp.com/index.php/2017_Knowledge_Assessment 2017 Knowledge Assessment]
*Ryan Zinke becomes Secretary of the Interior

==2016==
*Publication of the [https://gcdamp.com/index.php/Long-term_Experimental_and_Management_Plan_(LTEMP) LTEMP EIS]
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2015==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] and [https://gcdamp.com/index.php/Green_Sunfish_Page green sunfish] start reproducing in Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of Triennial Budget and Workplans
*Brent Rhees becomes direction of Reclamation's Upper Colorado River Region
*Scott VanderKooi becomes GCMRC Chief

==2014==
*Rainbow trout fishery collapses at Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 Fall HFE]: 37,500 cfs for 96h
*Galahad Point fire and flood eliminates the humpback chub translocation in Shinumo Creek

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 Fall HFE]: 34,100 cfs for 96h
*Sally Jewell becomes Secretary of the Interior

==2012==
*[https://gcdamp.com/index.php/Portal:Desired_Future_Conditions_-DFCs Development of the Desired Future Conditions (DFCs)]
*Publication of the [https://gcdamp.com/index.php/The_HFE_Page High Flow Experiment Protocol]
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*The 2011 Equalization releases from March - December
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]
*Start of Biennial Budget and Workplans
*Jack Schmidt becomes GCMRC Chief
*Dave Uberuaga becomes Superintendent of GCNP

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Glen Knowles becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Ken Salazar becomes Secretary of the Interior
*Anne Castle becomes Assistant Secretary for Water and Science

==2008==
*USFWS Biological Opinion identifies concerns with constructing a [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)] that can only release warm water
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs Spring HFE], 41,500 cfs for 60 hours
*Grand Canyon Trust files suit against USBR, USFWS, and others contending operations at Glen Canyon Dam ran counter to their obligations to comply with the ESA, NEPA, and Administrative Policy Act
*GCDAMP budget was capped

==2007==
*[http://www.riversimulator.org/Resources/USBR/LTEP/Randle2007.pdf Appraisal study on sediment augmentation]
*Pearce Ferry Rapid forms creating a non-navigable barrier for downstream rafting and barrier for upstream fish movement from Lake Mead
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]
*Larry Walkoviak becomes direction of Reclamation's Upper Colorado River Region
*Steve Martin becomes superintendent of GCNP

==2006==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Draft Long-Term Experimental Plan Environmental Plan (LTEP)
*Dirk Kempthorne becomes Secretary of the Interior

==2005==
*[https://pubs.usgs.gov/circ/1282/c1282.pdf SCORE Report: The State of the Colorado River Ecosystem in Grand Canyon]
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Fluctuating trout suppression flows from January through March (2003-2005)

==2004==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*[https://pubs.usgs.gov/fs/2011/3012/ 2004 Fall HFE], 41,000 cfs for 60 hours
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]
*Fluctuating trout suppression flows from January through March (2003-2005)

==2003==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Fluctuating trout suppression flows from January through March (2003-2005)

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 years of an experimental design proposed by the GCMRC.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish
*Draft GCDAMP Strategic Plan for the developed by program managers.
*Gale Norton becomes Secretary of the Interior
*GCMRC moves from the office of the Assistant Secretary of the Interior to the US Geological Survey

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.
*Rick Gold becomes direction of Reclamation's Upper Colorado River Region

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP
*[https://gcdamp.com/images_gcdamp_com/6/62/Appendix_B_%28Guidance_Document%29_Loveless.doc Glen Canyon Dam Adaptive Management Program AMWG FACA Committee Guidance (The 1999 Loveless Document)]
*Dennis Kubly becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1998==
*GCMRC is moved from USBR to the office of the Assistant Secretary of the Department of the Interior
*Barry Gold becomes acting GCRMC Chief

==1997==
*AMWG and TWG fully established
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*Formation of a GCDAMP Strategic Planning Subcommittee (1997-2000)
*Reclamation begins a Value Planning Study for a warm-water [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)]
*[[The 1997 Habitat Maintenance Flow (HMF)|1997 Habitat Maintenance Flow (HMF)]]
*Mary Orton joins AMWG as mediator
*Bruce Moore becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1996==
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement selects Modified Low Fluctuating Flows (MLFF) as the preferred alternative.
*[[The 1996 Spring HFE| 1996 Beach/Habitat-Building Flow (BHBF)]], 45,000 cfs for 168 hours
*Dave Garrett becomes first GCMRC Chief

==1995==
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)
*Establishment of the Grand Canyon Monitoring and Research Center (GCMRC)
*The Glen Canyon Dam Environmental Impact Statement as required by the Grand Canyon Protection Act is completed.
*The Grand Canyon National Park General Management Plan

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]
*Charley Calhoun becomes direction of Reclamation's Upper Colorado River Region

==1993==
*Bruce Babbitt becomes Secretary of the Interior
*Dan Beard becomes USBR Commissioner

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act ]

==1991==
*Interim operating criteria for Glen Canyon Dam implemented with what would become MLFF-like releases
*The [https://pubs.usgs.gov/publication/ds246 1990-91 Research Flows]
*Razorback Sucker and Kanab Ambersnail federally listed as endangered

==1990==
*Beginning of Interim Operating Criteria
*The [https://pubs.usgs.gov/publication/ds246 1990-91 Research Flows]
*Formulative discussions on the concept of HFEs begin lead by Duncan Patton

==1989==
*Manuel Lujan becomes Secretary of the Interior and orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem
*Roland Robison becomes direction of Reclamation's Upper Colorado River Region

==1988==
*Salt Lake City Area Integrated Projects(CRSP) passed after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1984 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1981==
*Cliff Barrett becomes direction of Reclamation's Upper Colorado River Region

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1975==
*Grand Canyon National Park Enlargement Act passed

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1972==
*Last verified record of [https://gcdamp.com/index.php/Colorado_Pikeminnow Colorado Pikeminnow] caught in Grand Canyon at Havasu Creek

==1971==

==1970==
*[https://www.usbr.gov/lc/region/pao/pdfiles/opcriter.pdf Long-range Operating Criteria (LROC)] developed for Glen Canyon Dam operations

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1968==
*Colorado River Basin Project Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1966==
*National Historic Preservation Act passed
*Crystal rapid forms after a large flash flood from Crystal Creek

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1963==
*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Court held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1935 ==
*Hoover Dam completed

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” ]

== 1919 ==
*Grand Canyon National Park created

== 1916 ==
*National Park Service Organic Act passed

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1869 ==
*Major John Wesley Powell leads first recorded expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

==*11,000 BP==
*Paleo-Indian peoples occupy Grand Canyon region

GCDAMP History Time-Line -Years

2026-09-29T21:50:29Z

Cellsworth:

__NOTOC__
==2027==
*LTEMP 10-Year Review

==2026==
*Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]
*Bright Angel creek floods from monsoon rains on the Dragon-Bravo fire scar

==2025==
*Razorback suckers stocked into the Little Colorado River (2023-2025)
*The [https://gcdamp.com/index.php/The_-12_Mile_Slough -12 Mile Slough] gets renovated
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass
*Dragon-Bravo fire burns on the North Rim

==2024==
*Razorback suckers stocked into the Little Colorado River (2023-2025)
*[https://gcdamp.com/index.php/Humpback_Chub_Page Humpback chub] population in Grand Canyon grows to 70,000 adults (40,000–200,000; 95% credible interval)
*The LTEMP EIS is modified to allow for releases to control smallmouth bass and to modify the sediment accounting windows for HFEs
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2023==
*Razorback suckers stocked into the Little Colorado River (2023-2025)
*[[The 2023 Spring HFE| Spring HFE: 39,500 cfs for 72h]]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)
*Bill Stewart becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2022==
*Release temperatures at Glen Canyon Dam reach 20.5C with low reservoir elevations
*Balancing releases May - September
*[[A 2022 Fall HFE| A Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)

==2021==
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow Spring Disturbance Flow]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)
*Andrew Schultz becomes GCMRC Chief

==2020==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)
*COVID moves all meetings for the year to remote
*Wayne Pullan becomes direction of Reclamation's Upper Colorado River Region
*Ed Keable becomes superintendent of Grand Canyon National Park

==2019==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://www.usbr.gov/uc/progact/amp/amwg/2019-08-21-amwg-meeting/20190821-GlenCanyonDamAdaptiveManagementProgramGuidance-508-UCRO.pdf DOI Guidance from Dr. Tim Petty]
*Brent Esplin becomes direction of Reclamation's Upper Colorado River Region
*Lee Traynham becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2018==
*[[The 2018 Fall HFE| Fall HFE]]: 38,100 cfs for 60h
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2017==
*[https://gcdamp.com/index.php/2017_Knowledge_Assessment 2017 Knowledge Assessment]
*Ryan Zinke becomes Secretary of the Interior

==2016==
*Publication of the [https://gcdamp.com/index.php/Long-term_Experimental_and_Management_Plan_(LTEMP) LTEMP EIS]
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2015==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] and [https://gcdamp.com/index.php/Green_Sunfish_Page green sunfish] start reproducing in Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of Triennial Budget and Workplans
*Brent Rhees becomes direction of Reclamation's Upper Colorado River Region
*Scott VanderKooi becomes GCMRC Chief

==2014==
*Rainbow trout fishery collapses at Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 Fall HFE]: 37,500 cfs for 96h
*Galahad Point fire and flood eliminates the humpback chub translocation in Shinumo Creek

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 Fall HFE]: 34,100 cfs for 96h
*Sally Jewell becomes Secretary of the Interior

==2012==
*[https://gcdamp.com/index.php/Portal:Desired_Future_Conditions_-DFCs Development of the Desired Future Conditions (DFCs)]
*Publication of the [https://gcdamp.com/index.php/The_HFE_Page High Flow Experiment Protocol]
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*The 2011 Equalization releases from March - December
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]
*Start of Biennial Budget and Workplans
*Jack Schmidt becomes GCMRC Chief
*Dave Uberuaga becomes Superintendent of GCNP

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Glen Knowles becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Ken Salazar becomes Secretary of the Interior
*Anne Castle becomes Assistant Secretary for Water and Science

==2008==
*USFWS Biological Opinion identifies concerns with constructing a [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)] that can only release warm water
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs Spring HFE], 41,500 cfs for 60 hours
*Grand Canyon Trust files suit against USBR, USFWS, and others contending operations at Glen Canyon Dam ran counter to their obligations to comply with the ESA, NEPA, and Administrative Policy Act
*GCDAMP budget was capped

==2007==
*[http://www.riversimulator.org/Resources/USBR/LTEP/Randle2007.pdf Appraisal study on sediment augmentation]
*Pearce Ferry Rapid forms creating a non-navigable barrier for downstream rafting and barrier for upstream fish movement from Lake Mead
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]
*Larry Walkoviak becomes direction of Reclamation's Upper Colorado River Region
*Steve Martin becomes superintendent of GCNP

==2006==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Draft Long-Term Experimental Plan Environmental Plan (LTEP)
*Dirk Kempthorne becomes Secretary of the Interior

==2005==
*[https://pubs.usgs.gov/circ/1282/c1282.pdf SCORE Report: The State of the Colorado River Ecosystem in Grand Canyon]
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Fluctuating trout suppression flows from January through March (2003-2005)

==2004==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*[https://pubs.usgs.gov/fs/2011/3012/ 2004 Fall HFE], 41,000 cfs for 60 hours
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]
*Fluctuating trout suppression flows from January through March (2003-2005)

==2003==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Fluctuating trout suppression flows from January through March (2003-2005)

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 years of an experimental design proposed by the GCMRC.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish
*Draft GCDAMP Strategic Plan for the developed by program managers.
*Gale Norton becomes Secretary of the Interior
*GCMRC moves from the office of the Assistant Secretary of the Interior to the US Geological Survey

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.
*Rick Gold becomes direction of Reclamation's Upper Colorado River Region

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP
*[https://gcdamp.com/images_gcdamp_com/6/62/Appendix_B_%28Guidance_Document%29_Loveless.doc Glen Canyon Dam Adaptive Management Program AMWG FACA Committee Guidance (The 1999 Loveless Document)]
*Dennis Kubly becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1998==
*GCMRC is moved from USBR to the office of the Assistant Secretary of the Department of the Interior
*Barry Gold becomes acting GCRMC Chief

==1997==
*AMWG and TWG fully established
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*Formation of a GCDAMP Strategic Planning Subcommittee (1997-2000)
*Reclamation begins a Value Planning Study for a warm-water [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)]
*[[The 1997 Habitat Maintenance Flow (HMF)|1997 Habitat Maintenance Flow (HMF)]]
*Mary Orton joins AMWG as mediator
*Bruce Moore becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1996==
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement selects Modified Low Fluctuating Flows (MLFF) as the preferred alternative.
*[[The 1996 Spring HFE| 1996 Beach/Habitat-Building Flow (BHBF)]], 45,000 cfs for 168 hours
*Dave Garrett becomes first GCMRC Chief

==1995==
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)
*Establishment of the Grand Canyon Monitoring and Research Center (GCMRC)
*The Glen Canyon Dam Environmental Impact Statement as required by the Grand Canyon Protection Act is completed.
*The Grand Canyon National Park General Management Plan

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]
*Charley Calhoun becomes direction of Reclamation's Upper Colorado River Region

==1993==
*Bruce Babbitt becomes Secretary of the Interior
*Dan Beard becomes USBR Commissioner

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act ]

==1991==
*Interim operating criteria for Glen Canyon Dam implemented with what would become MLFF-like releases
*The [https://pubs.usgs.gov/publication/ds246 1990-91 Research Flows]
*Razorback Sucker and Kanab Ambersnail federally listed as endangered

==1990==
*Beginning of Interim Operating Criteria
*The 1990-91 Experimental Flows
*Formulative discussions on the concept of HFEs begin lead by Duncan Patton

==1989==
*Manuel Lujan becomes Secretary of the Interior and orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem
*Roland Robison becomes direction of Reclamation's Upper Colorado River Region

==1988==
*Salt Lake City Area Integrated Projects(CRSP) passed after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1984 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1981==
*Cliff Barrett becomes direction of Reclamation's Upper Colorado River Region

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1975==
*Grand Canyon National Park Enlargement Act passed

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1972==
*Last verified record of [https://gcdamp.com/index.php/Colorado_Pikeminnow Colorado Pikeminnow] caught in Grand Canyon at Havasu Creek

==1971==

==1970==
*[https://www.usbr.gov/lc/region/pao/pdfiles/opcriter.pdf Long-range Operating Criteria (LROC)] developed for Glen Canyon Dam operations

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1968==
*Colorado River Basin Project Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1966==
*National Historic Preservation Act passed
*Crystal rapid forms after a large flash flood from Crystal Creek

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1963==
*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Court held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1935 ==
*Hoover Dam completed

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” ]

== 1919 ==
*Grand Canyon National Park created

== 1916 ==
*National Park Service Organic Act passed

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1869 ==
*Major John Wesley Powell leads first recorded expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

==*11,000 BP==
*Paleo-Indian peoples occupy Grand Canyon region

Glen Canyon Dam Adaptive Management ADMINISTRATIVE HISTORY

2026-09-29T20:00:47Z

Cellsworth:

Glen Canyon Dam Adaptive Management ADMINISTRATIVE HISTORY

2026-09-29T19:53:04Z

Cellsworth:

GCDAMP History Time-Line -Years

2026-09-29T18:43:26Z

Cellsworth:

__NOTOC__
==2027==
*LTEMP 10-Year Review

==2026==
*Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]
*Bright Angel creek floods from monsoon rains on the Dragon-Bravo fire scar

==2025==
*Razorback suckers stocked into the Little Colorado River (2023-2025)
*The [https://gcdamp.com/index.php/The_-12_Mile_Slough -12 Mile Slough] gets renovated
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass
*Dragon-Bravo fire burns on the North Rim

==2024==
*Razorback suckers stocked into the Little Colorado River (2023-2025)
*[https://gcdamp.com/index.php/Humpback_Chub_Page Humpback chub] population in Grand Canyon grows to 70,000 adults (40,000–200,000; 95% credible interval)
*The LTEMP EIS is modified to allow for releases to control smallmouth bass and to modify the sediment accounting windows for HFEs
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2023==
*Razorback suckers stocked into the Little Colorado River (2023-2025)
*[[The 2023 Spring HFE| Spring HFE: 39,500 cfs for 72h]]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)
*Bill Stewart becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2022==
*Release temperatures at Glen Canyon Dam reach 20.5C with low reservoir elevations
*Balancing releases May - September
*[[A 2022 Fall HFE| A Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)

==2021==
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow Spring Disturbance Flow]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)
*Andrew Schultz becomes GCMRC Chief

==2020==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)
*COVID moves all meetings for the year to remote
*Wayne Pullan becomes direction of Reclamation's Upper Colorado River Region
*Ed Keable becomes superintendent of Grand Canyon National Park

==2019==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://www.usbr.gov/uc/progact/amp/amwg/2019-08-21-amwg-meeting/20190821-GlenCanyonDamAdaptiveManagementProgramGuidance-508-UCRO.pdf DOI Guidance from Dr. Tim Petty]
*Brent Esplin becomes direction of Reclamation's Upper Colorado River Region
*Lee Traynham becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2018==
*[[The 2018 Fall HFE| Fall HFE]]: 38,100 cfs for 60h
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2017==
*[https://gcdamp.com/index.php/2017_Knowledge_Assessment 2017 Knowledge Assessment]
*Ryan Zinke becomes Secretary of the Interior

==2016==
*Publication of the [https://gcdamp.com/index.php/Long-term_Experimental_and_Management_Plan_(LTEMP) LTEMP EIS]
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2015==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] and [https://gcdamp.com/index.php/Green_Sunfish_Page green sunfish] start reproducing in Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of Triennial Budget and Workplans
*Brent Rhees becomes direction of Reclamation's Upper Colorado River Region
*Scott VanderKooi becomes GCMRC Chief

==2014==
*Rainbow trout fishery collapses at Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 Fall HFE]: 37,500 cfs for 96h
*Galahad Point fire and flood eliminates the humpback chub translocation in Shinumo Creek

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 Fall HFE]: 34,100 cfs for 96h
*Sally Jewell becomes Secretary of the Interior

==2012==
*[https://gcdamp.com/index.php/Portal:Desired_Future_Conditions_-DFCs Development of the Desired Future Conditions (DFCs)]
*Publication of the [https://gcdamp.com/index.php/The_HFE_Page High Flow Experiment Protocol]
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*The 2011 Equalization releases from March - December
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]
*Start of Biennial Budget and Workplans
*Jack Schmidt becomes GCMRC Chief
*Dave Uberuaga becomes Superintendent of GCNP

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Glen Knowles becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Ken Salazar becomes Secretary of the Interior
*Anne Castle becomes Assistant Secretary for Water and Science

==2008==
*USFWS Biological Opinion identifies concerns with constructing a [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)] that can only release warm water
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs Spring HFE], 41,500 cfs for 60 hours
*Grand Canyon Trust files suit against USBR, USFWS, and others contending operations at Glen Canyon Dam ran counter to their obligations to comply with the ESA, NEPA, and Administrative Policy Act
*GCDAMP budget was capped

==2007==
*[http://www.riversimulator.org/Resources/USBR/LTEP/Randle2007.pdf Appraisal study on sediment augmentation]
*Pearce Ferry Rapid forms creating a non-navigable barrier for downstream rafting and barrier for upstream fish movement from Lake Mead
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]
*Larry Walkoviak becomes direction of Reclamation's Upper Colorado River Region
*Steve Martin becomes superintendent of GCNP

==2006==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Draft Long-Term Experimental Plan Environmental Plan (LTEP)
*Dirk Kempthorne becomes Secretary of the Interior

==2005==
*[https://pubs.usgs.gov/circ/1282/c1282.pdf SCORE Report: The State of the Colorado River Ecosystem in Grand Canyon]
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Fluctuating trout suppression flows from January through March (2003-2005)

==2004==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*[https://pubs.usgs.gov/fs/2011/3012/ 2004 Fall HFE], 41,000 cfs for 60 hours
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]
*Fluctuating trout suppression flows from January through March (2003-2005)

==2003==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Fluctuating trout suppression flows from January through March (2003-2005)

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 years of an experimental design proposed by the GCMRC.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish
*Draft GCDAMP Strategic Plan for the developed by program managers.
*Gale Norton becomes Secretary of the Interior
*GCMRC moves from the office of the Assistant Secretary of the Interior to the US Geological Survey

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.
*Rick Gold becomes direction of Reclamation's Upper Colorado River Region

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP
*[https://gcdamp.com/images_gcdamp_com/6/62/Appendix_B_%28Guidance_Document%29_Loveless.doc Glen Canyon Dam Adaptive Management Program AMWG FACA Committee Guidance (The 1999 Loveless Document)]
*Dennis Kubly becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1998==
*GCMRC is moved from USBR to the office of the Assistant Secretary of the Department of the Interior
*Barry Gold becomes acting GCRMC Chief

==1997==
*AMWG and TWG fully established
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*Formation of a GCDAMP Strategic Planning Subcommittee (1997-2000)
*Reclamation begins a Value Planning Study for a warm-water [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)]
*[[The 1997 Habitat Maintenance Flow (HMF)|1997 Habitat Maintenance Flow (HMF)]]
*Mary Orton joins AMWG as mediator
*Bruce Moore becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1996==
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement selects Modified Low Fluctuating Flows (MLFF) as the preferred alternative.
*[[The 1996 Spring HFE| 1996 Beach/Habitat-Building Flow (BHBF)]], 45,000 cfs for 168 hours
*Dave Garrett becomes first GCMRC Chief

==1995==
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)
*Establishment of the Grand Canyon Monitoring and Research Center (GCMRC)
*The Glen Canyon Dam Environmental Impact Statement as required by the Grand Canyon Protection Act is completed.
*The Grand Canyon National Park General Management Plan

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]
*Charley Calhoun becomes direction of Reclamation's Upper Colorado River Region

==1993==
*Bruce Babbitt becomes Secretary of the Interior
*Dan Beard becomes USBR Commissioner

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act ]

==1991==
*Interim operating criteria for Glen Canyon Dam implemented
*The 1990-91 Experimental Flows
*Razorback Sucker and Kanab Ambersnail federally listed as endangered

==1990==
*Beginning of Interim Operating Criteria
*The 1990-91 Experimental Flows
*Formulative discussions on the concept of HFEs begin lead by Duncan Patton

==1989==
*Manuel Lujan becomes Secretary of the Interior and orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem
*Roland Robison becomes direction of Reclamation's Upper Colorado River Region

==1988==
*Salt Lake City Area Integrated Projects(CRSP) passed after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1984 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1981==
*Cliff Barrett becomes direction of Reclamation's Upper Colorado River Region

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1975==
*Grand Canyon National Park Enlargement Act passed

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1972==
*Last verified record of [https://gcdamp.com/index.php/Colorado_Pikeminnow Colorado Pikeminnow] caught in Grand Canyon at Havasu Creek

==1971==

==1970==
*[https://www.usbr.gov/lc/region/pao/pdfiles/opcriter.pdf Long-range Operating Criteria (LROC)] developed for Glen Canyon Dam operations

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1968==
*Colorado River Basin Project Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1966==
*National Historic Preservation Act passed
*Crystal rapid forms after a large flash flood from Crystal Creek

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1963==
*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Court held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1935 ==
*Hoover Dam completed

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” ]

== 1919 ==
*Grand Canyon National Park created

== 1916 ==
*National Park Service Organic Act passed

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1869 ==
*Major John Wesley Powell leads first recorded expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

==*11,000 BP==
*Paleo-Indian peoples occupy Grand Canyon region

GCDAMP History Time-Line -Years

2026-09-29T18:33:02Z

Cellsworth:

__NOTOC__
==2027==
*LTEMP 10-Year Review

==2026==
*Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]
*Bright Angel creek floods from monsoon rains on the Dragon-Bravo fire scar

==2025==
*Razorback suckers stocked into the Little Colorado River (2023-2025)
*The [https://gcdamp.com/index.php/The_-12_Mile_Slough -12 Mile Slough] gets renovated
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass
*Dragon-Bravo fire burns on the North Rim

==2024==
*Razorback suckers stocked into the Little Colorado River (2023-2025)
*[https://gcdamp.com/index.php/Humpback_Chub_Page Humpback chub] population in Grand Canyon grows to 70,000 adults (40,000–200,000; 95% credible interval)
*The LTEMP EIS is modified to allow for releases to control smallmouth bass and to modify the sediment accounting windows for HFEs
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2023==
*Razorback suckers stocked into the Little Colorado River (2023-2025)
*[[The 2023 Spring HFE| Spring HFE: 39,500 cfs for 72h]]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)
*Bill Stewart becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2022==
*Release temperatures at Glen Canyon Dam reach 20.5C with low reservoir elevations
*Balancing releases May - September
*[[A 2022 Fall HFE| A Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)

==2021==
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow Spring Disturbance Flow]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)
*Andrew Schultz becomes GCMRC Chief

==2020==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)
*COVID moves all meetings for the year to remote
*Ed Keable becomes superintendent of Grand Canyon National Park

==2019==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://www.usbr.gov/uc/progact/amp/amwg/2019-08-21-amwg-meeting/20190821-GlenCanyonDamAdaptiveManagementProgramGuidance-508-UCRO.pdf DOI Guidance from Dr. Tim Petty]
*Lee Traynham becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2018==
*[[The 2018 Fall HFE| Fall HFE]]: 38,100 cfs for 60h
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2017==
*[https://gcdamp.com/index.php/2017_Knowledge_Assessment 2017 Knowledge Assessment]
*Ryan Zinke becomes Secretary of the Interior

==2016==
*Publication of the [https://gcdamp.com/index.php/Long-term_Experimental_and_Management_Plan_(LTEMP) LTEMP EIS]
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2015==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] and [https://gcdamp.com/index.php/Green_Sunfish_Page green sunfish] start reproducing in Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of Triennial Budget and Workplans
*Scott VanderKooi becomes GCMRC Chief

==2014==
*Rainbow trout fishery collapses at Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 Fall HFE]: 37,500 cfs for 96h
*Galahad Point fire and flood eliminates the humpback chub translocation in Shinumo Creek

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 Fall HFE]: 34,100 cfs for 96h
*Sally Jewell becomes Secretary of the Interior

==2012==
*[https://gcdamp.com/index.php/Portal:Desired_Future_Conditions_-DFCs Development of the Desired Future Conditions (DFCs)]
*Publication of the [https://gcdamp.com/index.php/The_HFE_Page High Flow Experiment Protocol]
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*The 2011 Equalization releases from March - December
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]
*Start of Biennial Budget and Workplans
*Jack Schmidt becomes GCMRC Chief
*Dave Uberuaga becomes Superintendent of GCNP

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Glen Knowles becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Ken Salazar becomes Secretary of the Interior
*Anne Castle becomes Assistant Secretary for Water and Science

==2008==
*USFWS Biological Opinion identifies concerns with constructing a [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)] that can only release warm water
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs Spring HFE], 41,500 cfs for 60 hours
*Grand Canyon Trust files suit against USBR, USFWS, and others contending operations at Glen Canyon Dam ran counter to their obligations to comply with the ESA, NEPA, and Administrative Policy Act
*GCDAMP budget was capped

==2007==
*[http://www.riversimulator.org/Resources/USBR/LTEP/Randle2007.pdf Appraisal study on sediment augmentation]
*Pearce Ferry Rapid forms creating a non-navigable barrier for downstream rafting and barrier for upstream fish movement from Lake Mead
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]
*Steve Martin becomes superintendent of GCNP

==2006==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Draft Long-Term Experimental Plan Environmental Plan (LTEP)
*Dirk Kempthorne becomes Secretary of the Interior

==2005==
*[https://pubs.usgs.gov/circ/1282/c1282.pdf SCORE Report: The State of the Colorado River Ecosystem in Grand Canyon]
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Fluctuating trout suppression flows from January through March (2003-2005)

==2004==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*[https://pubs.usgs.gov/fs/2011/3012/ 2004 Fall HFE], 41,000 cfs for 60 hours
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]
*Fluctuating trout suppression flows from January through March (2003-2005)

==2003==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Fluctuating trout suppression flows from January through March (2003-2005)

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 years of an experimental design proposed by the GCMRC.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish
*Draft GCDAMP Strategic Plan for the developed by program managers.
*Gale Norton becomes Secretary of the Interior
*GCMRC moves from the office of the Assistant Secretary of the Interior to the US Geological Survey

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP
*[https://gcdamp.com/images_gcdamp_com/6/62/Appendix_B_%28Guidance_Document%29_Loveless.doc Glen Canyon Dam Adaptive Management Program AMWG FACA Committee Guidance (The 1999 Loveless Document)]
*Dennis Kubly becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1998==
*GCMRC is moved from USBR to the office of the Assistant Secretary of the Department of the Interior
*Barry Gold becomes acting GCRMC Chief

==1997==
*AMWG and TWG fully established
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*Formation of a GCDAMP Strategic Planning Subcommittee (1997-2000)
*Reclamation begins a Value Planning Study for a warm-water [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)]
*[[The 1997 Habitat Maintenance Flow (HMF)|1997 Habitat Maintenance Flow (HMF)]]
*Mary Orton joins AMWG as mediator
*Bruce Moore becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1996==
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement selects Modified Low Fluctuating Flows (MLFF) as the preferred alternative.
*[[The 1996 Spring HFE| 1996 Beach/Habitat-Building Flow (BHBF)]], 45,000 cfs for 168 hours
*Dave Garrett becomes first GCMRC Chief

==1995==
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)
*Establishment of the Grand Canyon Monitoring and Research Center (GCMRC)
*The Glen Canyon Dam Environmental Impact Statement as required by the Grand Canyon Protection Act is completed.
*The Grand Canyon National Park General Management Plan

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]

==1993==
*Bruce Babbitt becomes Secretary of the Interior
*Dan Beard becomes USBR Commissioner

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act ]

==1991==
*Interim operating criteria for Glen Canyon Dam implemented
*The 1990-91 Experimental Flows
*Razorback Sucker and Kanab Ambersnail federally listed as endangered

==1990==
*Beginning of Interim Operating Criteria
*The 1990-91 Experimental Flows
*Formulative discussions on the concept of HFEs begin lead by Duncan Patton

==1989==
*Manuel Lujan becomes Secretary of the Interior and orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem

==1988==
*Salt Lake City Area Integrated Projects(CRSP) passed after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1986==

==1985==

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1984 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1975==
*Grand Canyon National Park Enlargement Act passed

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1972==
*Last verified record of [https://gcdamp.com/index.php/Colorado_Pikeminnow Colorado Pikeminnow] caught in Grand Canyon at Havasu Creek

==1971==

==1970==
*[https://www.usbr.gov/lc/region/pao/pdfiles/opcriter.pdf Long-range Operating Criteria (LROC)] developed for Glen Canyon Dam operations

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1968==
*Colorado River Basin Project Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1966==
*National Historic Preservation Act passed
*Crystal rapid forms after a large flash flood from Crystal Creek

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1963==
*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Court held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1935 ==
*Hoover Dam completed

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” ]

== 1919 ==
*Grand Canyon National Park created

== 1916 ==
*National Park Service Organic Act passed

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1869 ==
*Major John Wesley Powell leads first recorded expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

==*11,000 BP==
*Paleo-Indian peoples occupy Grand Canyon region

GCDAMP History Time-Line -Years

2026-09-29T17:59:00Z

Cellsworth:

__NOTOC__
==2027==
*LTEMP 10-Year Review

==2026==
*Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]
*Bright Angel creek floods from monsoon rains on the Dragon-Bravo fire scar

==2025==
*Razorback suckers stocked into the Little Colorado River (2023-2025)
*The [https://gcdamp.com/index.php/The_-12_Mile_Slough -12 Mile Slough] gets renovated
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass
*Dragon-Bravo fire burns on the North Rim

==2024==
*Razorback suckers stocked into the Little Colorado River (2023-2025)
*[https://gcdamp.com/index.php/Humpback_Chub_Page Humpback chub] population in Grand Canyon grows to 70,000 adults (40,000–200,000; 95% credible interval)
*The LTEMP EIS is modified to allow for releases to control smallmouth bass and to modify the sediment accounting windows for HFEs
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2023==
*Razorback suckers stocked into the Little Colorado River (2023-2025)
*[[The 2023 Spring HFE| Spring HFE: 39,500 cfs for 72h]]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)
*Bill Stewart becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2022==
*Release temperatures at Glen Canyon Dam reach 20.5C with low reservoir elevations
*Balancing releases May - September
*[[A 2022 Fall HFE| A Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)

==2021==
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow Spring Disturbance Flow]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)
*Andrew Schultz becomes GCMRC Chief

==2020==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry (2020-2023)
*COVID moves all meetings for the year to remote
*Ed Keable becomes superintendent of Grand Canyon National Park

==2019==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://www.usbr.gov/uc/progact/amp/amwg/2019-08-21-amwg-meeting/20190821-GlenCanyonDamAdaptiveManagementProgramGuidance-508-UCRO.pdf DOI Guidance from Dr. Tim Petty]
*Lee Traynham becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2018==
*[[The 2018 Fall HFE| Fall HFE]]: 38,100 cfs for 60h
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2017==
*[https://gcdamp.com/index.php/2017_Knowledge_Assessment 2017 Knowledge Assessment]
*Ryan Zinke becomes Secretary of the Interior

==2016==
*Publication of the [https://gcdamp.com/index.php/Long-term_Experimental_and_Management_Plan_(LTEMP) LTEMP EIS]
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2015==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] and [https://gcdamp.com/index.php/Green_Sunfish_Page green sunfish] start reproducing in Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of Triennial Budget and Workplans
*Scott VanderKooi becomes GCMRC Chief

==2014==
*Rainbow trout fishery collapses at Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 Fall HFE]: 37,500 cfs for 96h
*Galahad Point fire and flood eliminates the humpback chub translocation in Shinumo Creek

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 Fall HFE]: 34,100 cfs for 96h
*Sally Jewell becomes Secretary of the Interior

==2012==
*[https://gcdamp.com/index.php/Portal:Desired_Future_Conditions_-DFCs Development of the Desired Future Conditions (DFCs)]
*Publication of the [https://gcdamp.com/index.php/The_HFE_Page High Flow Experiment Protocol]
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*The 2011 Equalization releases from March - December
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]
*Start of Biennial Budget and Workplans
*Jack Schmidt becomes GCMRC Chief
*Dave Uberuaga becomes Superintendent of GCNP

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Glen Knowles becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Ken Salazar becomes Secretary of the Interior
*Anne Castle becomes Assistant Secretary for Water and Science

==2008==
*USFWS Biological Opinion identifies concerns with constructing a [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)] that can only release warm water
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs Spring HFE]
*Grand Canyon Trust files suit against USBR, USFWS, and others contending operations at Glen Canyon Dam ran counter to their obligations to comply with the ESA, NEPA, and Administrative Policy Act
*GCDAMP budget was capped

==2007==
*[http://www.riversimulator.org/Resources/USBR/LTEP/Randle2007.pdf Appraisal study on sediment augmentation]
*Pearce Ferry Rapid forms creating a non-navigable barrier for downstream rafting and barrier for upstream fish movement from Lake Mead
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]
*Steve Martin becomes superintendent of GCNP

==2006==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Draft Long-Term Experimental Plan Environmental Plan (LTEP)
*Dirk Kempthorne becomes Secretary of the Interior

==2005==
*[https://pubs.usgs.gov/circ/1282/c1282.pdf SCORE Report: The State of the Colorado River Ecosystem in Grand Canyon]
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Fluctuating trout suppression flows from January through March (2003-2005)

==2004==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*[https://pubs.usgs.gov/fs/2011/3012/ 2004 Fall HFE]
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]
*Fluctuating trout suppression flows from January through March (2003-2005)

==2003==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Fluctuating trout suppression flows from January through March (2003-2005)

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 years of an experimental design proposed by the GCMRC.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish
*Draft GCDAMP Strategic Plan for the developed by program managers.
*Gale Norton becomes Secretary of the Interior
*GCMRC moves from the office of the Assistant Secretary of the Interior to the US Geological Survey

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP
*[https://gcdamp.com/images_gcdamp_com/6/62/Appendix_B_%28Guidance_Document%29_Loveless.doc Glen Canyon Dam Adaptive Management Program AMWG FACA Committee Guidance (The 1999 Loveless Document)]
*Dennis Kubly becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1998==
*GCMRC is moved from USBR to the office of the Assistant Secretary of the Department of the Interior
*Barry Gold becomes acting GCRMC Chief

==1997==
*AMWG and TWG fully established
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*Formation of a GCDAMP Strategic Planning Subcommittee (1997-2000)
*Reclamation begins a Value Planning Study for a warm-water [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)]
*[[The 1997 Habitat Maintenance Flow (HMF)|1997 Habitat Maintenance Flow (HMF)]]
*Mary Orton joins AMWG as mediator
*Bruce Moore becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1996==
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement selects Modified Low Fluctuating Flows (MLFF) as the preferred alternative.
*[[The 1996 Spring HFE| 1996 Beach/Habitat-Building Flow (BHBF)]]
*Dave Garrett becomes first GCMRC Chief

==1995==
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)
*Establishment of the Grand Canyon Monitoring and Research Center (GCMRC)
*The Glen Canyon Dam Environmental Impact Statement as required by the Grand Canyon Protection Act is completed.
*The Grand Canyon National Park General Management Plan

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]

==1993==
*Bruce Babbitt becomes Secretary of the Interior
*Dan Beard becomes USBR Commissioner

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act ]

==1991==
*Interim operating criteria for Glen Canyon Dam implemented
*The 1990-91 Experimental Flows
*Razorback Sucker and Kanab Ambersnail federally listed as endangered

==1990==
*Beginning of Interim Operating Criteria
*The 1990-91 Experimental Flows
*Formulative discussions on the concept of HFEs begin lead by Duncan Patton

==1989==
*Manuel Lujan becomes Secretary of the Interior and orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem

==1988==
*Salt Lake City Area Integrated Projects(CRSP) passed after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1986==

==1985==

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1984 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1975==
*Grand Canyon National Park Enlargement Act passed

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1972==
*Last verified record of [https://gcdamp.com/index.php/Colorado_Pikeminnow Colorado Pikeminnow] caught in Grand Canyon at Havasu Creek

==1971==

==1970==
*[https://www.usbr.gov/lc/region/pao/pdfiles/opcriter.pdf Long-range Operating Criteria (LROC)] developed for Glen Canyon Dam operations

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1968==
*Colorado River Basin Project Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1966==
*National Historic Preservation Act passed
*Crystal rapid forms after a large flash flood from Crystal Creek

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1963==
*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Court held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1935 ==
*Hoover Dam completed

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” ]

== 1919 ==
*Grand Canyon National Park created

== 1916 ==
*National Park Service Organic Act passed

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1869 ==
*Major John Wesley Powell leads first recorded expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

==*11,000 BP==
*Paleo-Indian peoples occupy Grand Canyon region

GCDAMP History Time-Line -Years

2026-09-29T17:38:17Z

Cellsworth:

__NOTOC__
==2027==
*LTEMP 10-Year Review

==2026==
*Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]
*Bright Angel creek floods from monsoon rains on the Dragon-Bravo fire scar

==2025==
*The [https://gcdamp.com/index.php/The_-12_Mile_Slough -12 Mile Slough] gets renovated
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass
*Dragon-Bravo fire burns on the North Rim

==2024==
*[https://gcdamp.com/index.php/Humpback_Chub_Page Humpback chub] population in Grand Canyon grows to 70,000 adults (40,000–200,000; 95% credible interval)
*The LTEMP EIS is modified to allow for releases to control smallmouth bass and to modify the sediment accounting windows for HFEs
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2023==
*[[The 2023 Spring HFE| Spring HFE: 39,500 cfs for 72h]]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*Bill Stewart becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2022==
*Release temperatures at Glen Canyon Dam reach 20.5C with low reservoir elevations
*Balancing releases May - September
*[[A 2022 Fall HFE| A Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry

==2021==
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow Spring Disturbance Flow]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*Andrew Schultz becomes GCMRC Chief

==2020==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*COVID moves all meetings for the year to remote
*Ed Keable becomes superintendent of Grand Canyon National Park

==2019==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://www.usbr.gov/uc/progact/amp/amwg/2019-08-21-amwg-meeting/20190821-GlenCanyonDamAdaptiveManagementProgramGuidance-508-UCRO.pdf DOI Guidance from Dr. Tim Petty]
*Lee Traynham becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2018==
*[[The 2018 Fall HFE| Fall HFE]]: 38,100 cfs for 60h
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2017==
*[https://gcdamp.com/index.php/2017_Knowledge_Assessment 2017 Knowledge Assessment]
*Ryan Zinke becomes Secretary of the Interior

==2016==
*Publication of the [https://gcdamp.com/index.php/Long-term_Experimental_and_Management_Plan_(LTEMP) LTEMP EIS]
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2015==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] and [https://gcdamp.com/index.php/Green_Sunfish_Page green sunfish] start reproducing in Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of Triennial Budget and Workplans
*Scott VanderKooi becomes GCMRC Chief

==2014==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 Fall HFE]: 37,500 cfs for 96h
*Galahad Point fire and flood eliminates the humpback chub translocation in Shinumo Creek

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 Fall HFE]: 34,100 cfs for 96h
*Sally Jewell becomes Secretary of the Interior

==2012==
*[https://gcdamp.com/index.php/Portal:Desired_Future_Conditions_-DFCs Development of the Desired Future Conditions (DFCs)]
*Publication of the [https://gcdamp.com/index.php/The_HFE_Page High Flow Experiment Protocol]
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*The 2011 Equalization releases March - December
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]
*Start of Biennial Budget and Workplans
*Jack Schmidt becomes GCMRC Chief
*Dave Uberuaga becomes Superintendent of GCNP

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Glen Knowles becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Ken Salazar becomes Secretary of the Interior
*Anne Castle becomes Assistant Secretary for Water and Science

==2008==
*USFWS Biological Opinion identifies concerns with constructing a [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)] that can only release warm water
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs Spring HFE]
*Grand Canyon Trust files suit against USBR, USFWS, and others contending operations at Glen Canyon Dam rand counter to their obligations to comply with the ESA, NEPA, and Administrative Policy Act
*GCDAMP budget was capped

==2007==
*[http://www.riversimulator.org/Resources/USBR/LTEP/Randle2007.pdf Appraisal study on sediment augmentation]
*Pearce Ferry Rapid forms creating a non-navigable barrier for downstream rafting and barrier for upstream fish movement from Lake Mead
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]
*Steve Martin becomes superintendent of GCNP

==2006==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Draft Long-Term Experimental Plan Environmental Plan (LTEP)
*Dirk Kempthorne becomes Secretary of the Interior

==2005==
*[https://pubs.usgs.gov/circ/1282/c1282.pdf SCORE Report: The State of the Colorado River Ecosystem in Grand Canyon]
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)

==2004==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*[https://pubs.usgs.gov/fs/2011/3012/ 2004 Fall HFE]
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]

==2003==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Fluctuating trout suppression flows from January through March implemented and continued through 2005.

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 years of an experimental design proposed by the GCMRC.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish
*Draft GCDAMP Strategic Plan for the developed by program managers.
*Gale Norton becomes Secretary of the Interior
*GCMRC moves from the office of the Assistant Secretary of the Interior to the US Geological Survey

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP
*[https://gcdamp.com/images_gcdamp_com/6/62/Appendix_B_%28Guidance_Document%29_Loveless.doc Glen Canyon Dam Adaptive Management Program AMWG FACA Committee Guidance (The 1999 Loveless Document)]
*Dennis Kubly becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1998==
*GCMRC is moved from USBR to the office of the Assistant Secretary of the Department of the Interior
*Barry Gold becomes acting GCRMC Chief

==1997==
*AMWG and TWG fully established
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*Formation of a GCDAMP Strategic Planning Subcommittee (1997-2000)
*Reclamation begins a Value Planning Study for a warm-water [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)]
*[[The 1997 Habitat Maintenance Flow (HMF)|1997 Habitat Maintenance Flow (HMF)]]
*Mary Orton joins AMWG as mediator
*Bruce Moore becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1996==
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement selects Modified Low Fluctuating Flows (MLFF) as the preferred alternative.
*[[The 1996 Spring HFE| 1996 Beach/Habitat-Building Flow (BHBF)]]
*Dave Garrett becomes first GCMRC Chief

==1995==
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)
*Establishment of the Grand Canyon Monitoring and Research Center (GCMRC)
*The Glen Canyon Dam Environmental Impact Statement as required by the Grand Canyon Protection Act is completed.
*The Grand Canyon National Park General Management Plan

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]

==1993==
*Bruce Babbitt becomes Secretary of the Interior
*Dan Beard becomes USBR Commissioner

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act ]

==1991==
*Interim operating criteria for Glen Canyon Dam implemented
*The 1990-91 Experimental Flows
*Razorback Sucker and Kanab Ambersnail federally listed as endangered

==1990==
*Beginning of Interim Operating Criteria
*The 1990-91 Experimental Flows
*Formulative discussions on the concept of HFEs begin lead by Duncan Patton

==1989==
*Manuel Lujan becomes Secretary of the Interior and orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem

==1988==
*Salt Lake City Area Integrated Projects(CRSP) passed after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1986==

==1985==

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1984 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1975==
*Grand Canyon National Park Enlargement Act passed

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1972==
*Last verified record of [https://gcdamp.com/index.php/Colorado_Pikeminnow Colorado Pikeminnow] caught in Grand Canyon at Havasu Creek

==1971==

==1970==
*[https://www.usbr.gov/lc/region/pao/pdfiles/opcriter.pdf Long-range Operating Criteria (LROC)] developed for Glen Canyon Dam operations

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1968==
*Colorado River Basin Project Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1966==
*National Historic Preservation Act passed
*Crystal rapid forms after a large flash flood from Crystal Creek

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1963==
*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Court held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1935 ==
*Hoover Dam completed

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” ]

== 1919 ==
*Grand Canyon National Park created

== 1916 ==
*National Park Service Organic Act passed

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1869 ==
*Major John Wesley Powell leads first recorded expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

==*11,000 BP==
*Paleo-Indian peoples occupy Grand Canyon region

GCDAMP History Time-Line -Years

2026-09-29T17:33:31Z

Cellsworth:

__NOTOC__
==2027==
*LTEMP 10-Year Review

==2026==
*Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]
*Bright Angel creek floods from monsoon rains on the Dragon-Bravo fire scar

==2025==
*The [https://gcdamp.com/index.php/The_-12_Mile_Slough -12 Mile Slough] gets renovated
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass
*Dragon-Bravo fire burns on the North Rim

==2024==
*[https://gcdamp.com/index.php/Humpback_Chub_Page Humpback chub] population in Grand Canyon grows to 70,000 adults (40,000–200,000; 95% credible interval)
*The LTEMP EIS is modified to allow for releases to control smallmouth bass and to modify the sediment accounting windows for HFEs
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2023==
*[[The 2023 Spring HFE| Spring HFE: 39,500 cfs for 72h]]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*Bill Stewart becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2022==
*Release temperatures at Glen Canyon Dam reach 20.5C with low reservoir elevations
*Balancing releases May - September
*[[A 2022 Fall HFE| A Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry

==2021==
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow Spring Disturbance Flow]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*Andrew Schultz becomes GCMRC Chief

==2020==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*COVID moves all meetings for the year to remote
*Ed Keable becomes superintendent of Grand Canyon National Park

==2019==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://www.usbr.gov/uc/progact/amp/amwg/2019-08-21-amwg-meeting/20190821-GlenCanyonDamAdaptiveManagementProgramGuidance-508-UCRO.pdf DOI Guidance from Dr. Tim Petty]
*Lee Traynham becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2018==
*[[The 2018 Fall HFE| Fall HFE]]: 38,100 cfs for 60h
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2017==
*[https://gcdamp.com/index.php/2017_Knowledge_Assessment 2017 Knowledge Assessment]
*Ryan Zinke becomes Secretary of the Interior

==2016==
*Publication of the [https://gcdamp.com/index.php/Long-term_Experimental_and_Management_Plan_(LTEMP) LTEMP EIS]
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2015==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] and [https://gcdamp.com/index.php/Green_Sunfish_Page green sunfish] start reproducing in Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of Triennial Budget and Workplans
*Scott VanderKooi becomes GCMRC Chief

==2014==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 Fall HFE]: 37,500 cfs for 96h
*Galahad Point fire and flood eliminates the humpback chub translocation in Shinumo Creek

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 Fall HFE]: 34,100 cfs for 96h
*Sally Jewell becomes Secretary of the Interior

==2012==
*[https://gcdamp.com/index.php/Portal:Desired_Future_Conditions_-DFCs Development of the Desired Future Conditions (DFCs)]
*Publication of the [https://gcdamp.com/index.php/The_HFE_Page High Flow Experiment Protocol]
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*The 2011 Equalization releases March - December
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]
*Start of Biennial Budget and Workplans
*Jack Schmidt becomes GCMRC Chief
*Dave Uberuaga becomes Superintendent of GCNP

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Glen Knowles becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Ken Salazar becomes Secretary of the Interior
*Anne Castle becomes Assistant Secretary for Water and Science

==2008==
*USFWS Biological Opinion identifies concerns with constructing a [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)] that can only release warm water
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs Spring HFE]
*Grand Canyon Trust files suit against USBR, USFWS, and others contending operations at Glen Canyon Dam rand counter to their obligations to comply with the ESA, NEPA, and Administrative Policy Act
*GCDAMP budget was capped

==2007==
*Pearce Ferry Rapid forms creating a non-navigable barrier for downstream rafting and barrier for upstream fish movement from Lake Mead
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]
*Steve Martin becomes superintendent of GCNP

==2006==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Draft Long-Term Experimental Plan Environmental Plan (LTEP)
*Dirk Kempthorne becomes Secretary of the Interior

==2005==
*[https://pubs.usgs.gov/circ/1282/c1282.pdf SCORE Report: The State of the Colorado River Ecosystem in Grand Canyon]
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)

==2004==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*[https://pubs.usgs.gov/fs/2011/3012/ 2004 Fall HFE]
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]

==2003==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Fluctuating trout suppression flows from January through March implemented and continued through 2005.

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 years of an experimental design proposed by the GCMRC.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish
*Draft GCDAMP Strategic Plan for the developed by program managers.
*Gale Norton becomes Secretary of the Interior
*GCMRC moves from the office of the Assistant Secretary of the Interior to the US Geological Survey

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP
*[https://gcdamp.com/images_gcdamp_com/6/62/Appendix_B_%28Guidance_Document%29_Loveless.doc Glen Canyon Dam Adaptive Management Program AMWG FACA Committee Guidance (The 1999 Loveless Document)]
*Dennis Kubly becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1998==
*GCMRC is moved from USBR to the office of the Assistant Secretary of the Department of the Interior
*Barry Gold becomes acting GCRMC Chief

==1997==
*AMWG and TWG fully established
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*Formation of a GCDAMP Strategic Planning Subcommittee (1997-2000)
*Reclamation begins a Value Planning Study for a warm-water [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)]
*[[The 1997 Habitat Maintenance Flow (HMF)|1997 Habitat Maintenance Flow (HMF)]]
*Mary Orton joins AMWG as mediator
*Bruce Moore becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1996==
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement selects Modified Low Fluctuating Flows (MLFF) as the preferred alternative.
*[[The 1996 Spring HFE| 1996 Beach/Habitat-Building Flow (BHBF)]]
*Dave Garrett becomes first GCMRC Chief

==1995==
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)
*Establishment of the Grand Canyon Monitoring and Research Center (GCMRC)
*The Glen Canyon Dam Environmental Impact Statement as required by the Grand Canyon Protection Act is completed.
*The Grand Canyon National Park General Management Plan

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]

==1993==
*Bruce Babbitt becomes Secretary of the Interior
*Dan Beard becomes USBR Commissioner

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act ]

==1991==
*Interim operating criteria for Glen Canyon Dam implemented
*The 1990-91 Experimental Flows
*Razorback Sucker and Kanab Ambersnail federally listed as endangered

==1990==
*Beginning of Interim Operating Criteria
*The 1990-91 Experimental Flows
*Formulative discussions on the concept of HFEs begin lead by Duncan Patton

==1989==
*Manuel Lujan becomes Secretary of the Interior and orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem

==1988==
*Salt Lake City Area Integrated Projects(CRSP) passed after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1986==

==1985==

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1984 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1975==
*Grand Canyon National Park Enlargement Act passed

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1972==
*Last verified record of [https://gcdamp.com/index.php/Colorado_Pikeminnow Colorado Pikeminnow] caught in Grand Canyon at Havasu Creek

==1971==

==1970==
*[https://www.usbr.gov/lc/region/pao/pdfiles/opcriter.pdf Long-range Operating Criteria (LROC)] developed for Glen Canyon Dam operations

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1968==
*Colorado River Basin Project Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1966==
*National Historic Preservation Act passed
*Crystal rapid forms after a large flash flood from Crystal Creek

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1963==
*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Court held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1935 ==
*Hoover Dam completed

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” ]

== 1919 ==
*Grand Canyon National Park created

== 1916 ==
*National Park Service Organic Act passed

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1869 ==
*Major John Wesley Powell leads first recorded expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

==*11,000 BP==
*Paleo-Indian peoples occupy Grand Canyon region

Glen Canyon Dam Adaptive Management ADMINISTRATIVE HISTORY

2026-09-29T16:31:25Z

Cellsworth:

GCDAMP History Time-Line -Years

2026-09-29T16:25:11Z

Cellsworth:

__NOTOC__
==2027==
*LTEMP 10-Year Review

==2026==
*Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]
*Bright Angel creek floods from monsoon rains on the Dragon-Bravo fire scar

==2025==
*The [https://gcdamp.com/index.php/The_-12_Mile_Slough -12 Mile Slough] gets renovated
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass
*Dragon-Bravo fire burns on the North Rim

==2024==
*[https://gcdamp.com/index.php/Humpback_Chub_Page Humpback chub] population in Grand Canyon grows to 70,000 adults (40,000–200,000; 95% credible interval)
*The LTEMP EIS is modified to allow for releases to control smallmouth bass and to modify the sediment accounting windows for HFEs
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2023==
*[[The 2023 Spring HFE| Spring HFE: 39,500 cfs for 72h]]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*Bill Stewart becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2022==
*Release temperatures at Glen Canyon Dam reach 20.5C with low reservoir elevations
*[[A 2022 Fall HFE| A Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry

==2021==
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow Spring Disturbance Flow]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*Andrew Schultz becomes GCMRC Chief

==2020==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*COVID moves all meetings for the year to remote
*Ed Keable becomes superintendent of Grand Canyon National Park

==2019==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://www.usbr.gov/uc/progact/amp/amwg/2019-08-21-amwg-meeting/20190821-GlenCanyonDamAdaptiveManagementProgramGuidance-508-UCRO.pdf DOI Guidance from Dr. Tim Petty]
*Lee Traynham becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2018==
*[[The 2018 Fall HFE| Fall HFE]]: 38,100 cfs for 60h
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2017==
*[https://gcdamp.com/index.php/2017_Knowledge_Assessment 2017 Knowledge Assessment]
*Ryan Zinke becomes Secretary of the Interior

==2016==
*Publication of the [https://gcdamp.com/index.php/Long-term_Experimental_and_Management_Plan_(LTEMP) LTEMP EIS]
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2015==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] and [https://gcdamp.com/index.php/Green_Sunfish_Page green sunfish] start reproducing in Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of Triennial Budget and Workplans
*Scott VanderKooi becomes GCMRC Chief

==2014==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 Fall HFE]: 37,500 cfs for 96h
*Galahad Point fire and flood eliminates the humpback chub translocation in Shinumo Creek

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 Fall HFE]: 34,100 cfs for 96h
*Sally Jewell becomes Secretary of the Interior

==2012==
*[https://gcdamp.com/index.php/Portal:Desired_Future_Conditions_-DFCs Development of the Desired Future Conditions (DFCs)]
*Publication of the [https://gcdamp.com/index.php/The_HFE_Page High Flow Experiment Protocol]
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*The 2011 Equalization flows
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]
*Start of Biennial Budget and Workplans
*Jack Schmidt becomes GCMRC Chief
*Dave Uberuaga becomes Superintendent of GCNP

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Glen Knowles becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Ken Salazar becomes Secretary of the Interior
*Anne Castle becomes Assistant Secretary for Water and Science

==2008==
*USFWS Biological Opinion identifies concerns with constructing a [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)] that can only release warm water
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs Spring HFE]
*Grand Canyon Trust files suit against USBR, USFWS, and others contending operations at Glen Canyon Dam rand counter to their obligations to comply with the ESA, NEPA, and Administrative Policy Act
*GCDAMP budget was capped

==2007==
*Pearce Ferry Rapid forms creating a non-navigable barrier for downstream rafting and barrier for upstream fish movement from Lake Mead
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]
*Steve Martin becomes superintendent of GCNP

==2006==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Draft Long-Term Experimental Plan Environmental Plan (LTEP)
*Dirk Kempthorne becomes Secretary of the Interior

==2005==
*[https://pubs.usgs.gov/circ/1282/c1282.pdf SCORE Report: The State of the Colorado River Ecosystem in Grand Canyon]
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)

==2004==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*[https://pubs.usgs.gov/fs/2011/3012/ 2004 Fall HFE]
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]

==2003==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Fluctuating trout suppression flows from January through March implemented and continued through 2005.

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 years of an experimental design proposed by the GCMRC.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish
*Draft GCDAMP Strategic Plan for the developed by program managers.
*Gale Norton becomes Secretary of the Interior
*GCMRC moves from the office of the Assistant Secretary of the Interior to the US Geological Survey

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP
*[https://gcdamp.com/images_gcdamp_com/6/62/Appendix_B_%28Guidance_Document%29_Loveless.doc Glen Canyon Dam Adaptive Management Program AMWG FACA Committee Guidance (The 1999 Loveless Document)]
*Dennis Kubly becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1998==
*GCMRC is moved from USBR to the office of the Assistant Secretary of the Department of the Interior
*Barry Gold becomes acting GCRMC Chief

==1997==
*AMWG and TWG fully established
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*Formation of a GCDAMP Strategic Planning Subcommittee (1997-2000)
*Reclamation begins a Value Planning Study for a warm-water [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)]
*[[The 1997 Habitat Maintenance Flow (HMF)|1997 Habitat Maintenance Flow (HMF)]]
*Mary Orton joins AMWG as mediator
*Bruce Moore becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1996==
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement selects Modified Low Fluctuating Flows (MLFF) as the preferred alternative.
*[[The 1996 Spring HFE| 1996 Beach/Habitat-Building Flow (BHBF)]]
*Dave Garrett becomes first GCMRC Chief

==1995==
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)
*Establishment of the Grand Canyon Monitoring and Research Center (GCMRC)
*The Glen Canyon Dam Environmental Impact Statement as required by the Grand Canyon Protection Act is completed.
*The Grand Canyon National Park General Management Plan

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]

==1993==
*Bruce Babbitt becomes Secretary of the Interior
*Dan Beard becomes USBR Commissioner

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act ]

==1991==
*Interim operating criteria for Glen Canyon Dam implemented
*The 1990-91 Experimental Flows
*Razorback Sucker and Kanab Ambersnail federally listed as endangered

==1990==
*Beginning of Interim Operating Criteria
*The 1990-91 Experimental Flows
*Formulative discussions on the concept of HFEs begin lead by Duncan Patton

==1989==
*Manuel Lujan becomes Secretary of the Interior and orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem

==1988==
*Salt Lake City Area Integrated Projects(CRSP) passed after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1986==

==1985==

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1984 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1975==
*Grand Canyon National Park Enlargement Act passed

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1972==
*Last verified record of [https://gcdamp.com/index.php/Colorado_Pikeminnow Colorado Pikeminnow] caught in Grand Canyon at Havasu Creek

==1971==

==1970==
*[https://www.usbr.gov/lc/region/pao/pdfiles/opcriter.pdf Long-range Operating Criteria (LROC)] developed for Glen Canyon Dam operations

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1968==
*Colorado River Basin Project Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1966==
*National Historic Preservation Act passed
*Crystal rapid forms after a large flash flood from Crystal Creek

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1963==
*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Court held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1935 ==
*Hoover Dam completed

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” ]

== 1919 ==
*Grand Canyon National Park created

== 1916 ==
*National Park Service Organic Act passed

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1869 ==
*Major John Wesley Powell leads first recorded expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

==*11,000 BP==
*Paleo-Indian peoples occupy Grand Canyon region

GCDAMP History Time-Line -Years

2026-09-29T16:19:36Z

Cellsworth:

__NOTOC__
==2027==
*LTEMP 10-Year Review

==2026==
*Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]
*Bright Angel creek floods from monsoon rains on the Dragon-Bravo fire scar

==2025==
*The [https://gcdamp.com/index.php/The_-12_Mile_Slough -12 Mile Slough] gets renovated
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass
*Dragon-Bravo fire burns on the North Rim

==2024==
*[https://gcdamp.com/index.php/Humpback_Chub_Page Humpback chub] population in Grand Canyon grows to 70,000 adults (40,000–200,000; 95% credible interval)
*The LTEMP EIS is modified to allow for releases to control smallmouth bass and to modify the sediment accounting windows for HFEs
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2023==
*[[The 2023 Spring HFE| Spring HFE: 39,500 cfs for 72h]]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*Bill Stewart becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2022==
*Release temperatures at Glen Canyon Dam reach 20.5C with low reservoir elevations
*[[A 2022 Fall HFE| A Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry

==2021==
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow Spring Disturbance Flow]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*Andrew Schultz becomes GCMRC Chief

==2020==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*COVID moves all meetings for the year to remote
*Ed Keable becomes superintendent of Grand Canyon National Park

==2019==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://www.usbr.gov/uc/progact/amp/amwg/2019-08-21-amwg-meeting/20190821-GlenCanyonDamAdaptiveManagementProgramGuidance-508-UCRO.pdf DOI Guidance from Dr. Tim Petty]
*Lee Traynham becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2018==
*[[The 2018 Fall HFE| Fall HFE]]: 38,100 cfs for 60h
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2017==
*[https://gcdamp.com/index.php/2017_Knowledge_Assessment 2017 Knowledge Assessment]
*Ryan Zinke becomes Secretary of the Interior

==2016==
*Publication of the [https://gcdamp.com/index.php/Long-term_Experimental_and_Management_Plan_(LTEMP) LTEMP EIS]
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2015==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] and [https://gcdamp.com/index.php/Green_Sunfish_Page green sunfish] start reproducing in Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of Triennial Budget and Workplans
*Scott VanderKooi becomes GCMRC Chief

==2014==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 Fall HFE]: 37,500 cfs for 96h
*Galahad Point fire and flood eliminates the humpback chub translocation in Shinumo Creek

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 Fall HFE]: 34,100 cfs for 96h
*Sally Jewell becomes Secretary of the Interior

==2012==
*[https://gcdamp.com/index.php/Portal:Desired_Future_Conditions_-DFCs Development of the Desired Future Conditions (DFCs)]
*Publication of the [https://gcdamp.com/index.php/The_HFE_Page High Flow Experiment Protocol]
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*The 2011 Equalization flows
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]
*Start of Biennial Budget and Workplans
*Jack Schmidt becomes GCMRC Chief
*Dave Uberuaga becomes Superintendent of GCNP

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Glen Knowles becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Ken Salazar becomes Secretary of the Interior
*Anne Castle becomes Assistant Secretary for Water and Science

==2008==
*USFWS Biological Opinion identifies concerns with constructing a [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)] that can only release warm water
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs Spring HFE]
*Grand Canyon Trust files suit against USBR, USFWS, and others contending operations at Glen Canyon Dam rand counter to their obligations to comply with the ESA, NEPA, and Administrative Policy Act
*GCDAMP budget was capped

==2007==
*Pearce Ferry Rapid forms
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]
*Steve Martin becomes superintendent of GCNP

==2006==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Draft Long-Term Experimental Plan Environmental Plan (LTEP)
*Dirk Kempthorne becomes Secretary of the Interior

==2005==
*[https://pubs.usgs.gov/circ/1282/c1282.pdf SCORE Report: The State of the Colorado River Ecosystem in Grand Canyon]
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)

==2004==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*[https://pubs.usgs.gov/fs/2011/3012/ 2004 Fall HFE]
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]

==2003==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Fluctuating trout suppression flows from January through March implemented and continued through 2005.

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 years of an experimental design proposed by the GCMRC.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish
*Draft GCDAMP Strategic Plan for the developed by program managers.
*Gale Norton becomes Secretary of the Interior
*GCMRC moves from the office of the Assistant Secretary of the Interior to the US Geological Survey

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP
*[https://gcdamp.com/images_gcdamp_com/6/62/Appendix_B_%28Guidance_Document%29_Loveless.doc Glen Canyon Dam Adaptive Management Program AMWG FACA Committee Guidance (The 1999 Loveless Document)]
*Dennis Kubly becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1998==
*GCMRC is moved from USBR to the office of the Assistant Secretary of the Department of the Interior
*Barry Gold becomes acting GCRMC Chief

==1997==
*AMWG and TWG fully established
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*Formation of a GCDAMP Strategic Planning Subcommittee (1997-2000)
*Reclamation begins a Value Planning Study for a warm-water [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)]
*[[The 1997 Habitat Maintenance Flow (HMF)|1997 Habitat Maintenance Flow (HMF)]]
*Mary Orton joins AMWG as mediator
*Bruce Moore becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1996==
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement selects Modified Low Fluctuating Flows (MLFF) as the preferred alternative.
*[[The 1996 Spring HFE| 1996 Beach/Habitat-Building Flow (BHBF)]]
*Dave Garrett becomes first GCMRC Chief

==1995==
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)
*Establishment of the Grand Canyon Monitoring and Research Center (GCMRC)
*The Glen Canyon Dam Environmental Impact Statement as required by the Grand Canyon Protection Act is completed.
*The Grand Canyon National Park General Management Plan

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]

==1993==
*Bruce Babbitt becomes Secretary of the Interior
*Dan Beard becomes USBR Commissioner

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act ]

==1991==
*Interim operating criteria for Glen Canyon Dam implemented
*The 1990-91 Experimental Flows
*Razorback Sucker and Kanab Ambersnail federally listed as endangered

==1990==
*Beginning of Interim Operating Criteria
*The 1990-91 Experimental Flows
*Formulative discussions on the concept of HFEs begin lead by Duncan Patton

==1989==
*Manuel Lujan becomes Secretary of the Interior and orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem

==1988==
*Salt Lake City Area Integrated Projects(CRSP) passed after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1986==

==1985==

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1984 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1975==
*Grand Canyon National Park Enlargement Act passed

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1972==
*Last verified record of [https://gcdamp.com/index.php/Colorado_Pikeminnow Colorado Pikeminnow] caught in Grand Canyon at Havasu Creek

==1971==

==1970==
*[https://www.usbr.gov/lc/region/pao/pdfiles/opcriter.pdf Long-range Operating Criteria (LROC)] developed for Glen Canyon Dam operations

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1968==
*Colorado River Basin Project Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1966==
*National Historic Preservation Act passed
*Crystal rapid forms after a large flash flood from Crystal Creek

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1963==
*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Court held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1935 ==
*Hoover Dam completed

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” ]

== 1919 ==
*Grand Canyon National Park created

== 1916 ==
*National Park Service Organic Act passed

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1869 ==
*Major John Wesley Powell leads first recorded expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

==*11,000 BP==
*Paleo-Indian peoples occupy Grand Canyon region

GCDAMP History Time-Line -Years

2026-09-29T16:05:05Z

Cellsworth:

__NOTOC__
==2027==

==2026==
*Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]
*Bright Angel creek floods

==2025==
*The [https://gcdamp.com/index.php/The_-12_Mile_Slough -12 Mile Slough] gets renovated
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass
*Dragon-Bravo fire

==2024==
*[https://gcdamp.com/index.php/Humpback_Chub_Page Humpback chub] population in Grand Canyon grows to 70,000 adults (40,000–200,000; 95% credible interval)
*The LTEMP EIS is modified to allow for releases to control smallmouth bass and to modify the sediment accounting windows for HFEs
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2023==
*[[The 2023 Spring HFE| Spring HFE: 39,500 cfs for 72h]]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*Bill Stewart becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2022==
*Release temperatures at Glen Canyon Dam reach 20.5C with low reservoir elevations
*[[A 2022 Fall HFE| A Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry

==2021==
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow Spring Disturbance Flow]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*Andrew Schultz becomes GCMRC Chief

==2020==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*COVID moves all meetings for the year to remote
*Ed Keable becomes superintendent of Grand Canyon National Park

==2019==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://www.usbr.gov/uc/progact/amp/amwg/2019-08-21-amwg-meeting/20190821-GlenCanyonDamAdaptiveManagementProgramGuidance-508-UCRO.pdf DOI Guidance from Dr. Tim Petty]
*Lee Traynham becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2018==
*[[The 2018 Fall HFE| Fall HFE]]: 38,100 cfs for 60h
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2017==
*Ryan Zinke becomes Secretary of the Interior

==2016==
*Publication of the [https://gcdamp.com/index.php/Long-term_Experimental_and_Management_Plan_(LTEMP) LTEMP EIS]
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2015==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] and [https://gcdamp.com/index.php/Green_Sunfish_Page green sunfish] start reproducing in Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of Triennial Budget and Workplans
*Scott VanderKooi becomes GCMRC Chief

==2014==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 Fall HFE]: 37,500 cfs for 96h
*Galahad Point fire and flood eliminates the humpback chub translocation in Shinumo Creek

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 Fall HFE]: 34,100 cfs for 96h
*Sally Jewell becomes Secretary of the Interior

==2012==
*[https://gcdamp.com/index.php/Portal:Desired_Future_Conditions_-DFCs Development of the Desired Future Conditions (DFCs)]
*Publication of the [https://gcdamp.com/index.php/The_HFE_Page High Flow Experiment Protocol]
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*The 2011 Equalization flows
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]
*Start of Biennial Budget and Workplans
*Jack Schmidt becomes GCMRC Chief
*Dave Uberuaga becomes Superintendent of GCNP

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Glen Knowles becomes program manager for the Glen Canyon Dam Adaptive Management Program

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment (2009-2011)]
*Ken Salazar becomes Secretary of the Interior
*Anne Castle becomes Assistant Secretary for Water and Science

==2008==
*USFWS Biological Opinion identifies concerns with constructing a [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)] that can only release warm water
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs Spring HFE]
*Grand Canyon Trust files suit against USBR, USFWS, and others contending operations at Glen Canyon Dam rand counter to their obligations to comply with the ESA, NEPA, and Administrative Policy Act
*GCDAMP budget was capped

==2007==
*Pearce Ferry Rapid forms
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]
*Steve Martin becomes superintendent of GCNP

==2006==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Draft Long-Term Experimental Plan Environmental Plan (LTEP)
*Dirk Kempthorne becomes Secretary of the Interior

==2005==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)

==2004==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*[https://pubs.usgs.gov/fs/2011/3012/ 2004 Fall HFE]
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]

==2003==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Fluctuating trout suppression flows from January through March implemented and continued through 2005.

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 years of an experimental design proposed by the GCMRC.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish
*Draft GCDAMP Strategic Plan for the developed by program managers.
*Gale Norton becomes Secretary of the Interior
*GCMRC moves from the office of the Assistant Secretary of the Interior to the US Geological Survey

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP
*[https://gcdamp.com/images_gcdamp_com/6/62/Appendix_B_%28Guidance_Document%29_Loveless.doc Glen Canyon Dam Adaptive Management Program AMWG FACA Committee Guidance (The 1999 Loveless Document)]
*Dennis Kubly becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1998==
*GCMRC is moved from USBR to the office of the Assistant Secretary of the Department of the Interior
*Barry Gold becomes acting GCRMC Chief

==1997==
*AMWG and TWG fully established
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*Formation of a GCDAMP Strategic Planning Subcommittee (1997-2000)
*Reclamation begins a Value Planning Study for a warm-water [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)]
*[[The 1997 Habitat Maintenance Flow (HMF)|1997 Habitat Maintenance Flow (HMF)]]
*Mary Orton joins AMWG as mediator
*Bruce Moore becomes program manager for the Glen Canyon Dam Adaptive Management Program

==1996==
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement selects Modified Low Fluctuating Flows (MLFF) as the preferred alternative.
*[[The 1996 Spring HFE| 1996 Beach/Habitat-Building Flow (BHBF)]]
*Dave Garrett becomes first GCMRC Chief

==1995==
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)
*Establishment of the Grand Canyon Monitoring and Research Center (GCMRC)
*The Glen Canyon Dam Environmental Impact Statement as required by the Grand Canyon Protection Act is completed.
*The Grand Canyon National Park General Management Plan

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]

==1993==
*Bruce Babbitt becomes Secretary of the Interior
*Dan Beard becomes USBR Commissioner

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act ]

==1991==
*Interim operating criteria for Glen Canyon Dam implemented
*The 1990-91 Experimental Flows
*Razorback Sucker and Kanab Ambersnail federally listed as endangered

==1990==
*Beginning of Interim Operating Criteria
*The 1990-91 Experimental Flows
*Formulative discussions on the concept of HFEs begin lead by Duncan Patton

==1989==
*Manuel Lujan becomes Secretary of the Interior and orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem

==1988==
*Salt Lake City Area Integrated Projects(CRSP) passed after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1986==

==1985==

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1984 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1975==
*Grand Canyon National Park Enlargement Act passed

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1972==
*Last verified record of [https://gcdamp.com/index.php/Colorado_Pikeminnow Colorado Pikeminnow] caught in Grand Canyon at Havasu Creek

==1971==

==1970==
*[https://www.usbr.gov/lc/region/pao/pdfiles/opcriter.pdf Long-range Operating Criteria (LROC)] developed for Glen Canyon Dam operations

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1968==
*Colorado River Basin Project Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1966==
*National Historic Preservation Act passed
*Crystal rapid forms after a large flash flood from Crystal Creek

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1963==
*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Court held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1935 ==
*Hoover Dam completed

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” ]

== 1919 ==
*Grand Canyon National Park created

== 1916 ==
*National Park Service Organic Act passed

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1869 ==
*Major John Wesley Powell leads first recorded expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

==*11,000 BP==
*Paleo-Indian peoples occupy Grand Canyon region

GCDAMP History Time-Line -Years

2026-09-29T15:43:29Z

Cellsworth:

__NOTOC__
==2027==

==2026==
*Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]
*Bright Angel creek floods

==2025==
*The [https://gcdamp.com/index.php/The_-12_Mile_Slough -12 Mile Slough] gets renovated
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass
*Dragon-Bravo fire

==2024==
*[https://gcdamp.com/index.php/Humpback_Chub_Page Humpback chub] population in Grand Canyon grows to 70,000 adults (40,000–200,000; 95% credible interval)
*The LTEMP EIS is modified to allow for releases to control smallmouth bass and to modify the sediment accounting windows for HFEs
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2023==
*[[The 2023 Spring HFE| Spring HFE: 39,500 cfs for 72h]]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry

==2022==
*Release temperatures at Glen Canyon Dam reach 20.5C with low reservoir elevations
*[[A 2022 Fall HFE| A Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry

==2021==
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow Spring Disturbance Flow]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*Andrew Schultz becomes GCMRC Chief

==2020==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*COVID moves all meetings for the year to remote
*Ed Keable becomes superintendent of Grand Canyon National Park

==2019==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://www.usbr.gov/uc/progact/amp/amwg/2019-08-21-amwg-meeting/20190821-GlenCanyonDamAdaptiveManagementProgramGuidance-508-UCRO.pdf DOI Guidance from Dr. Tim Petty]

==2018==
*[[The 2018 Fall HFE| Fall HFE]]: 38,100 cfs for 60h
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2017==
*Ryan Zinke becomes Secretary of the Interior

==2016==
*Publication of the [https://gcdamp.com/index.php/Long-term_Experimental_and_Management_Plan_(LTEMP) LTEMP EIS]
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2015==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] and [https://gcdamp.com/index.php/Green_Sunfish_Page green sunfish] start reproducing in Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of Triennial Budget and Workplans
*Scott VanderKooi becomes GCMRC Chief

==2014==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 Fall HFE]: 37,500 cfs for 96h
*Galahad Point fire and flood eliminates the humpback chub translocation in Shinumo Creek

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 Fall HFE]: 34,100 cfs for 96h
*Sally Jewell becomes Secretary of the Interior

==2012==
*[https://gcdamp.com/index.php/Portal:Desired_Future_Conditions_-DFCs Development of the Desired Future Conditions (DFCs)]
*Publication of the [https://gcdamp.com/index.php/The_HFE_Page High Flow Experiment Protocol]
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]
*The 2011 Equalization flows
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]
*Start of Biennial Budget and Workplans
*Jack Schmidt becomes GCMRC Chief
*Dave Uberuaga becomes Superintendent of GCNP

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]
*Ken Salazar becomes Secretary of the Interior
*Anne Castle becomes Assistant Secretary for Water and Science

==2008==
*USFWS Biological Opinion identifies concerns with constructing a [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)] that can only release warm water
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs Spring HFE]
*Grand Canyon Trust files suit against USBR, USFWS, and others contending operations at Glen Canyon Dam rand counter to their obligations to comply with the ESA, NEPA, and Administrative Policy Act
*GCDAMP budget was capped

==2007==
*Pearce Ferry Rapid forms
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]
*Steve Martin becomes superintendent of GCNP

==2006==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Draft Long-Term Experimental Plan Environmental Plan (LTEP)
*Dirk Kempthorne becomes Secretary of the Interior

==2005==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)

==2004==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*[https://pubs.usgs.gov/fs/2011/3012/ Fall HFE]
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]

==2003==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River (2003-2006)
*Fluctuating trout suppression flows from January through March implemented and continued through 2005.

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 years of an experimental design proposed by the GCMRC.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish
*Draft GCDAMP Strategic Plan for the developed by program managers.
*Gale Norton becomes Secretary of the Interior
*GCMRC moves from the office of the Assistant Secretary of the Interior to the US Geological Survey

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP
*[https://gcdamp.com/images_gcdamp_com/6/62/Appendix_B_%28Guidance_Document%29_Loveless.doc Glen Canyon Dam Adaptive Management Program AMWG FACA Committee Guidance (The 1999 Loveless Document)]

==1998==
*GCMRC is moved from USBR to the office of the Assistant Secretary of the Department of the Interior
*Barry Gold becomes acting GCRMC Chief

==1997==
*AMWG and TWG fully established
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*Formation of a GCDAMP Strategic Planning Subcommittee (1997-2000)
*Reclamation begins a Value Planning Study for a warm-water [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)]
*[[The 1997 Habitat Maintenance Flow (HMF)|Habitat Maintenance Flow (HMF)]]
*Mary Orton joins AMWG as mediator

==1996==
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement selects Modified Low Fluctuating Flows (MLFF) as the preferred alternative.
*[[The 1996 Spring HFE| Beach/Habitat-Building Flow (BHBF)]]
*Dave Garrett becomes first GCMRC Chief

==1995==
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)
*Establishment of the Grand Canyon Monitoring and Research Center (GCMRC)
*The Glen Canyon Dam Environmental Impact Statement as required by the Grand Canyon Protection Act is completed.
*The Grand Canyon National Park General Management Plan

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]

==1993==
*Bruce Babbitt becomes Secretary of the Interior
*Dan Beard becomes USBR Commissioner

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act ]

==1991==
*Interim operating criteria for Glen Canyon Dam implemented
*The 1990-91 Experimental Flows
*Razorback Sucker and Kanab Ambersnail federally listed as endangered

==1990==
*Beginning of Interim Operating Criteria
*The 1990-91 Experimental Flows
*Formulative discussions on the concept of HFEs begin lead by Duncan Patton

==1989==
*Manuel Lujan becomes Secretary of the Interior and orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem

==1988==
*Salt Lake City Area Integrated Projects(CRSP) passed after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1986==

==1985==

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1984 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1975==
*Grand Canyon National Park Enlargement Act passed

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1972==
*Last verified record of [https://gcdamp.com/index.php/Colorado_Pikeminnow Colorado Pikeminnow] caught in Grand Canyon at Havasu Creek

==1971==

==1970==
*[https://www.usbr.gov/lc/region/pao/pdfiles/opcriter.pdf Long-range Operating Criteria (LROC)] developed for Glen Canyon Dam operations

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1968==
*Colorado River Basin Project Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1966==
*National Historic Preservation Act passed
*Crystal rapid forms after a large flash flood from Crystal Creek

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1963==
*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Court held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1935 ==
*Hoover Dam completed

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” ]

== 1919 ==
*Grand Canyon National Park created

== 1916 ==
*National Park Service Organic Act passed

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1869 ==
*Major John Wesley Powell leads first recorded expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

==*11,000 BP==
*Paleo-Indian peoples occupy Grand Canyon region

GCDAMP History Time-Line -Years

2026-09-29T15:06:31Z

Cellsworth:

__NOTOC__
==2027==

==2026==
*Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]

==2025==
*The [https://gcdamp.com/index.php/The_-12_Mile_Slough -12 Mile Slough] gets renovated
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2024==
*[https://gcdamp.com/index.php/Humpback_Chub_Page Humpback chub] population in Grand Canyon grows to 70,000 adults (40,000–200,000; 95% credible interval)
*The LTEMP EIS is modified to allow for releases to control smallmouth bass and to modify the sediment accounting windows for HFEs
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2023==
*[[The 2023 Spring HFE| Spring HFE: 39,500 cfs for 72h]]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry

==2022==
*Release temperatures at Glen Canyon Dam reach 20.5C with low reservoir elevations
*[[A 2022 Fall HFE| A Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry

==2021==
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow Spring Disturbance Flow]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*Andrew Schultz becomes GCMRC Chief

==2020==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*COVID moves all meetings for the year to remote
*Ed Keable becomes superintendent of Grand Canyon National Park

==2019==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://www.usbr.gov/uc/progact/amp/amwg/2019-08-21-amwg-meeting/20190821-GlenCanyonDamAdaptiveManagementProgramGuidance-508-UCRO.pdf DOI Guidance from Dr. Tim Petty]

==2018==
*[[The 2018 Fall HFE| Fall HFE]]: 38,100 cfs for 60h
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2017==
*Ryan Zinke becomes Secretary of the Interior

==2016==
*Publication of the [https://gcdamp.com/index.php/Long-term_Experimental_and_Management_Plan_(LTEMP) LTEMP EIS]
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2015==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] and [https://gcdamp.com/index.php/Green_Sunfish_Page green sunfish] start reproducing in Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of Triennial Budget and Workplans
*Scott VanderKooi becomes GCMRC Chief

==2014==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 Fall HFE]: 37,500 cfs for 96h

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 Fall HFE]: 34,100 cfs for 96h
*Sally Jewell becomes Secretary of the Interior

==2012==
*[https://gcdamp.com/index.php/Portal:Desired_Future_Conditions_-DFCs Development of the Desired Future Conditions (DFCs)]
*Publication of the [https://gcdamp.com/index.php/The_HFE_Page High Flow Experiment Protocol]
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]
*The 2011 Equalization flows
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]
*Start of Biennial Budget and Workplans
*Jack Schmidt becomes GCMRC Chief
*Dave Uberuaga becomes Superintendent of GCNP

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]
*Ken Salazar becomes Secretary of the Interior
*Anne Castle becomes Assistant Secretary for Water and Science

==2008==
*USFWS Biological Opinion identifies concerns with constructing a [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)] that can only release warm water
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs Spring HFE]
*Grand Canyon Trust files suit against USBR, USFWS, and others contending operations at Glen Canyon Dam rand counter to their obligations to comply with the ESA, NEPA, and Administrative Policy Act
*GCDAMP budget was capped

==2007==
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]
*Steve Martin becomes superintendent of GCNP

==2006==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*Long-Term Experimental Plan Environmental Plan (LTEP)
*Dirk Kempthorne becomes Secretary of the Interior

==2005==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River

==2004==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*[https://pubs.usgs.gov/fs/2011/3012/ Fall HFE]
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]

==2003==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*Fluctuating trout suppression flows from January through March implemented and continued through 2005.

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 years of an experimental design proposed by the GCMRC.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish
*Draft GCDAMP Strategic Plan for the developed by program managers.
*Gale Norton becomes Secretary of the Interior
*GCMRC moves from the office of the Assistant Secretary of the Interior to the US Geological Survey

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP
*[https://gcdamp.com/images_gcdamp_com/6/62/Appendix_B_%28Guidance_Document%29_Loveless.doc Glen Canyon Dam Adaptive Management Program AMWG FACA Committee Guidance (The 1999 Loveless Document)]

==1998==
*GCMRC is moved from USBR to the office of the Assistant Secretary of the Department of the Interior
*Barry Gold becomes acting GCRMC Chief

==1997==
*AMWG and TWG fully established
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*Formation of a GCDAMP Strategic Planning Subcommittee (1997-2000)
*Reclamation begins a Value Planning Study for a warm-water [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)]
*[[The 1997 Habitat Maintenance Flow (HMF)|Habitat Maintenance Flow (HMF)]]
*Mary Orton joins AMWG as mediator

==1996==
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement selects Modified Low Fluctuating Flows (MLFF) as the preferred alternative.
*[[The 1996 Spring HFE| Beach/Habitat-Building Flow (BHBF)]]
*Dave Garrett becomes first GCMRC Chief

==1995==
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)
*Establishment of the Grand Canyon Monitoring and Research Center (GCMRC)
*The Glen Canyon Dam Environmental Impact Statement as required by the Grand Canyon Protection Act is completed.
*The Grand Canyon National Park General Management Plan

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]

==1993==
*Bruce Babbitt becomes Secretary of the Interior
*Dan Beard becomes USBR Commissioner

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act ]

==1991==
*Interim operating criteria for Glen Canyon Dam implemented
*The 1990-91 Experimental Flows
*Razorback Sucker and Kanab Ambersnail federally listed as endangered

==1990==
*Beginning of Interim Operating Criteria
*The 1990-91 Experimental Flows
*Formulative discussions on the concept of HFEs begin lead by Duncan Patton

==1989==
*Manuel Lujan becomes Secretary of the Interior and orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem

==1988==
*Salt Lake City Area Integrated Projects(CRSP) passed after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1986==

==1985==

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1984 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1975==
*Grand Canyon National Park Enlargement Act passed

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1972==
*Last verified record of [https://gcdamp.com/index.php/Colorado_Pikeminnow Colorado Pikeminnow] caught in Grand Canyon at Havasu Creek

==1971==

==1970==
*[https://www.usbr.gov/lc/region/pao/pdfiles/opcriter.pdf Long-range Operating Criteria (LROC)] developed for Glen Canyon Dam operations

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1968==
*Colorado River Basin Project Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1966==
*National Historic Preservation Act passed

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1963==
*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Court held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1935 ==
*Hoover Dam completed

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” ]

== 1919 ==
*Grand Canyon National Park created

== 1916 ==
*National Park Service Organic Act passed

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1869 ==
*Major John Wesley Powell leads first recorded expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

==*11,000 BP==
*Paleo-Indian peoples occupy Grand Canyon region

Glen Canyon Dam Adaptive Management ADMINISTRATIVE HISTORY

2026-09-29T01:17:16Z

Cellsworth:

Glen Canyon Dam Adaptive Management ADMINISTRATIVE HISTORY

2026-09-29T01:16:13Z

Cellsworth:

GCDAMP History Time-Line -Years

2026-09-29T01:09:08Z

Cellsworth:

__NOTOC__
==2027==

==2026==
*Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]

==2025==
*The [https://gcdamp.com/index.php/The_-12_Mile_Slough -12 Mile Slough] gets renovated
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2024==
*[https://gcdamp.com/index.php/Humpback_Chub_Page Humpback chub] population grows to 70,000 adults (40,000–200,000; 95% credible interval) in Grand Canyon
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2023==
*[[The 2023 Spring HFE| Spring HFE: 39,500 cfs for 72h]]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry

==2022==
*[[A 2022 Fall HFE| A Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry

==2021==
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow Spring Disturbance Flow]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry

==2020==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*COVID moves all meetings for the year to remote

==2019==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2018==
*[[The 2018 Fall HFE| Fall HFE]]: 38,100 cfs for 60h
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2017==

==2016==
*Publication of the [https://gcdamp.com/index.php/Long-term_Experimental_and_Management_Plan_(LTEMP) LTEMP EIS]
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2015==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] and [https://gcdamp.com/index.php/Green_Sunfish_Page green sunfish] start reproducing in Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of a Triennial Budget and Workplan

==2014==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 Fall HFE]: 37,500 cfs for 96h

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 Fall HFE]: 34,100 cfs for 96h

==2012==
*[https://gcdamp.com/index.php/Portal:Desired_Future_Conditions_-DFCs Development of the Desired Future Conditions (DFCs)]
*Publication of the [https://gcdamp.com/index.php/The_HFE_Page High Flow Experiment Protocol]
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]
*The 2011 Equalization flows
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]
*Start of a Biennial Budget and Workplan

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]

==2008==
*USFWS Biological Opinion identifies concerns with constructing a [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)] that can only release warm water
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs Spring HFE]

==2007==
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]

==2006==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*Long-Term Experimental Plan Environmental Plan (LTEP)

==2005==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River

==2004==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*[https://pubs.usgs.gov/fs/2011/3012/ Fall HFE]
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]

==2003==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*Fluctuating nonnative fish suppression releases from January through March implemented and continued through 2005.

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 yr of an experimental design proposed by the GCMRC.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish in 2001.
*Draft ''Strategic Plan for the GCDAMP'' developed by program managers.

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP

==1998==

==1997==
*AMWG and TWG fully established
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*Formation of a GCDAMP Strategic Planning Subcommittee (1997-2000)
*Reclamation begins a Value Planning Study for a warm-water [https://gcdamp.com/index.php/TCD_Learning_Page Temperature Control Device (TCD)]
*[[The 1997 Habitat Maintenance Flow (HMF)|Habitat Maintenance Flow (HMF)]]

==1996==
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement to comply with consultation requirements of the Grand Canyon Protection Act of 1992. (Signed by Secretary of the Interior Bruce Babbitt)
*[[The 1996 Spring HFE| Beach/Habitat-Building Flow (BHBF)]]

==1995==
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)
*Establishment of the Grand Canyon Monitoring and Research Center (GCMRC)

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]

==1993==

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act ]

==1991==
*Interim operating criteria for Glen Canyon Dam implemented.
*The 1990-91 Experimental Flows
*Razorback Sucker and Kanab Ambersnail federally listed as endangered.

==1990==
*Beginning of Interim Operating Criteria
*The 1990-91 Experimental Flows

==1989==
*Secretary of the Interior Lujan orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem

==1988==
*Salt Lake City Area Integrated Projects(CRSP) passed-1989 after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1986==

==1985==

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1984 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1975==
*Grand Canyon National Park Enlargement Act passed

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1972==
*Last verified record of [https://gcdamp.com/index.php/Colorado_Pikeminnow Colorado Pikeminnow] caught in Grand Canyon at Havasu Creek

==1971==

==1970==
*[https://www.usbr.gov/lc/region/pao/pdfiles/opcriter.pdf Long-range Operating Criteria (LROC)] developed for Glen Canyon Dam operations

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1968==
*Colorado River Basin Project Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1966==
*National Historic Preservation Act passed

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1963==
*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Cort held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1935 ==
*Hoover Dam completed

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” (July 25th)]

== 1919 ==
*Grand Canyon National Park created

== 1916 ==
*National Park Service Organic Act passed

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1869 ==
*Major John Wesley Powell leads first recored expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

==*11,000 BP==
*Paleo-Indian peoples occupy Grand Canyon region

GCDAMP History Time-Line -Years

2026-09-29T00:59:33Z

Cellsworth:

__NOTOC__
==2027==

==2026==
*Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]

==2025==
*The [https://gcdamp.com/index.php/The_-12_Mile_Slough -12 Mile Slough] gets renovated
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2024==
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass
*[https://gcdamp.com/index.php/Humpback_Chub_Page Humpback chub] population grows to 70,000 adults (40,000–200,000; 95% credible interval) in Grand Canyon

==2023==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[[The 2023 Spring HFE| Spring HFE: 39,500 cfs for 72h]]

==2022==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[[A 2022 Fall HFE| A Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2021==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow Spring Disturbance Flow]

==2020==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*COVID moves all meetings for the year to remote

==2019==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2018==
*[[The 2018 Fall HFE| Fall HFE]]: 38,100 cfs for 60h
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2017==

==2016==
*Publication of the [https://gcdamp.com/index.php/Long-term_Experimental_and_Management_Plan_(LTEMP) LTEMP EIS]
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2015==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] and [https://gcdamp.com/index.php/Green_Sunfish_Page green sunfish] start reproducing in Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of a Triennial Budget and Workplan

==2014==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 Fall HFE]: 37,500 cfs for 96h

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 Fall HFE]: 34,100 cfs for 96h

==2012==
*[https://gcdamp.com/index.php/Portal:Desired_Future_Conditions_-DFCs Desired Future Conditions -DFCs]
*Publication of the [https://gcdamp.com/index.php/The_HFE_Page High Flow Experiment Protocol]
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]
*The 2011 Equalization flows
*Start of a Biennial Budget and Workplan
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]

==2008==
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs Spring HFE]

==2007==
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]

==2006==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*Long-Term Experimental Plan Environmental Plan (LTEP)

==2005==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River

==2004==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*[https://pubs.usgs.gov/fs/2011/3012/ Fall HFE]
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]

==2003==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*Fluctuating nonnative fish suppression releases from January through March implemented and continued through 2005.

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 yr of an experimental design proposed by the GCMRC.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish in 2001.
*Draft ''Strategic Plan for the GCDAMP'' developed by program managers.

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP

==1998==

==1997==
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*[[The 1997 Habitat Maintenance Flow (HMF)|Habitat Maintenance Flow (HMF)]]
*Strategic Planning Subcommittee (1997-2000)
*AMWG and TWG fully established

==1996==
*[[The 1996 Spring HFE| Beach/Habitat-Building Flow (BHBF)]]
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement to comply with consultation requirements of the Grand Canyon Protection Act of 1992. (Signed by Secretary of the Interior Bruce Babbitt)

==1995==
*Establishment of the Grand Canyon Monitoring and Research Center
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]

==1993==

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act ]

==1991==
*The 1990-91 Experimental Flows
*Interim operating criteria for Glen Canyon Dam implemented.
*Razorback Sucker and Kanab Ambersnail federally listed as endangered.

==1990==
*The 1990-91 Experimental Flows
*Beginning of Interim Operating Criteria

==1989==
*Secretary of the Interior Lujan orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem

==1988==
*Salt Lake City Area Integrated Projects(CRSP) passed-1989 after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1986==

==1985==

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1984 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1975==
*Grand Canyon National Park Enlargement Act passed

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1972==
*Last verified record of [https://gcdamp.com/index.php/Colorado_Pikeminnow Colorado Pikeminnow] caught in Grand Canyon at Havasu Creek

==1971==

==1970==
*[https://www.usbr.gov/lc/region/pao/pdfiles/opcriter.pdf Long-range Operating Criteria (LROC)] developed for Glen Canyon Dam operations

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1968==
*Colorado River Basin Project Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1966==
*National Historic Preservation Act passed

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1963==
*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Cort held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1935 ==
*Hoover Dam completed

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” (July 25th)]

== 1919 ==
*Grand Canyon National Park created

== 1916 ==
*National Park Service Organic Act passed

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1869 ==
*Major John Wesley Powell leads first recored expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

==*11,000 BP==
*Paleo-Indian peoples occupy Grand Canyon region

GCDAMP History Time-Line -Years

2026-09-29T00:59:10Z

Cellsworth:

__NOTOC__
==2027==

==2026==
*Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]

==2025==
*The [https://gcdamp.com/index.php/The_-12_Mile_Slough -12 Mile Slough] gets renovated
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2024==
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass
*[https://gcdamp.com/index.php/Humpback_Chub_Page Humpback chub] population grows to 70,000 adults (40 000–200 000; 95% credible interval) in Grand Canyon

==2023==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[[The 2023 Spring HFE| Spring HFE: 39,500 cfs for 72h]]

==2022==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[[A 2022 Fall HFE| A Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2021==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow Spring Disturbance Flow]

==2020==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*COVID moves all meetings for the year to remote

==2019==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2018==
*[[The 2018 Fall HFE| Fall HFE]]: 38,100 cfs for 60h
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2017==

==2016==
*Publication of the [https://gcdamp.com/index.php/Long-term_Experimental_and_Management_Plan_(LTEMP) LTEMP EIS]
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2015==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] and [https://gcdamp.com/index.php/Green_Sunfish_Page green sunfish] start reproducing in Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of a Triennial Budget and Workplan

==2014==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 Fall HFE]: 37,500 cfs for 96h

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 Fall HFE]: 34,100 cfs for 96h

==2012==
*[https://gcdamp.com/index.php/Portal:Desired_Future_Conditions_-DFCs Desired Future Conditions -DFCs]
*Publication of the [https://gcdamp.com/index.php/The_HFE_Page High Flow Experiment Protocol]
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]
*The 2011 Equalization flows
*Start of a Biennial Budget and Workplan
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]

==2008==
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs Spring HFE]

==2007==
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]

==2006==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*Long-Term Experimental Plan Environmental Plan (LTEP)

==2005==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River

==2004==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*[https://pubs.usgs.gov/fs/2011/3012/ Fall HFE]
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]

==2003==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*Fluctuating nonnative fish suppression releases from January through March implemented and continued through 2005.

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 yr of an experimental design proposed by the GCMRC.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish in 2001.
*Draft ''Strategic Plan for the GCDAMP'' developed by program managers.

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP

==1998==

==1997==
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*[[The 1997 Habitat Maintenance Flow (HMF)|Habitat Maintenance Flow (HMF)]]
*Strategic Planning Subcommittee (1997-2000)
*AMWG and TWG fully established

==1996==
*[[The 1996 Spring HFE| Beach/Habitat-Building Flow (BHBF)]]
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement to comply with consultation requirements of the Grand Canyon Protection Act of 1992. (Signed by Secretary of the Interior Bruce Babbitt)

==1995==
*Establishment of the Grand Canyon Monitoring and Research Center
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]

==1993==

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act ]

==1991==
*The 1990-91 Experimental Flows
*Interim operating criteria for Glen Canyon Dam implemented.
*Razorback Sucker and Kanab Ambersnail federally listed as endangered.

==1990==
*The 1990-91 Experimental Flows
*Beginning of Interim Operating Criteria

==1989==
*Secretary of the Interior Lujan orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem

==1988==
*Salt Lake City Area Integrated Projects(CRSP) passed-1989 after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1986==

==1985==

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1984 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1975==
*Grand Canyon National Park Enlargement Act passed

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1972==
*Last verified record of [https://gcdamp.com/index.php/Colorado_Pikeminnow Colorado Pikeminnow] caught in Grand Canyon at Havasu Creek

==1971==

==1970==
*[https://www.usbr.gov/lc/region/pao/pdfiles/opcriter.pdf Long-range Operating Criteria (LROC)] developed for Glen Canyon Dam operations

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1968==
*Colorado River Basin Project Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1966==
*National Historic Preservation Act passed

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1963==
*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Cort held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1935 ==
*Hoover Dam completed

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” (July 25th)]

== 1919 ==
*Grand Canyon National Park created

== 1916 ==
*National Park Service Organic Act passed

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1869 ==
*Major John Wesley Powell leads first recored expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

==*11,000 BP==
*Paleo-Indian peoples occupy Grand Canyon region

GCDAMP History Time-Line -Years

2026-09-29T00:55:20Z

Cellsworth:

__NOTOC__
==2027==

==2026==
*Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]

==2025==
*The [https://gcdamp.com/index.php/The_-12_Mile_Slough -12 Mile Slough] gets renovated
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2024==
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2023==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[[The 2023 Spring HFE| Spring HFE: 39,500 cfs for 72h]]

==2022==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[[A 2022 Fall HFE| A Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2021==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow Spring Disturbance Flow]

==2020==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*COVID moves all meetings for the year to remote

==2019==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2018==
*[[The 2018 Fall HFE| Fall HFE]]: 38,100 cfs for 60h
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2017==

==2016==
*Publication of the [https://gcdamp.com/index.php/Long-term_Experimental_and_Management_Plan_(LTEMP) LTEMP EIS]
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2015==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] and [https://gcdamp.com/index.php/Green_Sunfish_Page green sunfish] start reproducing in Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of a Triennial Budget and Workplan

==2014==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 Fall HFE]: 37,500 cfs for 96h

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 Fall HFE]: 34,100 cfs for 96h

==2012==
*[https://gcdamp.com/index.php/Portal:Desired_Future_Conditions_-DFCs Desired Future Conditions -DFCs]
*Publication of the [https://gcdamp.com/index.php/The_HFE_Page High Flow Experiment Protocol]
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]
*The 2011 Equalization flows
*Start of a Biennial Budget and Workplan
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]

==2008==
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs Spring HFE]

==2007==
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]

==2006==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*Long-Term Experimental Plan Environmental Plan (LTEP)

==2005==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River

==2004==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*[https://pubs.usgs.gov/fs/2011/3012/ Fall HFE]
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]

==2003==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*Fluctuating nonnative fish suppression releases from January through March implemented and continued through 2005.

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 yr of an experimental design proposed by the GCMRC.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish in 2001.
*Draft ''Strategic Plan for the GCDAMP'' developed by program managers.

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP

==1998==

==1997==
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*[[The 1997 Habitat Maintenance Flow (HMF)|Habitat Maintenance Flow (HMF)]]
*Strategic Planning Subcommittee (1997-2000)
*AMWG and TWG fully established

==1996==
*[[The 1996 Spring HFE| Beach/Habitat-Building Flow (BHBF)]]
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement to comply with consultation requirements of the Grand Canyon Protection Act of 1992. (Signed by Secretary of the Interior Bruce Babbitt)

==1995==
*Establishment of the Grand Canyon Monitoring and Research Center
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]

==1993==

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act ]

==1991==
*The 1990-91 Experimental Flows
*Interim operating criteria for Glen Canyon Dam implemented.
*Razorback Sucker and Kanab Ambersnail federally listed as endangered.

==1990==
*The 1990-91 Experimental Flows
*Beginning of Interim Operating Criteria

==1989==
*Secretary of the Interior Lujan orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem

==1988==
*Salt Lake City Area Integrated Projects(CRSP) passed-1989 after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1986==

==1985==

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1984 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1975==
*Grand Canyon National Park Enlargement Act passed

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1972==
*Last verified record of [https://gcdamp.com/index.php/Colorado_Pikeminnow Colorado Pikeminnow] caught in Grand Canyon at Havasu Creek

==1971==

==1970==
*[https://www.usbr.gov/lc/region/pao/pdfiles/opcriter.pdf Long-range Operating Criteria (LROC)] developed for Glen Canyon Dam operations

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1968==
*Colorado River Basin Project Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1966==
*National Historic Preservation Act passed

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1963==
*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Cort held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1935 ==
*Hoover Dam completed

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” (July 25th)]

== 1919 ==
*Grand Canyon National Park created

== 1916 ==
*National Park Service Organic Act passed

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1869 ==
*Major John Wesley Powell leads first recored expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

==*11,000 BP==
*Paleo-Indian peoples occupy Grand Canyon region

GCDAMP History Time-Line -Years

2026-09-29T00:52:25Z

Cellsworth:

__NOTOC__
==2027==

==2026==
*Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]

==2025==
*The [https://gcdamp.com/index.php/The_-12_Mile_Slough -12 Mile Slough] gets renovated
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2024==
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2023==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[[The 2023 Spring HFE| Spring HFE: 39,500 cfs for 72h]]

==2022==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[[A 2022 Fall HFE| A Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2021==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow Spring Disturbance Flow]

==2020==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*COVID moves all meetings for the year to remote

==2019==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2018==
*[[The 2018 Fall HFE| Fall HFE]]: 38,100 cfs for 60h
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2017==

==2016==
*Publication of the [https://gcdamp.com/index.php/Long-term_Experimental_and_Management_Plan_(LTEMP) LTEMP EIS]
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2015==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] and [https://gcdamp.com/index.php/Green_Sunfish_Page green sunfish] start reproducing in Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of a Triennial Budget and Workplan

==2014==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 Fall HFE]: 37,500 cfs for 96h

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 Fall HFE]: 34,100 cfs for 96h

==2012==
*[https://gcdamp.com/index.php/Portal:Desired_Future_Conditions_-DFCs Desired Future Conditions -DFCs]
*Publication of the High Flow Experiment Protocol
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]
*The 2011 Equalization flows
*Start of a Biennial Budget and Workplan
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study Fall Steady Flow Experiment]

==2008==
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs Spring HFE]

==2007==
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]

==2006==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*Long-Term Experimental Plan Environmental Plan (LTEP)

==2005==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River

==2004==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*[https://pubs.usgs.gov/fs/2011/3012/ Fall HFE]
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]

==2003==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*Fluctuating nonnative fish suppression releases from January through March implemented and continued through 2005.

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 yr of an experimental design proposed by the GCMRC.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish in 2001.
*Draft ''Strategic Plan for the GCDAMP'' developed by program managers.

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP

==1998==

==1997==
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*[[The 1997 Habitat Maintenance Flow (HMF)|Habitat Maintenance Flow (HMF)]]
*Strategic Planning Subcommittee (1997-2000)
*AMWG and TWG fully established

==1996==
*[[The 1996 Spring HFE| Beach/Habitat-Building Flow (BHBF)]]
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement to comply with consultation requirements of the Grand Canyon Protection Act of 1992. (Signed by Secretary of the Interior Bruce Babbitt)

==1995==
*Establishment of the Grand Canyon Monitoring and Research Center
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]

==1993==

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act ]

==1991==
*The 1990-91 Experimental Flows
*Interim operating criteria for Glen Canyon Dam implemented.
*Razorback Sucker and Kanab Ambersnail federally listed as endangered.

==1990==
*The 1990-91 Experimental Flows
*Beginning of Interim Operating Criteria

==1989==
*Secretary of the Interior Lujan orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem

==1988==
*Salt Lake City Area Integrated Projects(CRSP) passed-1989 after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1986==

==1985==

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1984 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1975==
*Grand Canyon National Park Enlargement Act passed

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1972==
*Last verified record of [https://gcdamp.com/index.php/Colorado_Pikeminnow Colorado Pikeminnow] caught in Grand Canyon at Havasu Creek

==1971==

==1970==
*[https://www.usbr.gov/lc/region/pao/pdfiles/opcriter.pdf Long-range Operating Criteria (LROC)] developed for Glen Canyon Dam operations

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1968==
*Colorado River Basin Project Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1966==
*National Historic Preservation Act passed

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1963==
*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Cort held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1935 ==
*Hoover Dam completed

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” (July 25th)]

== 1919 ==
*Grand Canyon National Park created

== 1916 ==
*National Park Service Organic Act passed

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1869 ==
*Major John Wesley Powell leads first recored expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

==*11,000 BP==
*Paleo-Indian peoples occupy Grand Canyon region

GCDAMP History Time-Line -Years

2026-09-29T00:47:25Z

Cellsworth:

__NOTOC__
==2027==

==2026==
*Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]

==2025==
*The [https://gcdamp.com/index.php/The_-12_Mile_Slough -12 Mile Slough] gets renovated
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2024==
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2023==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[[The 2023 Spring HFE| The 2023 Spring HFE: 39,500 cfs for 72h]]

==2022==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[[A 2022 Fall HFE| A 2022 Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2021==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow Spring Disturbance Flow]

==2020==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] incentivized harvest at Lees Ferry
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]
*COVID moves all meetings for the year to remote

==2019==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2018==
*[[The 2018 Fall HFE]]: 38,100 cfs for 60h
*[https://gcdamp.com/index.php/The_Bugflow_Experiment Bugflow Experiment]

==2017==

==2016==
*Publication of the [https://gcdamp.com/index.php/Long-term_Experimental_and_Management_Plan_(LTEMP) LTEMP EIS]
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2015==
*[https://gcdamp.com/index.php/Brown_Trout Brown trout] and [https://gcdamp.com/index.php/Green_Sunfish_Page green sunfish] start reproducing in Lees Ferry
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of a Triennial Budget and Workplan

==2014==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 The 2014 Fall HFE]: 37,500 cfs for 96h

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 The 2013 Fall HFE]: 34,100 cfs for 96h

==2012==
*[https://gcdamp.com/index.php/Portal:Desired_Future_Conditions_-DFCs Desired Future Conditions -DFCs]
*Publication of the High Flow Experiment Protocol
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 The 2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study 2009-2011 Fall Steady Flow Experiment]
*The 2011 Equalization flows
*Start of a Biennial Budget and Workplan
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study 2009-2011 Fall Steady Flow Experiment]

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study 2009-2011 Fall Steady Flow Experiment]

==2008==
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs The 2008 Spring HFE]

==2007==
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]

==2006==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*Long-Term Experimental Plan Environmental Plan (LTEP)

==2005==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River

==2004==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*[https://pubs.usgs.gov/fs/2011/3012/ The 2004 Fall HFE]
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]

==2003==
*[https://gcdamp.com/index.php/Trout_Reduction_Efforts Trout removals] from the confluence with the Little Colorado River
*Fluctuating nonnative fish suppression releases from January through March implemented and continued through 2005.

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 yr of an experimental design proposed by the GCMRC.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish in 2001.
*Draft ''Strategic Plan for the GCDAMP'' developed by program managers.

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The 2000 Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP

==1998==

==1997==
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*[[The 1997 Habitat Maintenance Flow (HMF)]]
*Strategic Planning Subcommittee (1997-2000)
*AMWG and TWG fully established

==1996==
*[[The 1996 Spring HFE| The 1996 Beach/Habitat-Building Flow (BHBF)]]
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement to comply with consultation requirements of the Grand Canyon Protection Act of 1992. (Signed by Secretary of the Interior Bruce Babbitt)

==1995==
*Establishment of the Grand Canyon Monitoring and Research Center
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]

==1993==

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act of 1992] passed

==1991==
*The 1990-91 Experimental Flows
*Interim operating criteria for Glen Canyon Dam implemented.
*Razorback Sucker and Kanab Ambersnail federally listed as endangered.

==1990==
*The 1990-91 Experimental Flows
*Beginning of Interim Operating Criteria

==1989==
*Secretary of the Interior Lujan orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem

==1988==
*Salt Lake City Area Integrated Projects(CRSP)passed-1989 after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1986==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983-86 Floods]

==1985==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983-86 Floods]

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983-86 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983-86 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1975==
*Grand Canyon National Park Enlargement Act passed

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1972==
*Last verified record of [https://gcdamp.com/index.php/Colorado_Pikeminnow Colorado Pikeminnow] caught in Grand Canyon at Havasu Creek

==1971==

==1970==
*[https://www.usbr.gov/lc/region/pao/pdfiles/opcriter.pdf Long-range Operating Criteria (LROC)] developed for Glen Canyon Dam operations

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1968==
*Colorado River Basin Project Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1966==
*National Historic Preservation Act passed

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1963==
*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Cort held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1935 ==
*Hoover Dam completed

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” (July 25th)]

== 1919 ==
*Grand Canyon National Park created

== 1916 ==
*National Park Service Organic Act passed

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1869 ==
*Major John Wesley Powell leads first recored expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

==*11,000 BP==
*Paleo-Indian peoples occupy Grand Canyon region

GCDAMP History Time-Line -Years

2026-09-28T23:20:03Z

Cellsworth:

__NOTOC__
==2027==

==2026==
*Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]

==2025==
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2024==
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2023==
*[[The 2023 Spring HFE| The 2023 Spring HFE: 39,500 cfs for 72h]]

==2022==
*[[A 2022 Fall HFE| A 2022 Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[https://gcdamp.com/index.php/The_Bugflow_Experiment The 2022 Bugflow Experiment]

==2021==
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow The 2021 Spring Disturbance Flow]

==2020==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment The 2020 Bugflow Experiment]
*COVID moves all meetings for the year to remote

==2019==
*[https://gcdamp.com/index.php/The_Bugflow_Experiment The 2019 Bugflow Experiment]

==2018==
*[[The 2018 Fall HFE]]: 38,100 cfs for 60h
*[https://gcdamp.com/index.php/The_Bugflow_Experiment The 2018 Bugflow Experiment]

==2017==

==2016==
*Publication of the LTEMP EIS
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2015==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of a Triennial Budget and Workplan

==2014==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 The 2014 Fall HFE]: 37,500 cfs for 96h

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 The 2013 Fall HFE]: 34,100 cfs for 96h

==2012==
*Publication of the High Flow Experiment Protocol
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 The 2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study 2009-2011 Fall Steady Flow Experiment]
*The 2011 Equalization flows
*Start of a Biennial Budget and Workplan
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study 2009-2011 Fall Steady Flow Experiment]

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study 2009-2011 Fall Steady Flow Experiment]

==2008==
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs The 2008 Spring HFE]

==2007==
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]

==2006==
*Long-Term Experimental Plan Environmental Plan (LTEP)

==2005==

==2004==
*[https://pubs.usgs.gov/fs/2011/3012/ The 2004 Fall HFE]
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]

==2003==
*Experiment begun to remove nonnative trout from the Colorado River in Grand Canyon.
*Fluctuating nonnative fish suppression releases from January through March implemented and continued through 2005.

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 yr of an experimental design proposed by the GCMRC.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish in 2001.
*Draft ''Strategic Plan for the GCDAMP'' developed by program managers.

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The 2000 Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP

==1998==

==1997==
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*[[The 1997 Habitat Maintenance Flow (HMF)]]
*Strategic Planning Subcommittee (1997-2000)
*AMWG and TWG fully established

==1996==
*[[The 1996 Spring HFE| The 1996 Beach/Habitat-Building Flow (BHBF)]]
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement to comply with consultation requirements of the Grand Canyon Protection Act of 1992. (Signed by Secretary of the Interior Bruce Babbitt)

==1995==
*Establishment of the Grand Canyon Monitoring and Research Center
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]

==1993==

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act of 1992] passed

==1991==
*The 1990-91 Experimental Flows
*Interim operating criteria for Glen Canyon Dam implemented.
*Razorback Sucker and Kanab Ambersnail federally listed as endangered.

==1990==
*The 1990-91 Experimental Flows
*Beginning of Interim Operating Criteria

==1989==
*Secretary of the Interior Lujan orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem

==1988==
*Salt Lake City Area Integrated Projects(CRSP)passed-1989 after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1986==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983-86 Floods]

==1985==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983-86 Floods]

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983-86 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983-86 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1975==
*Grand Canyon National Park Enlargement Act passed

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1972==
*Last verified record of Colorado Pikeminnow caught in Grand Canyon at Havasu Creek

==1971==

==1970==
*Long-range Operating Criteria developed for Glen Canyon Dam operations

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1968==
*Colorado River Basin Project Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1966==
*National Historic Preservation Act passed

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1963==
*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Cort held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1935 ==
*Hoover Dam completed

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” (July 25th)]

== 1919 ==
*Grand Canyon National Park created

== 1916 ==
*National Park Service Organic Act passed

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1869 ==
*Major John Wesley Powell leads first recored expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

==*11,000 BP==
*Paleo-Indian peoples occupy Grand Canyon region

GCDAMP History Time-Line -Years

2026-09-28T22:43:33Z

Cellsworth:

__NOTOC__
*11,000 BP Paleo-Indian peoples occupy Grand Canyon region

== 1869 ==
*Major John Wesley Powell leads first recored expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1916 ==
*National Park Service Organic Act passed

== 1919 ==
*Grand Canyon National Park created

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” (July 25th)]

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1935 ==
*Hoover Dam completed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

==1963==

*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Cort held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1966==
*National Historic Preservation Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1968==
*Colorado River Basin Project Act passed

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1970==
*Long-range Operating Criteria developed for Glen Canyon Dam operations

==1971==

==1972==
*Last verified record of Colorado Pikeminnow caught in Grand Canyon at Havasu Creek

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.

==1975==
*Grand Canyon National Park Enlargement Act passed

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1982==
*Glen Canyon Environmental Studies - Phase I (1982-1988) created to study effects of Glen Canyon Dam operations

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983-86 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983-86 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1985==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983-86 Floods]

==1986==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983-86 Floods]

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1988==
*Salt Lake City Area Integrated Projects(CRSP)passed-1989 after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II (1988-1988), which would be accelerated to support environmental impact statement process.

==1989==
*Secretary of the Interior Lujan orders an environmental impact statement on dam operations.
*National Research Council sponsors [https://www.nationalacademies.org/publications/1832 symposium] that reviews existing knowledge on Colorado River ecosystem

==1990==
*The 1990-91 Experimental Flows
*Beginning of Interim Operating Criteria

==1991==
*The 1990-91 Experimental Flows
*Interim operating criteria for Glen Canyon Dam implemented.
*Razorback Sucker and Kanab Ambersnail federally listed as endangered.

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act of 1992] passed

==1993==

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]

==1995==
*Establishment of the Grand Canyon Monitoring and Research Center
*Transition Work Group to act as a bridge between GCES and GCDAMP (1995-1996)

==1996==
*[[The 1996 Spring HFE| The 1996 Beach/Habitat-Building Flow (BHBF)]]
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement to comply with consultation requirements of the Grand Canyon Protection Act of 1992. (Signed by Secretary of the Interior Bruce Babbitt)

==1997==
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*[[The 1997 Habitat Maintenance Flow (HMF)]]
*Strategic Planning Subcommittee (1997-2000)
*AMWG and TWG fully established

==1998==

==1999==
*AMWG Colorado River trip to develop the Vision Statement for the GCDAMP

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The 2000 Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish in 2001.
*Draft ''Strategic Plan for the GCDAMP'' developed by program managers.

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 yr of an experimental design proposed by the GCMRC.

==2003==
*Experiment begun to remove nonnative trout from the Colorado River in Grand Canyon.
*Fluctuating nonnative fish suppression releases from January through March implemented and continued through 2005.

==2004==
*[https://pubs.usgs.gov/fs/2011/3012/ The 2004 Fall HFE]
*[https://gcdamp.com/index.php/GCDAMP_Budget#:~:text=2004%20GCDAMP%20Goals%20and%20AMWG%20Priority%20Questions GCDAMP Goals and AMWG Priority Questions]

==2005==

==2006==
*Long-Term Experimental Plan Environmental Plan (LTEP)

==2007==
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]
*[https://gcdamp.com/index.php/Strategic_Science_Plan Strategic Science Plan]

==2008==
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs The 2008 Spring HFE]

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study 2009-2011 Fall Steady Flow Experiment]

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study 2009-2011 Fall Steady Flow Experiment]

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study 2009-2011 Fall Steady Flow Experiment]
*The 2011 Equalization flows
*Start of a Biennial Budget and Workplan
*[https://gcdamp.com/index.php/Core_Monitoring_Plan Core Monitoring Plan (draft)]

==2012==
*Publication of the High Flow Experiment Protocol
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 The 2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 The 2013 Fall HFE]: 34,100 cfs for 96h

==2014==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 The 2014 Fall HFE]: 37,500 cfs for 96h

==2015==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*Start of a Triennial Budget and Workplan

==2016==
*Publication of the LTEMP EIS
*[https://pubs.usgs.gov/of/2017/1006/ofr20171006.pdf LTEMP Science Plan]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-10-18-twg-meeting/Attach_09b.pdf TWG Protocol Paper]

==2017==

==2018==
*[[The 2018 Fall HFE]]: 38,100 cfs for 60h

==2019==

==2020==
*COVID moves all meetings for the year to remote

==2021==
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow The 2021 Spring Disturbance Flow]

==2022==
*[[A 2022 Fall HFE| A 2022 Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)

==2023==
*[[The 2023 Spring HFE| The 2023 Spring HFE: 39,500 cfs for 72h]]

==2024==
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2025==
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2026==
Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]

==2027==

GCDAMP History Time-Line -Years

2026-09-28T22:28:32Z

Cellsworth:

__NOTOC__
*11,000 BP Paleo-Indian peoples occupy Grand Canyon region

== 1869 ==
*Major John Wesley Powell leads first recored expedition to traverse Grand Canyon
*[http://www.azcentral.com/story/travel/local/history/2014/05/27/powells-death-defying-grand-canyon-odyssey/9596303/ Powell's death-defying Grand Canyon odyssey]

== 1902 ==
*Reclamation Act Creates the Bureau of Reclamation

== 1916 ==
*National Park Service Organic Act passed

== 1919 ==
*Grand Canyon National Park created

== 1921 ==
*[http://www.parkerliveonline.com/2013/07/24/colorado-river-day-thursday/ Colorado River was officially re-named from the “Grand” to the “Colorado.” (July 25th)]

== 1922 ==
*Colorado River Compact signed allocating the Colorado River water between the upper and the lower basins. Upper basin States have the right to use 7.5 maf/yr only if that quantity is available after meeting delivery requirements of 7.5 maf/yr to the Lower basin plus the amount required to satisfy anticipated claims by Mexico.

== 1928 ==
*Boulder Canyon Project Act passed authorizing Hoover Dam.

== 1935 ==
*Hoover Dam completed

== 1944 ==
*Treaty with Mexico obligating the US to provide 1.5 maf of Colorado River water to Mexico annually

== 1948 ==
*Upper Colorado River Basin Compact signed

== 1956 ==
*Colorado River Storage Project Act passed authorizing Glen Canyon Dam

==1963==

*Glen Canyon Dam completed as part of the Colorado River Storage Project.
*U.S. Supreme Cort held in Arizona vs California that, as a result of the Boulder Canyon Project Act, California held an allocation of 4.4 maf, Arizona 2.8 maf, and Nevada 300,000 acre-feet of Colorado River water

==1964==
*U.S. Supreme Court decision in Arizona v. California confirmed apportionments of Colorado River water authorized in 1928 Boulder Canyon Project Act, including Nevada's allocation of 0.3 maf per year. The Decree in this case set many of the rules under which the river is operated.

==1965==
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]
*United States contract for delivery of power from the Colorado River Storage Project to customers.

==1966==
*National Historic Preservation Act passed

==1967==
*Humpback chub and Colorado pikeminnow federally listed as endangered

==1968==
*Colorado River Basin Project Act passed

==1969==
*National Environmental Policy Act (NEPA) of 1969 passed requiring Federal agencies to consider the environmental impacts of their proposed actions and reasonable alternatives to those actions.

==1970==
*Long-range Operating Criteria developed for Glen Canyon Dam operations

==1971==

==1972==
*Last verified record of Colorado Pikeminnow caught in Grand Canyon at Havasu Creek

==1973==
*Endangered Species Act (ESA) of 1973 passed to protect and promote the recovery of animals and plants that are in danger of becoming extinct because of the activities of people. Administered by the US Fish and Wildlife Service.

==1974==
*Colorado River Basin Salinity Control Act authorized the construction, operation, and maintenance of works in the Colorado River Basin to control the salinity of Colorado River water available for use in the United States and Mexico. Some GCDAMP stakeholders participate in the Salinity Control Forums created by the act.
*First Lawsuit filed over Glen Canyon Dam operations by commercial raft operators contending that the disruption of normal flows was interfering with their ability to conduct river trips.
==1975==
Grand Canyon National Park Enlargement Act passed

==1978==
*U.S. Fish and Wildlife Service files jeopardy opinion on the effects of Glen Canyon Dam on endangered fishes

==1979==
*Grand Canyon National Park designated a UNESCO World Heritage Site
*USBR proposes an upgrade of Glen Canyon Dam's generators

==1980==
*Lake Powell reaches full pool (3,700 ft)
*Bonytail chub listed as endangered

==1982==
*Glen Canyon Environmental Studies created to study effects of Glen Canyon Dam operations

==1983==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983-86 Floods]
*Glen Canyon Dam releases more than 92,000 cfs to stop Lake Powell from overtopping Glen Canyon Dam.

==1984==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983-86 Floods]
*One of the last Razorback Suckers seen in Grand Canyon is caught and released at Bass Rapids

==1985==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983-86 Floods]

==1986==
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983-86 Floods]

==1987==
*National Research Council completes review of Glen Canyon Environmental Studies, publishing [http://archive.org/details/riverdammanageme00unse River and Dam Management: a Review of the Bureau of Reclamation's Glen Canyon Environmental Studies]

==1988==
*Salt Lake City Area Integrated Projects(CRSP)passed-1989 after a series of public information and comment forums.
*Glen Canyon Environmental Studies issues [http://archive.library.nau.edu/utils/getfile/collection/cpa/id/61166/filename/61167.pdf ''Glen Canyon Environmental Studies Final Report''], completing Phase I and starting Phase II, which would be accelerated to support environmental impact statement process.

==1989==
*Secretary of the Interior Lujan orders an environmental impact statement on dam operations.
*National Research Council sponsors symposium that reviews existing knowledge on Colorado River ecosystem

==1990==
*The 1990-91 Experimental Flows

==1991==
*The 1990-91 Experimental Flows
*Interim operating criteria for Glen Canyon Dam implemented.
*Razorback Sucker and Kanab Ambersnail federally listed as endangered.

==1992==
*[http://www.usbr.gov/uc/legal/gcpa1992.html Grand Canyon Protection Act of 1992] passed

==1993==

==1994==
*Programmatic Agreement on Cultural Resources signed between the State of Arizona, Department of the Interior agencies, and six tribes over protection of cultural resources in the river corridor below Glen Canyon Dam.
*U.S. Fish and Wildlife Service designates critical habitat for four species of endangered Colorado River fish and completes Biological Opinion outlining reasonable and prudent alternatives that must be evaluated for dam operation.
*Memorandum of Agreement signed for development of a Lower Colorado River Multi-Species Conservation Plan between state agencies in Nevada, California, and Arizona and federal agencies, including the Bureau of Land Management, Bureau of Reclamation, Fish and Wildlife Service, and the National Park Service.[http://www.sci.sdsu.edu/salton/LowerColoradoRiverMSCP.html MSCP History (SDSU)]

==1995==

==1996==
*[[The 1996 Spring HFE| The 1996 Beach/Habitat-Building Flow (BHBF)]]
*Record of Decision on the Operation of Glen Canyon Dam Final Environmental Impact Statement to comply with consultation requirements of the Grand Canyon Protection Act of 1992. (Signed by Secretary of the Interior Bruce Babbitt)

==1997==
*The AMWG held their first meeting on September 10-11, 1997, and officially formed the Glen Canyon Technical Work Group (TWG) as a subgroup to work on tasks charged to them by the AMWG.
*The TWG was formed to provide stakeholders with involvement in federal decisions concerning the operation of Glen Canyon Dam and Power Plant.
*[[The 1997 Habitat Maintenance Flow (HMF)]]

==1998==

==1999==

==2000==
*[[The 2000 Low Summer Steady Flow Experiment| The 2000 Low Steady Summer Flow Experiment (LSSF)]]
*Second and third tests of the habitat maintenance flows concept conducted in spring and summer.

==2001==
*Humpback Chub population in Grand Canyon was in decline in the 1990s, and reached a low of about 5,000 adult fish in 2001.
*Draft ''Strategic Plan for the GCDAMP'' developed by program managers.

==2002==
*U.S. Fish and Wildlife Service announces recovery goals for endangered fishes of the Colorado River Basin.
*Adaptive Management Work Group recommends implementation of the first 2 yr of an experimental design proposed by the GCMRC.

==2003==
*Experiment begun to remove nonnative fish from the Colorado River in Grand Canyon.
*Fluctuating nonnative fish suppression releases from January through March implemented and continued through 2005.

==2004==
*[https://pubs.usgs.gov/fs/2011/3012/ The 2004 Fall HFE]

==2005==

==2006==

==2007==
*[https://gcdamp.com/index.php/Interim_Guidelines Beginning of Interim Guidelines for Lower Basin Shortages (2007-2027)]

==2008==
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs The 2008 Spring HFE]

==2009==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study 2009-2011 Fall Steady Flow Experiment]

==2010==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study 2009-2011 Fall Steady Flow Experiment]

==2011==
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study 2009-2011 Fall Steady Flow Experiment]
*The 2011 Equalization flows

==2012==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 The 2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*Razorback Sucker found in lower part of Grand Canyon- believed the fish traveled some 50 miles upstream from Lake Mead. Last one recorded had been caught in 1990.

==2013==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 The 2013 Fall HFE]: 34,100 cfs for 96h

==2014==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 The 2014 Fall HFE]: 37,500 cfs for 96h

==2015==
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)

==2016==

==2017==

==2018==
*[[The 2018 Fall HFE]]: 38,100 cfs for 60h

==2019==

==2020==

==2021==
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow The 2021 Spring Disturbance Flow]

==2022==
*[[A 2022 Fall HFE| A 2022 Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)

==2023==
*[[The 2023 Spring HFE| The 2023 Spring HFE: 39,500 cfs for 72h]]

==2024==
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2025==
*[https://gcdamp.com/index.php/SEIS_Bypass_Releases SEIS Bypass Releases] (CoolMix) to control smallmouth bass

==2026==
Start of [https://gcdamp.com/index.php/2027-2028_Operating_Guidelines 2027-2028 Operating Guidelines]

==2027==

The HFE Page

2026-09-28T22:24:20Z

Cellsworth:

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[[File:Glen Canyon Dam spill.gif|center|380px]]<br>

[[File:BeachErosion.JPG|center|380px]]


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=='''High-Flow Experimental (HFE) Releases'''==

===Purpose and Goal===
The purpose of HFEs is to determine if sandbar building during HFEs exceeds sandbar erosion during periods between HFEs, such that sandbar size can be increased or maintained over several years.

===LTEMP HFE Protocol===
As described in the LTEMP ROD, HFEs are experimental in nature and are designed to achieve a better understanding of whether, how, and when to incorporate high releases into future dam operations in a manner that maintains or improves beaches, sandbars, and associated habitat. The LTEMP HFE Protocol establishes a decision-making framework consisting of three components: (1) planning and budgeting, (2) modeling, and (3) decision and implementation.

Under the LTEMP, HFE releases are restricted to limited periods of the year when the highest volumes of sediment are most likely available for building sandbars. Sediment-triggered HFEs may be made in spring (March to June) or fall (October to November; Figure 1). Fall extended-duration HFEs range from greater than 96 hr to 250 hr. Spring and fall HFEs that are not extended-duration range from less than 1 hr to 96 hr. Proactive HFEs may be implemented in spring or early summer (April, May or June), and have a duration range up to 24 hr. HFE magnitudes range from 31,500 cubic feet per second (cfs) to 45,000 cfs. The frequency of HFEs is determined by tributary sediment inputs, annual release volumes, resource conditions, and decisions of the Department. Extended-duration fall HFEs are limited to a frequency of 4 times total in the 20-year LTEMP period.

===HFE Sand Budget Model===
The LTEMP HFE Protocol uses predictive models to make recommendations for the magnitude and duration of potential HFEs using real-time measurements and models of sand inflow from the Paria River and forecasted hydrologic data to determine whether suitable sediment and hydrology conditions exist for a high-flow experimental release.

A sand transport/budget model (Wright et al. 2010) is used to predict the mass of sand that would be transported by an HFE and to estimate if a proposed HFE would transport more or less sand than had been delivered from the Paria River to the Colorado River during the sediment accounting period (July 1 to June 30). Only HFE durations that result in a “positive sand balance” are considered. Output of the modeling runs provides the initial recommendation for the magnitude and duration of the HFE. However, because modeling only considers a simple range of possible HFE peak magnitudes and durations, the Protocol includes a review of the model output that may modify the recommended HFE to benefit relevant resources. (2018 HFE Tech Team Report)

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{|width="100%" cellpadding="2" cellspacing="5" style="vertical-align:top; background:#f5faff;"
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; text-align:left; color:#000; padding:0.2em 0.4em;"> [https://gcdamp.com/index.php/Long-term_Experimental_and_Management_Plan_(LTEMP) 2024 LTEMP SEIS] </h2>
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The [https://gcdamp.com/images_gcdamp_com/d/db/20240500-GCDLTEMP-FinalSEIS-508-AMWD_%282%29.pdf 2024 LTEMP SEIS] adjusted the semiannual sediment accounting period to an annual period (beginning July 1) with the option for a spring or fall HFE release, or both. If a sediment trigger is met, but an HFE release is not implemented in the fall or spring, rollover of sediment into the next accounting period is possible. Implementation of a fall HFE can occur in October or November. Spring implementation could occur from March through June, depending on resource conditions and the potential for implementation of the 2024 LTEMP SEIS cold-water alternatives that include flow spikes. [https://www.usbr.gov/uc/DocLibrary/EnvironmentalImpactStatements/GlenCanyonDamLong-TermExperimentalManagementPlan/20240703-GCDLTEMP-FinalSEIS-RecordofDecision-508-AMWD.pdf]

[[File:New_HFE_windows_cumulative.png|center|600px]]<br>

[[File:New_HFE_windows_monthly.png|center|600px]]<br>

|-
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;"> LTEMP Experimental Action: Sediment-Related Experimental Treatments (Table 2-2, pages 11-12) [https://ltempeis.anl.gov/documents/final-eis/vol1/Chapter_2-Alternatives.pdf] </h2>
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Under Alternative D, the existing HFE protocol was updated and incorporated into the LTEMP process as specified in Appendix P of the FEIS. Changes to the existing protocol were related to implementation of the new HFEs that are included under Alternative D and an B-17 extension of the protocol to the end of the LTEMP period. This new protocol will replace the existing protocol when the LTEMP ROD is issued. Spring and fall HFEs will be implemented when triggered during the 20-year LTEMP period based on the estimated sand mass balance resulting from Paria River sediment inputs during the spring and fall accounting periods, and the dam release pattern during the accounting period. HFE releases will be 1 to 250 hr long and between 31,500 cfs and 45,000 cfs. Depending on the cumulative amount of sediment input from the Paria River during the spring (December 1 through June 30) or fall (July 1 through November 30) accounting periods and the expected accumulation of sand, the maximum possible magnitude and duration of HFE that would achieve a positive sand mass balance in Marble Canyon, as determined by modeling, will be implemented.

Sand mass balance modeling will be used to ensure that the duration and magnitude of an HFE are best matched with the mass of sand present in the system during a particular release window. The magnitude and duration of HFEs will not affect the total annual release from Glen Canyon Dam. Reclamation will consider the total water to be released in the water year when determining the magnitude and duration of an HFE. [https://ltempeis.anl.gov/documents/docs/LTEMP_ROD.pdf]

'''Sediment-Triggered Spring HFEs'''
*HFE window: Mar-Apr
*Up to 96 hrs
*Could begin after the first two years of LTEMP (start spring 2020),
*Not in the same water year as an extended-duration (>96 hr) fall HFE

'''Proactive Spring HFEs'''
*Triggered by an annual release volume over 10.0 maf
*HFE window: Apr-Jun
*Up to 24 hrs
*Not in the same water year as a sediment-triggered spring HFE or an extended-duration (>96 hr) fall HFE

'''Sediment-Triggered Fall HFEs'''
*HFE window: Oct-Nov
*Up to 96 hrs

'''Extended-Duration Fall HFEs'''
*HFE window: Oct-Nov
*Up to 250 hrs
*The first test would be limited to 192 hrs
*No more than four during the 20-year LTEMP period

[[File:HFE types.JPG|center|700px]]

[[File:HFE decision tree.jpg|center|500px]]

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">The Planning and Implementation (P&I) Process</h2>
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1.4 COMMUNICATION AND CONSULTATION PROCESS FOR ALTERNATIVE D

To determine whether conditions are suitable for implementing or discontinuing experimental treatments or management actions, the DOI will schedule implementation/planning meetings or calls with the DOI bureaus (USGS, NPS, FWS, BIA, and Reclamation), WAPA, AZGFD, and one liaison from each Basin State and from the UCRC, as needed or requested by the participants. The implementation/planning group will strive to develop a consensus recommendation to bring forth to the DOI regarding resource issues as detailed at the beginning of this section, as well as including WAPA’s assessment of the status of the Basin Fund. The Secretary of the Interior will consider the consensus recommendations of the implementation/planning group, but retains sole discretion to decide how best to accomplish operations and experiments in any given year pursuant to the ROD and other binding obligations. (B-17 in the LTEMP ROD)

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Updates</h2>
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[[File:SandbarVolume2018.jpg|center|thumbnail|500px| Sandbar volume 1990-2018]]

[[File:PostHFEerosion.jpg|center|thumbnail|500px|Rate of post-HFE beach erosion]]

[[File:HFE_size_shape.jpg|center|thumbnail|500px|[https://www.usbr.gov/uc/progact/amp/twg/2017-01-26-twg-meeting/AR3_Grams.pdf https://www.usbr.gov/uc/progact/amp/twg/2017-01-26-twg-meeting/AR3_Grams.pdf]]]

[[File:SandbarMonitoring2016.jpg|thumbnail|center|500px|[https://www.usbr.gov/uc/progact/amp/twg/2017-01-26-twg-meeting/AR3_Grams.pdf https://www.usbr.gov/uc/progact/amp/twg/2017-01-26-twg-meeting/AR3_Grams.pdf]]]

[[File:2012 2014 HFE response.jpg|thumbnail|center|500px|[https://www.usbr.gov/uc/progact/amp/twg/2015-06-11-twg-meeting/Attach_02,.pdf https://www.usbr.gov/uc/progact/amp/twg/2015-06-11-twg-meeting/Attach_02,.pdf]]]

[[File:2016 SedimentSummary.jpg|thumbnail|center|500px|[https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/AR02_Grams.pdf https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/AR02_Grams.pdf]]]

[[File:GCDFlowRecord.jpg|center|px500]]

[[File:GCDExperimentalFlows.jpg|center|px500]]

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Links and Information</h2>
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|style="color:#000;"|
*[http://www.usbr.gov/uc/rm/gcdHFE/ USBR HFE Page]
*[https://www.usgs.gov/centers/sbsc/science/high-flow-experiments-colorado-river?qt-science_center_objects=0#qt-science_center_objects GCMRC HFE Page]
*[[GCDAMP Sediment| The Sediment Page]]
*[https://www.usbr.gov/uc/progact/amp/amwg/2023-08-17-amwg-meeting/20230817-ProposalAmendHigh-FlowExperimentProtocolOtherConsiderations-508-UCRO.pdf 2023 Proposal to Amend the High-Flow Experiment Protocol and Other Considerations ]
*[http://www.usbr.gov/uc/envdocs/ea/gc/HFEProtocol/ Environmental Assessment for the Development and Implementation of a Protocol for High-flow Experimental Releases from Glen Canyon Dam, Arizona, 2011 - 2020]
*[https://www.usbr.gov/uc/DocLibrary/Memos/20240326-EstablishmentInterimOperatingGuidanceGlenCanyonDamLowReservoirLevels-TechnicalDecisionMemo-508-TSC.pdf Technical Decision Memo: Establishment of Interim Operating Guidance for Glen Canyon Dam during Low Reservoir Levels at Lake Powell ]
*Fall HFEs may be connected to the recent increase in [http://gcdamp.com/index.php?title=Brown_Trout brown trout] at Lees Ferry.
*Spring HFEs increase productivity of the [http://gcdamp.com/index.php?title=FOOD_BASE aquatic foodbase]. Fall HFEs do not appear to affect the long-term composition of the [http://gcdamp.com/index.php?title=FOOD_BASE aquatic foodbase] and may scour the foodbase prior to the winter non-growing season.
*HFEs do not appear to directly affect [http://gcdamp.com/index.php?title=Humpback_Chub_Page humpback chub] or the [http://gcdamp.com/index.php?title=FISHERY rainbow trout fishery] but there may be indirect affects tied to foodbase and trout production.
*[[GCDAMP Rapid Response Learning Page| Rapid Response HFE Page]]

|-
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Glen Canyon Dam Flow Experiments</h2>
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|style="color:#000;"|
*[[A 2026 Spring HFE]] was not conducted because the mixed support expressed by the PI Leadership Team
*[[A 2025 Fall HFE]] was not conducted because of the government shutdown
*[[A 2025 Spring HFE]] was not conducted because of timing conflicts with the renovation of the -12 Mile Slough
*[[A 2024 Fall HFE]] was "deferred" for possible implementation in the Spring of 2025
*A 2023 Fall HFE was not conducted for lack of sediment
*[[The 2023 Spring HFE| The 2023 Spring HFE: 39,500 cfs for 72h]]
*[[A 2022 Fall HFE| A 2022 Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt)
*[[A 2022 Spring HFE| A 2022 Spring HFE]] was not conducted for lack of sediment
*[[A 2021 Fall HFE| A 2021 Fall HFE]] was not conducted due to low reservoir elevations (1,492,000 mt)
*[[A 2021 Spring HFE| A 2021 Spring HFE]] was not conducted for lack of sediment
*[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow The 2021 Spring Disturbance Flow]
*[[The 2020 Fall HFE| A 2020 Fall HFE]] was not conducted for lack of sediment
*[[The 2020 Spring HFE| A 2020 Spring HFE]] was not conducted for lack of sediment
*[[The 2019 Fall HFE| A 2019 Fall HFE]] was not conducted for lack of sediment
*[[The 2018 Fall HFE]]: 38,100 cfs for 60h
*[[The 2017 Fall HFE| A 2017 Fall HFE]] was not conducted for lack of sediment
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon (1,168,000 mt)
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 The 2014 Fall HFE]: 37,500 cfs for 96h
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 The 2013 Fall HFE]: 34,100 cfs for 96h
*[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 The 2012 Fall HFE]: 42,300 cfs for 96h (slow downramp)
*The 2011 Equalization flows
*[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study The 2009-11 Fall Steady Flow Experiment]
*[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs The 2008 Spring HFE]
*[https://pubs.usgs.gov/fs/2011/3012/ The 2004 Fall HFE]
*[[The 2000 Low Summer Steady Flow Experiment| The 2000 Low Steady Summer Flow Experiment (LSSF)]]
*[[The 1997 Habitat Maintenance Flow (HMF)]]
*[[The 1996 Spring HFE| The 1996 Beach/Habitat-Building Flow (BHBF)]]
*The 1990-91 Experimental Flows
*[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983-86 Floods]
*[[The 1965 Reservoir Equalization and Channel Cleaning Floods]]

|-
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Presentations and Papers </h2>
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'''2026'''
*[https://www.usbr.gov/uc/progact/amp/twg/2026-02-05-twg-meeting/uc-gcdamp-arm-riverbed-sandbarresponse-508-20260205.pdf Riverbed and Sandbar Response to Glen Canyon Dam Operations and High-Flow Experiments]

'''2025'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2025-08-21-amwg-meeting/uc-gcdamp-amwg-ltempupdate-508-20250821.pdf LTEMP Experiments Update]
*[https://www.usbr.gov/uc/progact/amp/twg/2025-04-10-twg-meeting/uc-gcdamp-twg-ltempflowexperiments-508-20250410.pdf LTEMP Flow Experiments]

'''2024'''
*[https://pubs.usgs.gov/publication/70259444 Grams et al., 2025, Implementation of Controlled Floods for Sediment Management on the Colorado River in Grand Canyon Under Aridification]
*[[Media:Grams_etal_2024_Implementation_Controlled_Floods_for_Sediment_Management_ColRiv.pdf|Grams et al., 2024, Implementation of controlled floods for sediment management on the Colorado River in Grand Canyon under aridification: River Research and Applications]]

'''2023'''
*[https://www.usbr.gov/uc/progact/amp/twg/2023-11-08-twg-meeting/20231108-HFEProtocolFall2023-508-UCRO.pdf HFE Protocol for Fall 2023]
*[https://www.usbr.gov/uc/progact/amp/amwg/2023-08-17-amwg-meeting/20230817-TWGHFEProtocolMotion-508-UCRO.pdf TWG HFE Protocol Motion]
*[https://www.usbr.gov/uc/progact/amp/amwg/2023-08-17-amwg-meeting/20230817-April2023High-FlowExperimentPreliminaryResults-508-UCRO.pdf April 2023 High-Flow Experiment (HFE) Preliminary Results]
*[https://www.usbr.gov/uc/progact/amp/amwg/2023-08-17-amwg-meeting/20230817-BackgroundInformationProposalAmendHigh-FlowExperimentProtocol-508-UCRO.pdf Background Information for "Proposal to Amend the High-Flow Experiment (HFE) Protocol"]
*[https://www.usbr.gov/uc/progact/amp/amwg/2023-08-17-amwg-meeting/20230817-PreliminaryFieldReportAprilHigh-FlowExperiment-508-UCRO.pdf Preliminary Field Report from the April High-Flow Experiment]
*[https://www.usbr.gov/uc/progact/amp/amwg/2023-08-17-amwg-meeting/20230817-ProposalAmendHigh-FlowExperimentProtocolOtherConsiderations-508-UCRO.pdf Proposal to Amend the High-Flow Experiment Protocol and Other Considerations]
*[https://www.usbr.gov/uc/progact/amp/amwg/2023-08-17-amwg-meeting/20230817-ProposalAmendHigh-FlowExperimentProtocolOtherConsiderations-508-UCRO.pdf Proposal to Amend the High-Flow Experiment Protocol and Other Considerations]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-06-15-twg-meeting/20230615-April2023HighFlowExperimentPreliminarySandbarResults-508-UCRO.pdf April 2023 High-Flow Experiment Preliminary Sandbar Results]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-06-15-twg-meeting/20230615-PreliminaryFieldReportsAprilHighFlowExperiment-508-UCRO.pdf Preliminary Field Reports from the April High-Flow Experiment ]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-04-13-twg-meeting/20230413-ChargeCreateProcessAmendHFEProtocol-508-UCRO.pdf Charge to create a process to amend the HFE protocol]
*[https://www.usbr.gov/uc/progact/amp/amwg/2023-02-16-amwg-meeting/20230216-OverviewProjectsABLEvaluationHigh-FlowExperimentsDuringAridification-508-UCRO.pdf Overview of Projects A, B, and L and Evaluation of High-Flow Experiments During Aridification]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-01-26-twg-meeting/20230126-AnnualReportingMeeting-OverviewEvaluationHigh-FlowExperimentsDuringAridification-508-UCRO.pdf Project B Overview and Evaluation of High-Flow Experiments During Aridification]

'''2022'''
*[[Media:Grams_HFE_discussion_20220901.pdf| Evaluation of High-Flow Experiments under conditions of low flows and low reservoir elevations]]
*[https://www.usbr.gov/uc/progact/amp/twg/2022-01-13-twg-meeting/20220113-AnnualReportingMeeting-EffectsHigh-flowExperimentsDamReleasesSandbarErosionDepositionMarbleGrandCanyons-508-UCRO.pdf The Effects of High-flow Experiments and Dam Releases on Sandbar Erosion and Deposition in Marble and Grand Canyons ]

'''2021'''
*[[Media:Grams 2021 Geomorphic.pdf| Mueller and Grams, 2021, A morphodynamic model to evaluate long‐term sandbar rebuilding using controlled floods in the Grand Canyon: Geophysical Research Letters]]

'''2020'''
*[https://www.usbr.gov/uc/progact/amp/twg/2020-06-24-twg-meeting/20200624-High-FlowExperimentsSedimentModeling-508-UCRO.pdf HFE Sediment Modeling ]
*[https://www.usbr.gov/uc/progact/amp/twg/2020-06-24-twg-meeting/20200624-CarlisleEcoSigDimSpringFreshets.pdf Ecological Significance of Diminished Spring Freshets ]
*[https://www.usbr.gov/uc/progact/amp/twg/2020-06-24-twg-meeting/20200624-Grams-TWG.pdf Evaluating the Frequency of Triggered Spring High Flow Experiments Assumed in the LTEMP ]
*[https://www.usbr.gov/uc/progact/amp/twg/2020-01-13-twg-meeting/20200113-AnnualReportingMeeting-PotentialSpringHighFlowExperiment%E2%80%93StatusResourcesExperimentalPlan-Presentation-508-UCRO.pdf Potential Spring High Flow Experiment – Status of Resources and Experimental Plan ]

'''2019'''
*[https://www.usbr.gov/uc/progact/amp/twg/2019-03-14-twg-meeting/20190314-WhatsNextKeyUncertaintiesFutureHFEDesign-Presentation-508-UCRO.pdf What’s Next? Key Uncertainties and Future HFE Design Presentation ]
*[https://www.usbr.gov/uc/progact/amp/twg/2019-03-14-twg-meeting/20190314-TheEffectsHigh-flowExperimentsSandbarDynamics-Presentation-508-UCRO.pdf The Effects of High-flow Experiments on Sandbar Dynamics Presentation ]

'''2018'''
*[https://qcnr.usu.edu/wats/colorado_river_studies/files/documents/Grams.pdf Geomorphic Changes to the River Channels and Flood Plains of the Colorado River System: The Planned and Unplanned Effects of Water Development]
*[https://www.usbr.gov/uc/progact/amp/amwg/2018-08-22-amwg-meeting/Attach_07.pdf High Flow Experiments PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-06-25-twg-meeting/Attach_14.pdf Discussion about the High Flow Experimental Design PPT]
*[[Media:GCWC LTEMP Springtime HFE Comments Feb 24 2016.pdf| GCWC LTEMP comments on springtime HFEs]]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-04-23-twg-meeting/Attach_12.pdf Evaluating the Frequency of Triggered Spring High Flow Experiments (HFEs) Assumed in the Long-Term Experimental and Management Plan PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2018-02-14-amwg-meeting/Attach_12b.pdf Considerations for Seasonal Scheduling of High Flow Experiments PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-01-25-twg-meeting/AR12.pdf Effects of HFEs on Growth and Population Dynamics of Rainbow Trout in Glen Canyon and Mable Canyon PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-01-25-twg-meeting/AR03.pdf Sandbars and Sediment Storage Marble and Grand Canyons: Response to Recent High-flow Experiments and Long-term Trends PPT]
*[https://doi.org/10.1016/j.sedgeo.2017.11.007 Mueller et al., 2018, Variability in eddy sandbar dynamics during two decades of controlled flooding of the Colorado River in Grand Canyon: Sedimentary Geology, v. 363, p. 181-199]

'''2017'''
*[https://www.usbr.gov/uc/progact/amp/twg/2017-01-26-twg-meeting/AR3_Grams.pdf Sandbars and Sediment Storage in Marble and Grand Canyons: Response to Recent High-flow Experiments and Long-term Trends PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2017-01-26-twg-meeting/AR15_Korman.pdf Boom-and-Bust Cycles in the Population of Rainbow Trout in Glen Canyon and Effect of Fall High Flow Experiments PPT]

'''2016'''
*[[Media:Hi Flow Beaches 2016.pdf| The Grand Canyon Private Boater’s Association’s (GCPBA) comments regarding the recently concluded High Flow Experiment releases]]
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-08-24-amwg-meeting/Attach_11c.pdf Science Behind High Flow Experiment Planning: From Chasing Storms in the Paria River to Serving Data on the Web]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/Attach_04a.pdf Sand Trigger for High-flow Experimental Protocol]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/Attach_04b.pdf Introduction of a Motion to TWG Regarding Clarification of the High Flows Protocol for Springtime HFEs: Draft for SCAHG Consideration and Review]

'''2014'''
*[https://www.usbr.gov/uc/progact/amp/twg/2014-10-28-twg-meeting/Attach_13.pdf Modeling Long Term Effects of HFEs on Trout and HBC]
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-08-27-amwg-meeting/Attach_10.pdf Minute 319/Pulse Flow]
*[https://www.usbr.gov/uc/progact/amp/twg/2014-01-30-twg-meeting/Attach_02b.pdf Update on High Flow Experiments Released from Glen Canyon Dam]

'''2013'''
*[http://www.earthmagazine.org/article/releasing-flood-controversy-colorado-river Earth Magazine 2013 Releasing a flood of controversy on the Colorado River] --This article sets the basis for the HFE, provides the history of past HFEs, and discusses the issues.
*[https://www.usbr.gov/uc/progact/amp/twg/2013-11-06-twg-meeting/Attach_02b.pdf HFE Protocol Decision Process]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-08-08-amwg-meeting/Attach_09.pdf Planning for a Fall HFE]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-02-20-amwg-meeting/Attach_06a.pdf High Flow Experiment Update ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-02-20-amwg-meeting/Attach_06b.pdf USGS Information and Results from HFE]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-01-24-twg-meeting/Attach_06a.pdf Lessons Learned from the First HFE Protocol]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-01-24-twg-meeting/Attach_06b.pdf Background on HFE Releases and Assessment of Success]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-01-24-twg-meeting/14_Schmidt.pdf Background on High Flow Experimental Releases: Implementation Strategy and Assessment of Success]

'''2012'''
*[https://www.usbr.gov/uc/progact/amp/twg/2012-10-24-twg-meeting/Attach_05a.pdf General Science Plan for Monitoring and Research of a High-Flow Experimental Protocol at Glen Canyon Dam White Paper Dated Dec. 22, 2011, and PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2012-10-24-twg-meeting/Attach_05b.pdf Update on High Flow Experiment PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-08-29-amwg-meeting/Attach_01a.pdf News Release Dated May 23, 2012, Subj: Salazar Announces Improvements to Glen Canyon Dam Operations to Restore High Flows and Native Fish in Grand Canyon]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-08-29-amwg-meeting/Attach_01b.pdf Creation of DOI Leadership Team to Implement Actions Outlined in the Two Environmental Assessments]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-08-29-amwg-meeting/Attach_04b.pdf Implementation of the HFE Protocol with Emphasis on Fall 2012]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-08-29-amwg-meeting/Attach_04c.pdf High Flow Experiment Modeling Process PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Attach_11a.pdf Two Environmental Assessments Updates]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Attach_11b.pdf High-Flow Protocol Environmental Assessment PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2012-02-02-twg-meeting/Attach_02.pdf Final Biological Opinion on the Operation of Glen Canyon Dam Including High Flow Experiments and Non-Native Fish Control Memo]
*[https://www.usbr.gov/uc/progact/amp/twg/2012-02-02-twg-meeting/Attach_05c.pdf Executive Summaries from the High-Flow Experiment EA and the Non-Native Fish Control EA]

'''2011'''
*[http://pubs.usgs.gov/circ/1366/ Effects of Three High-Flow Experiments on the Colorado River Ecosystem Downstream from Glen Canyon Dam, Arizona]
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-08-24-amwg-meeting/Attach_16.pdf Report on Two Environmental Assessments (EAs): Protocol for High-Flow Experimental Releases EA and Non-native Fish Control EA and PPTs]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-06-28-twg-meeting/Attach_07.pdf Bureau of Reclamation Updates on Non-native Fish Control Environmental Assessment, High-Flow Protocol Environmental Assessment, and the Long-term Experimental and Management Plan PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-05-18-amwg-meeting/Attach_06.pdf Report on Two Experimental Flow EAs: High-Flow Experimental Releases EA and Non-native Fish Control EA and PPTs]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-03-08-twg-meeting/Attach_03.pdf Updates on USBR Environmental Documents PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-01-20-twg-meeting/Attach_03a.pdf Briefing Memo, Subject: Summary of upcoming USGS circular on the results of three high-flow experiments released from Glen Canyon Dam, Arizona]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-01-20-twg-meeting/Attach_03b.pdf Circular 1366: Effects of Three High-Flow Experiments on the Colorado River Ecosystem Downstream from Glen Canyon Dam, Arizona]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-01-20-twg-meeting/Attach_03c.pdf USGS Fact Sheet: Three Experimental High-Flow Releases from Glen Canyon Dam, Arizona--Effects on Downstream Colorado River Ecosystem]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-01-20-twg-meeting/Attach_04a.pdf Bureau of Reclamation Updates PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-01-20-twg-meeting/Attach_04b.pdf Sam's Questions: 1)Timing/Magnitude of Paria and LCR Floods?, and 2) Timing/Magnitude of Pre-Dam Colorado River Floods? PPT]

'''2010'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_13a.pdf High Flow Experimental Protocol Environmental Assessment Update]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_15b.pdf The Effects of Three Glen Canyon Dam High-Flow Experiments (HFE) on the Grand Canyon Ecosystem (HFE Synthesis)]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-02-03-amwg-meeting/Attach_05a.pdf High Flow Experiment]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-02-03-amwg-meeting/Attach_05c.pdf 2008 High-Flow Experiment at Glen Canyon Dam Benefits Colorado River Resources in Grand Canyon National Park (USGS Fact Sheet 2010-3009)]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-02-03-amwg-meeting/Attach_05d.pdf 2008 High Flow Experimental Results PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-02-03-amwg-meeting/Attach_05e.pdf Open File Report 2010-1022: Riparian Response to the March 2008 Short-Duration, High-Flow Experiment--Implications of Timing and Frequency of Flood Disturbance on Nonnative Plant Establishment Along the Colorado River Below Glen Canyon Dam (prepared by Barbara Ralston)]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-02-03-amwg-meeting/Attach_06a.pdf High Flow Experiment Protocol Development and Initiation of Public Scoping, Federal Register Notice Announcing Scoping, and Process/Schedule; ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-02-03-amwg-meeting/Attach_26.pdf Evaluating Effects of a High-Flow Event on Rainbow Trout Movement in Glen and Marble Canyons, Arizona, by Using Acoustic Telemetry and Relative Abundance Measures]
*[https://www.usbr.gov/uc/progact/amp/twg/2010-01-21-twg-meeting/Attach_02c.pdf Federal Register Notice on HFE Protocol published December 31, 2010]

'''2009'''
*[https://www.usbr.gov/uc/progact/amp/twg/2009-09-29-twg-meeting/Attach_06.pdf Grand Canyon Monitoring and Research Center Updates]
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-08-12-amwg-meeting/Attach_05a.pdf Grand Canyon Monitoring and Research Updates: Update on Reporting Schedule for the March 2008 High Flow Experimental Results and corresponding PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-08-12-amwg-meeting/Attach_05h.pdf Update on Sediment Inputs and 2008 High Flow PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-04-29-amwg-meeting/Attach_03a.pdf Grand Canyon Monitoring and Research Center (GCMRC) Update]
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-04-29-amwg-meeting/Attach_03d.pdf Water Quality and Sediment, 2008 High Flow Experiment, and Integrated Flow, Temperature, and Sediment Modeling PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2009-03-16-twg-meeting/Attach_05.pdf Grand Canyon Monitoring and Research Center updates by Program Managers]

'''2008'''
*[[Media:2008 BHBF minority report.pdf| Grand Canyon Trust Minority Report - TWG motion regarding a 2008 experimental BHBF]]

'''1997'''
*[[Media:1997_GCMRC_WaterTravelTime.pdf| The Colorado River in Grand Canyon: How Fast Does It Flow?]]

'''1996'''
*[http://pubs.usgs.gov/fs/FS-089-96/ Controlled Flooding of the Colorado River in Grand Canyon: The Rationale and Data-Collection Planned]

|-
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">2019 HFE Workshop</h2>
|-
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In lieu of the motion by Recreational Fishing representatives proposed for this meeting, GCMRC has agreed to:

(1) conduct a scientific assessment of the effects of past experimental high flows (including
powerplant capacity flows) at Glen Canyon Dam on high valued resources of concern to
the GCDAMP (i.e., recreational beaches, aquatic food base, rainbow trout fishery,
hydropower, humpback chub and other native fish, and cultural resources); and

(2) present initial findings in a written summary at the 2019 Annual Reporting Meeting and
the March 2019 AMWG meeting for review and discussion.

A next step would be for GCMRC to identify experimental flow options that would
consider high valued resources of concern to the GCDAMP (defined above), fill critical
data gaps, and reduce scientific uncertainties. [https://www.usbr.gov/uc/rm/amp/amwg/mtgs/18aug22/Motions_Action_Items.pdf]

*[https://www.usbr.gov/uc/progact/amp/amwg/2019-03-06-amwg-meeting/20190301-HFE_Extended_Abstracts-Combined_FINAL.pdf Extended abstracts from the science presentations given at the HFE Assessment segment of the March 2019 Annual Reporting Meeting]

|-
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">2015 HFE Synthesis Workshop</h2>
|-
|style="color:#000;"|

*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_HFE01.pdf GCDAMP High Flow Experiment Work Shop Introduction]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_HFE02.pdf Hydrology and Sediment Transport]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_HFE03.pdf Status and Trends of Sand in Glen, Marble, and Grand Canyons]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_HFE04.pdf Operations and Hydropower]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_HFE05.pdf HFE Impacts on Hualapai Lands]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_HFE06.pdf Sand Resources and Monitoring at Archaeological Sites in Glen and Grand Canyon]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_HFE07.pdf Big Flood, Small Flood, Spring Flood, Fall Flood: HFE Timing affects foodbase response in Lees Ferry]
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_HFE08.pdf Native and Nonnative Fishes in Glen, Marble and Grand Canyons]

|-
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">2010 HFE Workshop</h2>
|-
|style="color:#000;"|

*[https://www.usbr.gov/uc/rm/amp/twg/mtgs/10jun29/SW_SandBudget_Modeling.pdf Sand Budget Modeling by Scott A. Wright]
*[https://www.usbr.gov/uc/rm/amp/twg/mtgs/10jun29/KG_Hydrologic_Modeling.pdf Hydrologic Modeling by Katrina Grantz]
*[https://www.usbr.gov/uc/rm/amp/twg/mtgs/10jun29/Valdez_Workshop.pdf Biological Resources by Rich Valdez]
*[https://www.usbr.gov/uc/rm/amp/twg/mtgs/10jun29/JCS_USBR_June_17.pdf High Flows in Grand Canyon by Jack Schmidt]
*[https://www.usbr.gov/uc/rm/amp/twg/mtgs/10jun29/JK_Effects.pdf Effects of the 2008 High Flow Experiment on Abundance, Growth, and Survival Rates of Early Life Stages of Rainbow Trout in the Lees Ferry Reach of the Colorado River by Josh Korman]
*[https://www.usbr.gov/uc/rm/amp/twg/mtgs/10jun29/Spiker_GCD_Maintenance.pdf Glen Canyon Replacements and Maintendance by Max Spiker]

|-
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;"> [http://www.usbr.gov/uc/envdocs/ea/gc/HFEProtocol/index.html 2011 HFE Protocol EA] </h2>
|-
|style="color:#000;"|

*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Final%20HFE%20EA%20with%20Appendices/Appendix_A_FRN.pdf Appendix A: Federal Register Notice]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Final%20HFE%20EA%20with%20Appendices/Appendix_B_Science%20Plan.pdf Appendix B: Science Plan]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Final%20HFE%20EA%20with%20Appendices/Appendix_C_BA.pdf Appendix C: Biological Assessment]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Final%20HFE%20EA%20with%20Appendices/Appendix_D_HydrologicData.pdf Appendix D: Hydrologic Data]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Final%20HFE%20EA%20with%20Appendices/Appendix_E_SedimentAnalysis.pdf Appendix E: Sediment Analysis]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Final%20HFE%20EA%20with%20Appendices/Appendix_F_new.pdf Appendix F: Methods for Estimating the Impacts on Hydropower at GCD]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Final%20HFE%20EA%20with%20Appendices/Appendix_G_SHPO%20Letter.pdf Appendix G: SHPO Letter]

|-
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Power Plant Capacity Flow Tests </h2>
|-
|style="color:#000;"|

*Habitat Maintenance Flow (HMF) – September 1997
*[http://gcdamp.com/index.php?title=The_2000_Low_Summer_Steady_Flow_Experiment Low Summer Steady Flow: April – September 2000]; Included two powerplant-capacity flows, one in May and one in September
*California power emergencies 2000 - 2001: Included six powerplant capacity flows

|-
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;"> HFEs and the Colorado River Basin Project Act of 1968 </h2>
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|style="color:#000;"|

One area that has been a source of recent discussion has been the question of planned high releases from Glen Canyon Dam for such purposes as "beach habitat building flows." The Department expects the AMWG to work and provide its recommendations within the following context. Since the GCPA is clear that it was not intended to modify the compacts or "the provisions of the Colorado River Storage Project Act of 1956 and the Colorado River Basin Project Act of 1968 that govern allocation, appropriation, development, and exportation of the waters of the Colorado River Basin" (GCPA, section 1802(b)), any operational changes under the auspices of the GCPA are clearly subordinate to and must fit within the constraints of those provisions. Historically, there have been differences of legal opinion over some related issues, such as whether releases of water above power plant capacity, if made for authorized purposes, can be considered as not constituting "spills" within the meaning of section 602(a) of the Colorado River Basin Project Act of 1968 and the Operating Criteria implemented pursuant to section 602, and more recently over whether the GCPA "amends" existing law by adding additional authorized purposes for the operation of Glen Canyon Dam. These legal issues have not been finally resolved, but given the limitations provided in the ROD, the Glen Canyon Dam operating criteria, and the 1996 agreement between the Department and the Basin States, it is believed that they have been adequately addressed. [https://www.usbr.gov/uc/progact/amp/amwg/2002-07-17-amwg-meeting/Attach_10b.pdf]

|-
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Other Stuff</h2>
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|style="color:#000;"|

==Calculating the Cumulative Sand Load for an HFE==
# Determine the amount of sand that has come in from the Paria River during the HFE Accounting Period you are interested in. Go to the [http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09382000#/ '''Paria River gage at Lees Ferry'''] and check the Cumulative Sand Load box and enter the dates of the HFE Accounting Period.
# Determine the amount of sand that has been transported out of Marble Canyon during the HFE accounting period by taking the lower bound value of the change in sand storage in [http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09383050/09383100 '''Lower Marble Canyon'''] and subtracting it from the lower bound value of the change in sand storage in [http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09380000/09383050 '''Upper Marble Canyon'''].
# Subtract the amount of sand that has been transported out of Marble Canyon from the amount of sand that has come in from the Paria River and you get the amount of sand Reclamation uses for planning the HFE.

==Calculating Magnitude and Duration of an HFE==
Reclamation takes the amount of sand calculated above and subtracts the amount of sand that will be transported out of Marble Canyon between the time of the model run and the HFE. Reclamation then calculates the largest possible volume and duration release from the dam using the [https://pubs.er.usgs.gov/publication/70007515 '''Scott Wright sediment transport model'''] that does not result in a negative sand balance between the 30-mile gage and the LCR by the end of the accounting period.

==How much water can be released at Glen Canyon Dam?==
* 8 generators = 31,500 cfs
* 4 bypass tubes = 15,000 cfs
* 2 spillways (require reservoir elevations above 3648') = up to 208,000 cfs

==How often would an HFE be triggered? ([http://ltempeis.anl.gov/documents/final-eis/vol3/Appendix_P-HFE_Protocol.pdf LTEMP Appendix P]) ==
* Proactive Spring HFEs: 10% of years
* Sediment-triggered Spring HFEs: 26% of years
* Sediment-triggered Fall HFEs: 77% of years
* Extended-Duration Fall HFEs: 25% of years

|}

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Glen Canyon Dam Adaptive Management ADMINISTRATIVE HISTORY

2026-09-28T22:08:43Z

Cellsworth:

Glen Canyon Dam Adaptive Management ADMINISTRATIVE HISTORY

2026-09-18T19:37:03Z

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Glen Canyon Dam Adaptive Management ADMINISTRATIVE HISTORY

2026-09-18T18:04:36Z

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Glen Canyon Dam Adaptive Management ADMINISTRATIVE HISTORY

2026-09-18T17:15:33Z

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GCDAMP Sediment

2026-09-17T20:30:40Z

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[[File:Paria at mainstem.jpg|center|thumbnail|400px|The Paria River flowing into the mainstem Colorado River‎]]<br>


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==[http://www.gcmrc.gov/research_areas/sediment_geomorphology/sed/Sed_Geomorph_Home_Page.aspx '''Sediment and Geomorphology''']==

Erosion of sandbars (beaches) along the Colorado River in Grand Canyon was first reported in the early 1970s, approximately 10 years after completion of Glen Canyon Dam. Since then, scientific studies have been conducted to monitor changes in sandbars and changes in the amount of sand stored on the bed of the river. One of the outcomes of these studies has been the implementation of flow experiments intended to rebuild eroded sandbars, especially by the release of controlled floods, also called [http://gcdamp.com/index.php?title=The_HFE_Page '''High Flow Experiments, or HFEs,'''] from Glen Canyon Dam. The sediment and geomorphology projects at Grand Canyon Monitoring and Research Center include the collection and processing of data to provide information needed to conduct controlled floods and to evaluate the outcome of each controlled flood and the long-term effects of controlled floods and normal dam operations on sediment-related resources. [https://www.gcmrc.gov/research_areas/sediment_geomorphology/sed/Sed_Geomorph_Home_Page.aspx]

Beginning in 1998, [http://gcdamp.com/index.php?title=RECREATION '''recreational campsite area'''] has also been measured on a subset of the sandbar monitoring sites. Campsite areas are defined as areas that are flat (less than 8 degree slope), smooth (not rocky), and clear of dense vegetation. Monitoring data show that vegetation expansion and sandbar erosion/deposition contribute to reductions in campsite area.

==[http://gcdamp.com/index.php?title=Long-term_Experimental_and_Management_Plan_(LTEMP) '''LTEMP Resource Goal''']==
Increase and retain fine sediment volume, area, and distribution in
the Glen, Marble, and Grand Canyon reaches above the elevation of the
average base flow for ecological, cultural, and recreational purposes.

==[http://gcdamp.com/index.php?title=Portal:Desired_Future_Conditions_-DFCs '''Desired Future Condition''']==
High elevation open riparian sediment deposits along the Colorado River in sufficient volume, area, and distribution so as to provide habitat to sustain native biota and desired ecosystem processes<br>
• Nearshore habitats for native fish<br>
• Marsh and riparian habitat for fish (food chain maintenance)<br>
• Cultural resource preservation<br>
• Maintenance of camping beaches<br>

==[[Media:USGS GCMRC Status of LTEMP Metrics Report Dec11 2025-508Comp.pdf| '''Metrics''']]==
Performance Metric:
*Sand Bar Volume (includes multiple “sub-metrics”, e.g., normalized sandbar volume by type, mean sand bar response to HFEs)

Surveillance Metrics:
*Sand Supply By River Segment (Sand Mass Balance)
*Silt & Clay Retention by River Segment (Turbidity)

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! style="width=33%; background:#cedff2;" | [[TBD|---]]<br>
! style="width=33%; background:#cedff2;" | [[TBD|---]]<br>
! style="width=33%; background:#cedff2;" | [[TBD|---]]<br>
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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; text-align:left; color:#000; padding:0.2em 0.4em;"> Updates </h2>
|-
|style="color:#000;"|

[[File:SedimentSustainability.PNG|center|thumbnail|500px|https://www.usbr.gov/uc/progact/amp/twg/2022-01-13-twg-meeting/20220113-AnnualReportingMeeting-ProjectA-StreamflowWaterQualitySedimentTransportBudgetingColoradoRiverEcosystem-508-UCRO.pdf ]]

[[File:LongtermDecline.PNG|center|thumbnail|500px|https://www.usbr.gov/uc/progact/amp/twg/2022-01-13-twg-meeting/20220113-AnnualReportingMeeting-ProjectA-StreamflowWaterQualitySedimentTransportBudgetingColoradoRiverEcosystem-508-UCRO.pdf ]]

[[File:SandbarMonitoring2016.jpg|center|thumbnail|500px|[https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR3_Grams.pdf https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR3_Grams.pdf] ]]

[[File:2012 2014 HFE response.jpg|center|thumbnail|500px|[https://www.usbr.gov/uc/rm/amp/twg/mtgs/15jun11/Attach_02,.pdf https://www.usbr.gov/uc/rm/amp/twg/mtgs/15jun11/Attach_02,.pdf] ]]

[[File:2016 SedimentSummary.jpg|center|thumbnail|500px|[https://www.usbr.gov/uc/rm/amp/twg/mtgs/16jan26/documents/AR02_Grams.pdf https://www.usbr.gov/uc/rm/amp/twg/mtgs/16jan26/documents/AR02_Grams.pdf] ]]

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;"> Sediment transport and river discharge </h2>
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When the discharge of the Colorado River was lower than about 9,000 ft3/s, sand accumulated in the reach in Marble and upper Grand Canyons. At discharges higher than about 9,000 ft3/s, however, sand-transport rates at the Grand Canyon gaging station generally equaled those at the Lees Ferry gaging station, and at discharges higher than about 16,000 ft3/s, sand-transport rates at the Grand Canyon gaging station generally either equaled or exceeded those at the Lees Ferry gaging station. Thus, at discharges greater than about 9,000 ft3/s, sand was either conveyed through or eroded from the reach in Marble and upper Grand Canyons.

As discharges less than 9,000 ft3/s became less common, the discharge of the river became progressively more conducive to the conveyance of sand through or the erosion of sand from Marble and upper Grand Canyons. [https://pubs.usgs.gov/pp/pp1677/pdf/pp1677.pdf]

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;"> How long is sand stored on the bed of the river? </h2>
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Bedrock-canyon rivers tend to be supply limited because they are efficient transporters of sediment and not because the upstream supply of sediment is small. Following episodic tributary floods that supply finer sand, sand migrates quickly downstream in the form of a wave in which large systematic changes in bed-sand grain size occur. The tributary fine-sediment (i.e., sand, silt, and clay) supply to the Colorado River in our study area is bimodal, with a clay primary mode and a sand-silt secondary mode. The tributary sand supply grades smoothly into the silt-and-clay supply such that the sand-size sediment comprises the coarser part of this secondary mode, which occurs in very fine sand (0.0625–0.125 mm) for the Paria River and in medium silt (0.0156–0.0312 mm) for the LCR. Both tributaries supply more silt and clay to the Colorado River than they do sand. During sediment years 1998–2017, silt and clay comprised 60.6% and 88.1% of the fine sediment supplied by the Paria River and LCR, respectively. Of the total amount of sand supplied since 2011, the Paria River has contributed 57%, the LCR has contributed 21%, and all other tributaries combined have contributed 22%. The largest quantities of sand are supplied by the Paria River and LCR during summer thunderstorm-generated floods that last hours to a day. Large sand loads are rare during winter and spring months on both rivers.

Our late-1990s observations suggested that tributary floods generated sand waves that split into two packets, A and B: packet A was finer than packet B and migrated downstream in the Colorado River with a celerity slightly slower than the water velocity. Packet B migrated much more slowly than packet A; the amalgamated front of packet B had migrated only ∼10 km in the 3 and 10 days after two Paria River floods. The primary peak in QSAND—1/βQ cross covariance decays to background within 7–20 days of a tributary flood at all but the RK49 station, thus indicating that much of packet A exits our study area quickly. The lower celerity of packet B causes the secondary cross-covariance peak to become distinct from the primary peak with increasing distance downstream. '''Following a Paria River flood, the secondary peak (packet B) separates from the primary peak (packet A) between the RK49 and RK99 stations, and it takes ∼198 and ∼290 days for the tail of packet B to respectively reach these stations. Following an LCR flood, packet B separates from packet A upstream from the RK141 station, and it takes ∼261 days for the tail of packet B to reach this station.''' [https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2020JF005565]

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;"> Sediment Augmentation </h2>
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[http://www.riversimulator.org/Resources/USBR/LTEP/Randle2007.pdf Randle, T.J., Lyons, J.K., Christensen, R.J., and Stephen, R.D., 2007, Colorado River ecosystem sediment augmentation appraisal engineering report: Bureau of Reclamation, Technical Service Center, Sedimentation and River Hydraulics Group, Denver, Colorado, 71 p.]

Grand Canyon sediment augmentation would have two primary purposes:

#Seasonally increase the turbidity of the Colorado River to provide cover for native and endangered fish during the months of May through December. This is the period when young-of-the year humpback chub emerge from the Little Colorado River and then rear in the Colorado River (U.S. Department of the Interior, Bureau of Reclamation, 1995). These native fish evolved in a turbid environment and may use it for cover from potential predators.
#Annually increase the sand supply to the Colorado River during beach-building flows to build larger sandbars, especially in Marble Canyon, through fluvial processes.

Sediment slurry pipelines that would deliver sediment from the Navajo Canyon arm of
Lake Powell to the Colorado River below Glen Canyon Dam or near Lees Ferry are
believed to be technically feasible. Five sediment augmentation alternatives have been
formulated and evaluated. Alternatives are available to deliver fine sediment and sand to
the Colorado River, either below Glen Canyon Dam or near Lees Ferry.

Attempts have been made to formulate each alternative to minimize environmental
impacts and to avoid cultural resource impacts. No major environmental impacts for any
of the five alternatives have been identified at this time.

Sediment source areas in Lake Powell seem to be the most logical choice because of cost
and because the sediments in Lake Powell would have naturally reached the Colorado
River below the site of Glen Canyon Dam. Sediment source areas in Navajo Canyon are
much closer to Glen Canyon Dam than other major source areas in Lake Powell.
Laboratory analysis of one sediment sample from Navajo Canyon did not detect any
contaminants above background levels. A more intensive sediment sampling program
would be needed to verify if this finding is applicable to more of the sediments within
Navajo Canyon.

Although the present and future sedimentation volumes in Navajo Canyon may not be
enough to sustain a Grand Canyon sediment augmentation program over the long term,
the volumes should be sufficient for one or two decades (see figure 8). Sediments in
Navajo Canyon could be dredged first and then the submerged slurry pipelines and
floating pumping stations could be moved to an upstream source such as the Escalante
River or San Juan River deltas.

Sediment slurry pipelines can deliver large quantities of sediment, and over long
distances, much more efficiently and at less cost than barges or trucks. Submerging
sediment slurry pipelines in Lake Powell appears to be a viable option with much less
impact than overland routes from major sediment source areas in Lake Powell where no
direct roads presently exist.

The augmentation of fine sediment should be considered in conjunction with alternatives
that would increase the summer water temperatures released from Glen Canyon Dam
(e.g., selective withdrawal of water from Lake Powell). Native and endangered fish in
Grand Canyon National Park are impacted by less turbidity and colder water
temperatures in summer compared to natural conditions (U.S. Department of the Interior,
Bureau of Reclamation, 1995). Turbidity may provide native fish with cover from
predation. In the absence of turbid conditions, native fish tend not to be active during the
day (U.S. Department of the Interior, Bureau of Reclamation, 1995). Although, colder
water temperatures may impact young-of-the-year native fish in summer, the colder
temperatures may also keep non-native warm-water fish from migrating upstream
through Grand Canyon National Park. If water temperatures are increased, there is a
concern that non-native warm-water fish may have the advantage (U.S. Department of
the Interior, Bureau of Reclamation, 1995). The augmentation of fine sediment may
provide the necessary cover for native and endangered fish.

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Links and Information</h2>
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*[http://gcdamp.com/index.php?title=Portal:GCDAMP_Knowlege_Assessments GCMRC Annual Reports page]
*[https://www.gcmrc.gov/sandbar/ GCMRC Grand Canyon Sandbar Monitoring]
*[http://gcdamp.com/index.php?title=The_HFE_Page The High Flow Experiment (HFE) Page]
*[http://gcdamp.com/index.php?title=RECREATION Recreation Page]
*[[Aeolian Sand Transport| Aeolian Sand Transport Page]]
*[http://gcdamp.com/index.php?title=Turbidity Turbidity Page]
*[http://gcdamp.com/index.php?title=GCDAMP-_Over-Flights Over Flights Page]

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">[https://www.gcmrc.gov/research_areas/sediment_geomorphology/sed/Sed_Geomorph_Home_Page.aspx Projects]</h2>
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*[https://www.gcmrc.gov/sandbar/ Sandbar Monitoring]
*[https://www.gcmrc.gov/research_areas/sediment_geomorphology/sed/Sed_Geomorph_Camp.aspx Campsite Monitoring]
*[https://www.gcmrc.gov/discharge_qw_sediment/ Suspended Sediment Transport ]
*[https://www.gcmrc.gov/research_areas/sediment_geomorphology/sed/Sed_Geomorph_Home_Page.aspx Automated Substrate Classification Using Swath Mapping Systems]
*[https://www.gcmrc.gov/research_areas/sediment_geomorphology/sed/Sed_Geomorph_storage.aspx Sediment Storage]
*[https://www.gcmrc.gov/research_areas/sediment_geomorphology/sed/Sed_Geomorph_Home_Page.aspx Underwater Photography to Measure Bed Grain Size ]

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Sediment Gages</h2>
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*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-GCLT1 Water Holes Canyon above the mouth]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09381800 Paria River near Kanab, UT]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09382000 Paria River at Lees Ferry, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09380000 Colorado River at Lees Ferry]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT1 Badger Creek below highway 89A near Vermillion Cliffs, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT2 Tanner Wash below highway 89A near Bitter Springs, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT3 House Rock Wash above Emmett Wash near Cliff Dwellers, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT5 North Canyon near Cliff Dwellers, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT6 Shinumo Wash in Twentynine Mile Canyon near Cedar Ridge, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09383050 Colorado River near river mile 30]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09383100 Colorado River above Little Colorado River near Desert View, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401500 Moenkopi Wash near Cameron, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401000 Little Colorado River at Grand Falls, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401200 Little Colorado River at Cameron, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402000 Little Colorado River near Cameron, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402300 Little Colorado River above the mouth near Desert View, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402500 Colorado River near Grand Canyon, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09403000 Bright Angel Creek near Grand Canyon, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT6 Shinumo Creek]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09403850 Kanab Creek above the mouth near Supai, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404115 Havasu Creek above the mouth near Supai, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404120 Colorado River above National Canyon near Supai, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404200 Colorado River above Diamond Creek near Peach Springs, AZ]

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Sand Mass Balance Reaches in Grand Canyon </h2>
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*[http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09380000/09383050 Upper Marble Canyon]
*[http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09383050/09383100 Lower Marble Canyon]
*[http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09383100/09402500 Eastern Grand Canyon]
*[http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09402500/09404120 East Central Grand Canyon]
*[http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09404120/09404200 West Central Grand Canyon]
*[http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09404200/Pearce%20Ferry Western Grand Canyon and the Lake Mead Delta]

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;"> Presentations and Papers </h2>
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'''2026'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2026-02-26-amwg-meeting/uc-gcdamp-amwg-interdisciplinarysediment-508-20260226.pdf Interdisciplinary Sediment, Riparian Vegetation, and Cultural Resource Science]
*[https://www.usbr.gov/uc/progact/amp/amwg/2026-02-26-amwg-meeting/uc-gcdamp-amwg-ltempsandmanagement-508-20260226.pdf Evaluation of LTEMP sand management]
*[https://www.usbr.gov/uc/progact/amp/twg/2026-02-05-twg-meeting/uc-gcdamp-arm-riverbed-sandbarresponse-508-20260205.pdf Riverbed and Sandbar Response to Glen Canyon Dam Operations and High-Flow Experiments]
*[https://www.usbr.gov/uc/progact/amp/twg/2026-02-05-twg-meeting/uc-gcdamp-arm-evaluationsandmanagement-508-20260205.pdf Evaluation of LTEMP sand management]
*[https://www.usbr.gov/uc/progact/amp/twg/2026-02-05-twg-meeting/uc-gcdamp-arm-sandmanagement-508-20260205.pdf Reservoir Operational Strategies for Sustainable Sand Management in the Colorado River]

'''2025'''
*[https://www.usbr.gov/uc/progact/amp/twg/2025-04-10-twg-meeting/uc-gcdamp-twg-arm-goal7metrics-508-20250410.pdf Goal 7 Metrics: Sediment]
*[https://www.usbr.gov/uc/progact/amp/twg/2025-04-10-twg-meeting/uc-gcdamp-twg-arm-projecta-508-20250410.pdf Project A: Streamflow, Water Quality, and Sediment Transport and Budgeting in the Colorado River Ecosystem]

'''2024'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2024-02-29-amwg-meeting/20240229-ProjectB-UpdateRiverbedSandbarResponseDamOperationsHFE-508-UCRO.pdf Project B Update and Riverbed and sandbar response to dam operations and high-flow experiments ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2024-02-29-amwg-meeting/20240229-ProjectA-StreamflowWaterQualitySedimentTransportBudgetingColoradoRiverEcosystem-508-UCRO.pdf Project A: Streamflow, Water Quality, and Sediment Transport and Budgeting in the Colorado River Ecosystem ]
*[https://www.usbr.gov/uc/progact/amp/twg/2024-01-25-twg-meeting/20240125-AnnualReportingMeeting-EffectsDamOperationsVegetationManagementPreservationGeomorphicConditionArchaeologicalSites-508-UCRO.pdf Effects of Reservoirs and Stock Ponds on Surface Water Runoff in the Little Colorado River Basin ]
*[[Media:Sartain_AGU2023_poster_ARM.pdf| Assessing geomorphic change for 454 river km of the Colorado River in Grand Canyon, AZ via continuous and high-resolution water surface and bed profiles
]]
*[[Media:Kaplinski_Glen_canyon_flow_model_poster_20240114.pdf| Hydrodynamic modeling of the Colorado River between Glen Canyon Dam and Lees Ferry, Arizona]]

'''2024'''
*[https://doi.org/10.3133/ofr20231093 Griffiths et al., 2024, Changes in sand storage in the Colorado River in Grand Canyon National Park from July 2017 through June 2020]
*[https://www.usbr.gov/uc/progact/amp/twg/2024-01-25-twg-meeting/20240125-AnnualReportingMeeting-ChannelResponseHighFlowsWesternGrandCanyon-508-UCRO.pdf Channel Response to High Flows in Western Grand Canyon ]
*[https://www.usbr.gov/uc/progact/amp/twg/2024-01-25-twg-meeting/20240125-AnnualReportingMeeting-ProjectAStreamflowWaterQualitySedimentTransportBudgetingColoradoRiverEcosystem-508-UCRO.pdf Project A: Streamflow, Water Quality, and Sediment Transport and Budgeting in the Colorado River Ecosystem ]
*[https://www.usbr.gov/uc/progact/amp/twg.html#:~:text=Project%20B%20Update%20and%20Riverbed%20and%20sandbar%20response%20to%20dam%20operations%20and%20high%2Dflow%20experiments Project B Update and Riverbed and sandbar response to dam operations and high-flow experiments ]

'''2023'''
*[https://www.usbr.gov/uc/progact/amp/twg/2023-01-26-twg-meeting/20230126-AnnualReportingMeeting-AContinuousHigh-ResolutionProfileRiverbedWaterSurface460-kmColoradoRiverGrandCanyon-508-UCRO.pdf A Continuous High-Resolution Profile of the Riverbed and Water Surface for 460-km of the Colorado River in Grand Canyon]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-01-26-twg-meeting/20230126-AnnualReportingMeeting-StreamflowSedimentVegetationDynamics-508-UCRO.pdf Project A: Streamflow, Sediment, and Vegetation Dynamics; Implications for Geomorphic Change in the Colorado River and its Tributaries]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-01-26-twg-meeting/20230126-AnnualReportingMeeting-StreamflowWaterQualitySedimentTransportBudgetingColoradoRiverEcosystem-508-UCRO.pdf Project A: Streamflow, Water Quality, and Sediment Transport and Budgeting in the Colorado River Ecosystem]
*[[Media:ARM_salter.pdf| Numerical Modeling of Mud Transport, Storage, and Release on the Colorado River, Arizona]]

'''2022'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-08-18-amwg-meeting/20220818-Grams_Sandbars_AMWG_BAO_508.pdf Multi-Decadal Sandbar Response to Flow Management Downstream from a Large Dam-The Glen Canyon Dam on the Colorado River in Marble and Grand Canyons, AZ ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-02-10-amwg-meeting/20220210-SummarySedimentSandbarProjects-508-UCRO.pdf Summary of Sediment and Sandbar Projects GCMRC Projects A and B LTEMP Goal 7 ]
*[https://www.usbr.gov/uc/progact/amp/twg/2022-01-13-twg-meeting/20220113-AnnualReportingMeeting-ProjectA-StreamflowWaterQualitySedimentTransportBudgetingColoradoRiverEcosystem-508-UCRO.pdf Project A: Streamflow, Water Quality, and Sediment Transport and Budgeting in the Colorado River Ecosystem ]

'''2021'''
*[[Media:Glen Canyon Sand Augmentation White Paper.pdf| Argonne. 2021. Evaluation of Sand Augmentation for Stabilizing Recreational Beaches and Storing Sand in Glen Canyon National Recreation Area]]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-10-14-twg-meeting/20211014-MorphodynamicModelEvaluateSandbarRebuilding-Presentation-508-UCRO.pdf A simple morphodynamic model to rapidly evaluate sandbar rebuilding during controlled floods]
*[https://doi.org/10.1029/2020JF005565 Topping et al. 2021, Self-limitation of sand storage in a bedrock-canyon river arising from the interaction of flow and grain size: Journal of Geophysical Research: Earth Surface]
*[https://doi.org/10.1029/2021JF006149 Alvarez et al. 2021, An eddy-resolving numerical model to study turbulent flow, sediment, and bed evolution using detached eddy simulation in a lateral separation zone at the field-scale: Journal of Geophysical Research—Earth Surface]
*[https://www.usbr.gov/uc/progact/amp/amwg/2021-02-11-amwg-meeting/20210211-SandSupplyTransportDeposition-508-UCRO.pdf Sand Supply, Transport and Deposition ]

'''2020'''
*[https://doi.org/10.1029/2019JF005226 Rubin et al., 2020, Causes of variability in suspended‐sand concentration evaluated using measurements in the Colorado River in Grand Canyon: JGR Earth Surface]
*[https://www.usbr.gov/uc/progact/amp/amwg/2020-02-12-amwg-meeting/20200212-GCMRCScienceUpdatesPart3-Presentation-508-UCRO.pdf GCMRC 2019 Annual Reporting Meeting Overview – Part 3 ]
*[https://doi.org/10.1130/B35642.1 Chapman et al., 2020, Estimating the contribution of tributary sand inputs to controlled flood deposits for sandbar restoration using elemental tracers, Colorado River, Grand Canyon National Park, Arizona: GSA Bulletin] [https://doi.org/10.5066/P9C0IN56 Associated data]
*[https://www.usbr.gov/uc/progact/amp/twg/2020-01-13-twg-meeting/20200113-AnnualReportingMeeting-ProjectBEffectsDamReleaseSedimentStorageSandbarDynamics-Presentation-508-UCRO.pdf Project B: Effects of dam releases on in-channel sediment storage and sandbar dynamics ]
*[https://doi.org/10.1029/2019WR025883 Ashley et al., 2020, Estimating bedload from suspended load and water discharge in sand bed rivers: Water Resources Research.]
*[https://www.usbr.gov/uc/progact/amp/twg/2020-01-13-twg-meeting/20200113-AnnualReportingMeeting-GeomorphicChangeBiogeomorphicFeedbacksLittleColoradoRiver-Presentation-508-UCRO.pdf Geomorphic Change and Biogeomorphic Feedbacks in the Little Colorado River, Arizona ]

'''2019'''
*[https://doi.org/10.1130/B35047.1 Dean, D.J., and Topping, D.J., 2019, Geomorphic change and biogeomorphic feedbacks in a dryland river--The Little Colorado River, Arizona, USA: GSA Bulletin ]

'''2018'''
*[https://qcnr.usu.edu/wats/colorado_river_studies/files/documents/Rubin.pdf Sand tells a story]
*[https://doi.org/10.5066/P99TN424 Sankey et al., 2018, Sand classifications along the Colorado River in Grand Canyon derived from 2002, 2009, and 2013 high-resolution multispectral airborne imagery: U.S. Geological Survey data release]
*[https://www.usbr.gov/uc/progact/amp/amwg/2018-08-22-amwg-meeting/Attach_12.pdf GCMRC Science Updates PPT]
*[https://doi.org/10.1002/rra.3349 Hadley et al., 2018, Quantifying geomorphic and vegetation change at sandbar campsites in response to flow regulation and controlled floods, Grand Canyon National Park, Arizona: River Research and Applications]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-01-25-twg-meeting/AR02.pdf Key drivers of sand transport and storage in the Colorado River Ecosystem PPT]
*[https://doi.org/10.5194/hess-22-1767-2018 Voichick, N. et al., 2018, Technical note--False low turbidity readings during high suspended-sediment concentrations: Hydrology and Earth System Sciences]
*[https://doi.org/10.3133/ofr20181019 Grams et al., 2018, Automated remote cameras for monitoring alluvial sandbars on the Colorado River in Grand Canyon, Arizona: Open-File Report]

'''2017'''
*[[Media:Chapman 2017 Thesis-Determining tributary sediment exp flood deposits Marble Canyon ColRiv.pdf| Chapman, K., 2017, Determining the tributary sediment contribution to experimental flood deposits on the Colorado River in Marble Canyon, Grand Canyon, Arizona: Flagstaff, Northern Arizona University, MS thesis]]
*[https://digitalcommons.usu.edu/etd/6635 Hamill, D., 2017, Quantifying riverbed sediment using recreational-grade side scan sonar: Logan, Utah State University, MS thesis]
*[http://dx.doi.org/10.1002/2017JF004302 Buscombe et al., 2017, Compositional signatures in acoustic backscatter over vegetated and unvegetated mixed sand-gravel riverbeds: Journal of Geophysical Research: Earth Surface]
*[https://doi.org/10.1016/j.geomorph.2017.08.037 Griffiths and Topping, 2017, Importance of measuring discharge and sediment transport in lesser tributaries when closing sediment budgets: Geomorphology]
*[https://doi.org/10.3133/ofr20171030 Kaplinski et al. 2017. Channel mapping river miles 29–62 of the Colorado River in Grand Canyon National Park, Arizona, May 2009: U.S. Geological Survey Open-File Report 2017–1030]
*[https://www.usbr.gov/uc/progact/amp/twg/2017-01-26-twg-meeting/AR1_Topping.pdf Project 1: Streamflow, Water Quality, Sediment Transport, and Sand Budgets in the Colorado River Ecosystem ]
*[https://www.usbr.gov/uc/progact/amp/twg/2017-01-26-twg-meeting/AR2_Dean.pdf Project 2: Hydrologic Change and the Geomorphic Transformation of the Little Colorado River: Implications for Sediment Delivery to the Grand Canyon ]
*[https://www.usbr.gov/uc/progact/amp/twg/2017-01-26-twg-meeting/AR3_Grams.pdf Sandbars and Sediment Storage in Marble and Grand Canyons: Response to Recent High-flow Experiments and Long-term Trends ]

'''2016'''
*[https://pubs.er.usgs.gov/publication/pp1823 Topping et al. 2016. Long-term continuous acoustical suspended-sediment measurements in rivers — Theory, application, bias, and error: U.S. Geological Survey Professional Paper 1823]
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-08-24-amwg-meeting/Attach_11a.pdf Sandbar Modeling Project Update]
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-08-24-amwg-meeting/Attach_07b.pdf Status of Sediment Resources – August 2016]
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-08-24-amwg-meeting/Attach_07a.pdf Grand Canyon Monitoring and Research Center Science Updates and PPT (BO Compliance, Trout Updates, Green Sunfish, Fisheries PEP, Partners in Science)]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/AR03_Buscombe.pdf Observations of sand dune migration on the Colorado River in Grand Canyon using high-resolution multibeam bathymetry]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/AR01_Topping.pdf Project 2: Streamflow, Water Quality, Sediment Transport, and Sand Budgets in the Colorado River Ecosystem]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/AR02_Grams.pdf Sandbars and Sediment Storage in Marble and Grand Canyons: Response to Recent high-flow Experiments and Long-Term Trends]

'''2015'''
*[https://eos.org/features/building-sandbars-in-the-grand-canyon Grams et al. 2015. Building Sandbars in the Grand Canyon, EOS, Trans. Am. Geophys. Union]
*[http://repository.asu.edu/items/30069 Alvarez. 2015. Turbulence, Sediment Transport, Erosion, and Sandbar Beach Failure Processes in Grand Canyon. Ph.D. Dissertation, Arizona State University, Tempe, AZ]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGeUVIWEwyY1l6RUE/view GCMRC Science Update - Sediment]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-06-11-twg-meeting/Attach_02,.pdf GCMRC Science Update - Sediment]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGQURtV2s3eWJqRHM/view Updates on 2014 HFE, Paria sediment inputs, and sediment mass balance]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-04-21-twg-meeting/Attach_11.pdf Glen Canyon Tailwater Fishery “Integrating Fish and Channel Mapping”]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-04-21-twg-meeting/Attach_13.pdf GCMRC’s Online Mapping and GIS Resources]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-01-20-twg-meeting/Attach_01.pdf Streamflow, Water Quality, and Sediment Transport in the Colorado River Ecosystem]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-01-20-twg-meeting/Attach_02.pdf Sandbars and Sediment Storage in Marble and Grand Canyons: Response to Recent High-flow Experiments and Long-term Trends]

'''2014'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-08-27-amwg-meeting/Attach_04a.pdf Science Updates - Recent Research on Sand, Bugs, and Fish ]
*[https://www.usbr.gov/uc/progact/amp/twg/2014-01-30-twg-meeting/AR_Grams_Sandbar_Storage.pdf Sandbars and Sand Storage in Marble and Grand Canyons (Grams) ]
*[https://www.usbr.gov/uc/progact/amp/twg/2014-01-30-twg-meeting/AR_Griffiths_Processing.pdf Processing fine sediment transport data: procedures, processing, and bottlenecks (Griffiths) ]

'''2013'''
*[https://asu.pure.elsevier.com/en/publications/erosion-of-river-sandbars-by-diurnal-stage-fluctuations-in-the-co Alvarez and Schmeeckle. 2013. Erosion of river sandbars by diurnal stage fluctuations in the Colorado river in the Marble and Grand Canyons: Full-scale laboratory experiments]
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/13nov06/Attach_02a.pdf GCMRC Update - Status of Resources and Sediment Conditions]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-08-08-amwg-meeting/Attach_06d.pdf Present Status of Sediment Resources-August 2013]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-08-08-amwg-meeting/Attach_06a.pdf Science Updates - Overflights, Riparian Vegetation, and Sediment]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-06-26-twg-meeting/Attach_07a.pdf 2013 Overflight Wrap up]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-06-26-twg-meeting/Attach_07b.pdf GCMRC Science Update on Sediment and Fisheries]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-01-24-twg-meeting/15_Topping.pdf Sediment Monitoring Program: Sediment Delivery from Tributaries and Sediment Transport by Colorado River]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-01-24-twg-meeting/16_Grams.pdf Sandbar Monitoring for November 2012 Controlled Flood]

'''2012'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-08-29-amwg-meeting/Attach_04a.pdf GCMRC Updates and Sediment Update ]
*[https://www.usbr.gov/uc/progact/amp/twg/2012-06-20-twg-meeting/Attach_09.pdf E-mail to TWG with Sediment Model Link]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Attach_08.pdf GCMRC Updates and PPT]
*[https://www.gcmrc.gov/about/ka/KA%202%20-%201-31-12/PM%20Talks/Grams%200400-0500.pdf Sandbars and In-Channel Sand Storage: Short-Term Dynamics and Long-Term Trends ]
*[https://www.gcmrc.gov/about/ka/KA%202%20-%201-31-12/PM%20Talks/Topping%200200-0300.pdf Physical controls on sediment deposition, erosion, and transport ]
*[https://www.gcmrc.gov/about/ka/KA%202%20-%201-31-12/PM%20Talks/Melis%200300-0400.pdf Geomorphic Framework & Role of Debris Flows Suspended-Sediment Transport and Sandbars Glen Canyon Dam Operations -Post-EIS Summary ]
*[https://www.gcmrc.gov/about/ka/KA%202%20-%201-31-12/PM%20Talks/Schmidt%200100-0200.pdf A Conversation about Rivers and Dams ]
*[https://www.gcmrc.gov/about/ka/KA%202%20-%202-1-12/PM%20Talks/Wright%200200-0300%20Modeling%20101.pdf Modeling 101 ]

'''2011'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-08-24-amwg-meeting/Attach_06.pdf GCMRC Updates]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-06-28-twg-meeting/Attach_05.pdf Update on Sand Mass Balance with Modeling]

'''2010'''
*[https://pubs.usgs.gov/of/2010/1133/OFR_2010-1133.pdf Wright, S.A., and Grams, P.E., 2010, Evaluation of Water Year 2011 Glen Canyon Dam flow release scenarios on downstream sand storage along the Colorado River in Arizona: U.S. Geological Survey Open-File Report 2010-1133]
*[https://www.usbr.gov/uc/progact/amp/twg/2010-11-15-twg-meeting/Attach_11d.pdf Update on Water Quality and 2010 Sand Input ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_03a.pdf Grand Canyon Monitoring and Research Updates and the Following Open File Reports: 1) Evaluation of Water Year 2011 Glen Canyon Dam Flow Release Scenarios on Downstream Sand Storage Along the Colorado River in Arizona, and 2) An Approach to Modeling Sediment Budgets in Supply-limited Rivers]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_03b.pdf Report on Sediment Modeling to Support Development of 2011 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_03c.pdf Update on 2010 Sediment Inputs]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_12a.pdf Temperature Control Device and Sediment Augmentation Report]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_12b.pdf TWG Chair Temperature Control Device/Sediment Augmentation]
*[https://www.usbr.gov/uc/progact/amp/twg/2010-06-29-twg-meeting/Attach_01b.pdf Minutes from June 21, 2010, TWG Webinar/Conference Call with Memo from John Hamill to Shane Capron dated May 17, 2010, Subject: TWG and stakeholder requests for GCMRC to evaluate the effects of various dam operation scenarios on sediment storage and loss in the Grand Canyon with Open File Report 2010-1133]
*[https://www.usbr.gov/uc/progact/amp/twg/2010-06-29-twg-meeting/Attach_10.pdf Mechanics and Modeling of Flow, Sediment Transport and Morphologic Change in Riverine Lateral Separation Zones]
*[https://www.usbr.gov/uc/progact/amp/twg/2010-03-15-twg-meeting/Attach_07.pdf Sediment and Temperature Modeling Update PPT as presented at January 2010 Annual Reporting Meeting]
*[https://www.usbr.gov/uc/progact/amp/twg/2010-01-21-twg-meeting/Attach_07.pdf AIF: Temperature Control Device and Sediment Augmentation and PPT]

'''2009'''
*[https://www.usbr.gov/uc/progact/amp/twg/2009-09-29-twg-meeting/Attach_14.pdf Selective Withdrawal and Sediment Augmentation Update PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2009-09-29-twg-meeting/Attach_06.pdf Grand Canyon Monitoring and Research Center Updates]
*[https://www.usbr.gov/uc/progact/amp/twg/2009-06-22-twg-meeting/Attach_04.pdf Sandbar Evolution: Extending the Historical Perspective PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-04-29-amwg-meeting/Attach_03a.pdf AIF: Grand Canyon Monitoring and Research Center (GCMRC) Update]
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-04-29-amwg-meeting/Attach_03d.pdf Water Quality and Sediment, 2008 High Flow Experiment, and Integrated Flow, Temperature, and Sediment Modeling PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2009-03-16-twg-meeting/Attach_05.pdf Grand Canyon Monitoring and Research Center updates by Program Managers]
*[https://www.usbr.gov/uc/progact/amp/twg/2009-03-16-twg-meeting/Attach_10.pdf Diamond Creek Gage Discontinuation]

'''2008'''
*[http://www.riversimulator.org/Resources/Hydrology/WrightGSA2008.pdf Is there enough sand? Evaluating the fate of Grand Canyon sandbars]

'''2007'''
*[http://www.riversimulator.org/Resources/USBR/LTEP/Randle2007.pdf Randle et al. 2007. Colorado River Ecosystem Sediment Augmentation Appraisal Engineering Report]

'''2003'''
*[https://pubs.usgs.gov/pp/pp1677/pdf/pp1677.pdf Topping et al. 2003. Computation and analysis of the instantaneous-discharge record for the Colorado River at Lees Ferry, Arizona, May 8, 1921 through September 30, 2000: U.S. Geological Survey Professional Paper 1677]

'''1999'''
*[https://www.usbr.gov/uc/rm/amp/twg/mtgs/10jun29/Attach_11.pdf Floods and Sandbars in the Grand Canyon, a publication of the Geological Society of America (published in GSA Today, April 1999)]

'''1988'''
*[https://pubs.usgs.gov/of/1987/0561/report.pdf Schmidt and Graf, 1988, Aggradation and degradation of alluvial sand deposits, 1965 to 1986, OFR 87-561]

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Other Stuff </h2>
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----

*Eddies occur adjacent to rapids and the flow in the eddy is related to the flow characteristics in the rapid. Sand bars were typically larger before the dam.(Science Background for HFE Planning- Jack Schmidt, GCMRC_KA 2013)
*[http://www.usbr.gov/uc/rm/amp/amwg/mtgs/02jan17/Attach_10b.pdf Sediment Presentation- AMWG Jan 2002]
*[http://www.usbr.gov/uc/rm/amp/amwg/mtgs/02jan17/Attach_10a.pdf Sediment White Paper- AMWG Jan 2002]
*[http://www.nationalparkstraveler.com/2014/11/high-flows-through-grand-canyon-national-park-met-mixed-reactions25903 The United States Geological Survey estimates that the Colorado River below Glen Canyon Dam only has 6 percent of the sediment that it received before the Glen Canyon Dam was built in the 1960s.]

==Flash Flood videos==
*[https://www.youtube.com/watch?v=humwT6ivMt0 Paria River Flash Flood 8/3/16]
*[https://www.youtube.com/watch?v=sJBl6GXf_EA Buckskin Gulch Flash Flood 8/4/16]
*[https://www.youtube.com/watch?v=aZp_1KtrzjQ| Buckskin Wash Flash Flood / Debris Flow 2013]
*[https://www.youtube.com/watch?v=iAw_zIg9BqI Paria River Flash Flood / Debris Flow 8/19/12]
*[https://www.youtube.com/watch?v=580HhfKenws Glen Canyon and Page Arizona Flooding May 22 2009]
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Turbidity

2026-09-17T20:30:37Z

Cellsworth:

Turbidity

2026-09-17T20:28:44Z

Cellsworth:

GCDAMP Sediment

2026-09-17T19:54:58Z

Cellsworth:

----
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[[File:Paria at mainstem.jpg|center|thumbnail|400px|The Paria River flowing into the mainstem Colorado River‎]]<br>


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==[http://www.gcmrc.gov/research_areas/sediment_geomorphology/sed/Sed_Geomorph_Home_Page.aspx '''Sediment and Geomorphology''']==

Erosion of sandbars (beaches) along the Colorado River in Grand Canyon was first reported in the early 1970s, approximately 10 years after completion of Glen Canyon Dam. Since then, scientific studies have been conducted to monitor changes in sandbars and changes in the amount of sand stored on the bed of the river. One of the outcomes of these studies has been the implementation of flow experiments intended to rebuild eroded sandbars, especially by the release of controlled floods, also called [http://gcdamp.com/index.php?title=The_HFE_Page '''High Flow Experiments, or HFEs,'''] from Glen Canyon Dam. The sediment and geomorphology projects at Grand Canyon Monitoring and Research Center include the collection and processing of data to provide information needed to conduct controlled floods and to evaluate the outcome of each controlled flood and the long-term effects of controlled floods and normal dam operations on sediment-related resources. [https://www.gcmrc.gov/research_areas/sediment_geomorphology/sed/Sed_Geomorph_Home_Page.aspx]

Beginning in 1998, [http://gcdamp.com/index.php?title=RECREATION '''recreational campsite area'''] has also been measured on a subset of the sandbar monitoring sites. Campsite areas are defined as areas that are flat (less than 8 degree slope), smooth (not rocky), and clear of dense vegetation. Monitoring data show that vegetation expansion and sandbar erosion/deposition contribute to reductions in campsite area.

==[http://gcdamp.com/index.php?title=Long-term_Experimental_and_Management_Plan_(LTEMP) '''LTEMP Resource Goal''']==
Increase and retain fine sediment volume, area, and distribution in
the Glen, Marble, and Grand Canyon reaches above the elevation of the
average base flow for ecological, cultural, and recreational purposes.

==[http://gcdamp.com/index.php?title=Portal:Desired_Future_Conditions_-DFCs '''Desired Future Condition''']==
High elevation open riparian sediment deposits along the Colorado River in sufficient volume, area, and distribution so as to provide habitat to sustain native biota and desired ecosystem processes<br>
• Nearshore habitats for native fish<br>
• Marsh and riparian habitat for fish (food chain maintenance)<br>
• Cultural resource preservation<br>
• Maintenance of camping beaches<br>

==[[Media:USGS GCMRC Status of LTEMP Metrics Report Dec11 2025-508Comp.pdf| '''Metrics''']]==
Performance Metric:
*Sand Bar Volume (includes multiple “sub-metrics”, e.g., normalized sandbar volume by type, mean sand bar response to HFEs)

Surveillance Metrics:
*Sand Supply By River Segment (Sand Mass Balance)
*Silt & Clay Retention by River Segment (Turbidity)

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{| style="width:100%; height:50px" border=1px solid #ccc; background:#cedff2
! style="width=33%; background:#cedff2;" | [[TBD|---]]<br>
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{|width="100%" cellpadding="2" cellspacing="5" style="vertical-align:top; background:#f5faff;"
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; text-align:left; color:#000; padding:0.2em 0.4em;"> Sediment transport and river discharge </h2>
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When the discharge of the Colorado River was lower than about 9,000 ft3/s, sand accumulated in the reach in Marble and upper Grand Canyons. At discharges higher than about 9,000 ft3/s, however, sand-transport rates at the Grand Canyon gaging station generally equaled those at the Lees Ferry gaging station, and at discharges higher than about 16,000 ft3/s, sand-transport rates at the Grand Canyon gaging station generally either equaled or exceeded those at the Lees Ferry gaging station. Thus, at discharges greater than about 9,000 ft3/s, sand was either conveyed through or eroded from the reach in Marble and upper Grand Canyons.

As discharges less than 9,000 ft3/s became less common, the discharge of the river became progressively more conducive to the conveyance of sand through or the erosion of sand from Marble and upper Grand Canyons. [https://pubs.usgs.gov/pp/pp1677/pdf/pp1677.pdf]

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;"> How long is sand stored on the bed of the river? </h2>
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Bedrock-canyon rivers tend to be supply limited because they are efficient transporters of sediment and not because the upstream supply of sediment is small. Following episodic tributary floods that supply finer sand, sand migrates quickly downstream in the form of a wave in which large systematic changes in bed-sand grain size occur. The tributary fine-sediment (i.e., sand, silt, and clay) supply to the Colorado River in our study area is bimodal, with a clay primary mode and a sand-silt secondary mode. The tributary sand supply grades smoothly into the silt-and-clay supply such that the sand-size sediment comprises the coarser part of this secondary mode, which occurs in very fine sand (0.0625–0.125 mm) for the Paria River and in medium silt (0.0156–0.0312 mm) for the LCR. Both tributaries supply more silt and clay to the Colorado River than they do sand. During sediment years 1998–2017, silt and clay comprised 60.6% and 88.1% of the fine sediment supplied by the Paria River and LCR, respectively. Of the total amount of sand supplied since 2011, the Paria River has contributed 57%, the LCR has contributed 21%, and all other tributaries combined have contributed 22%. The largest quantities of sand are supplied by the Paria River and LCR during summer thunderstorm-generated floods that last hours to a day. Large sand loads are rare during winter and spring months on both rivers.

Our late-1990s observations suggested that tributary floods generated sand waves that split into two packets, A and B: packet A was finer than packet B and migrated downstream in the Colorado River with a celerity slightly slower than the water velocity. Packet B migrated much more slowly than packet A; the amalgamated front of packet B had migrated only ∼10 km in the 3 and 10 days after two Paria River floods. The primary peak in QSAND—1/βQ cross covariance decays to background within 7–20 days of a tributary flood at all but the RK49 station, thus indicating that much of packet A exits our study area quickly. The lower celerity of packet B causes the secondary cross-covariance peak to become distinct from the primary peak with increasing distance downstream. '''Following a Paria River flood, the secondary peak (packet B) separates from the primary peak (packet A) between the RK49 and RK99 stations, and it takes ∼198 and ∼290 days for the tail of packet B to respectively reach these stations. Following an LCR flood, packet B separates from packet A upstream from the RK141 station, and it takes ∼261 days for the tail of packet B to reach this station.''' [https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2020JF005565]

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;"> Updates </h2>
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[[File:SedimentSustainability.PNG|center|thumbnail|500px|https://www.usbr.gov/uc/progact/amp/twg/2022-01-13-twg-meeting/20220113-AnnualReportingMeeting-ProjectA-StreamflowWaterQualitySedimentTransportBudgetingColoradoRiverEcosystem-508-UCRO.pdf ]]

[[File:LongtermDecline.PNG|center|thumbnail|500px|https://www.usbr.gov/uc/progact/amp/twg/2022-01-13-twg-meeting/20220113-AnnualReportingMeeting-ProjectA-StreamflowWaterQualitySedimentTransportBudgetingColoradoRiverEcosystem-508-UCRO.pdf ]]

[[File:SandbarMonitoring2016.jpg|center|thumbnail|500px|[https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR3_Grams.pdf https://www.usbr.gov/uc/rm/amp/twg/mtgs/17jan26/AR3_Grams.pdf] ]]

[[File:2012 2014 HFE response.jpg|center|thumbnail|500px|[https://www.usbr.gov/uc/rm/amp/twg/mtgs/15jun11/Attach_02,.pdf https://www.usbr.gov/uc/rm/amp/twg/mtgs/15jun11/Attach_02,.pdf] ]]

[[File:2016 SedimentSummary.jpg|center|thumbnail|500px|[https://www.usbr.gov/uc/rm/amp/twg/mtgs/16jan26/documents/AR02_Grams.pdf https://www.usbr.gov/uc/rm/amp/twg/mtgs/16jan26/documents/AR02_Grams.pdf] ]]

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Links and Information</h2>
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*[http://gcdamp.com/index.php?title=Portal:GCDAMP_Knowlege_Assessments GCMRC Annual Reports page]
*[https://www.gcmrc.gov/sandbar/ GCMRC Grand Canyon Sandbar Monitoring]
*[http://gcdamp.com/index.php?title=The_HFE_Page The High Flow Experiment (HFE) Page]
*[http://gcdamp.com/index.php?title=RECREATION Recreation Page]
*[[Aeolian Sand Transport| Aeolian Sand Transport Page]]
*[http://gcdamp.com/index.php?title=Turbidity Turbidity Page]
*[http://gcdamp.com/index.php?title=GCDAMP-_Over-Flights Over Flights Page]

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! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">[https://www.gcmrc.gov/research_areas/sediment_geomorphology/sed/Sed_Geomorph_Home_Page.aspx Projects]</h2>
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*[https://www.gcmrc.gov/sandbar/ Sandbar Monitoring]
*[https://www.gcmrc.gov/research_areas/sediment_geomorphology/sed/Sed_Geomorph_Camp.aspx Campsite Monitoring]
*[https://www.gcmrc.gov/discharge_qw_sediment/ Suspended Sediment Transport ]
*[https://www.gcmrc.gov/research_areas/sediment_geomorphology/sed/Sed_Geomorph_Home_Page.aspx Automated Substrate Classification Using Swath Mapping Systems]
*[https://www.gcmrc.gov/research_areas/sediment_geomorphology/sed/Sed_Geomorph_storage.aspx Sediment Storage]
*[https://www.gcmrc.gov/research_areas/sediment_geomorphology/sed/Sed_Geomorph_Home_Page.aspx Underwater Photography to Measure Bed Grain Size ]

|-
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Sediment Gages</h2>
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*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-GCLT1 Water Holes Canyon above the mouth]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09381800 Paria River near Kanab, UT]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09382000 Paria River at Lees Ferry, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09380000 Colorado River at Lees Ferry]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT1 Badger Creek below highway 89A near Vermillion Cliffs, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT2 Tanner Wash below highway 89A near Bitter Springs, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT3 House Rock Wash above Emmett Wash near Cliff Dwellers, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT5 North Canyon near Cliff Dwellers, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT6 Shinumo Wash in Twentynine Mile Canyon near Cedar Ridge, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09383050 Colorado River near river mile 30]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09383100 Colorado River above Little Colorado River near Desert View, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401500 Moenkopi Wash near Cameron, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401000 Little Colorado River at Grand Falls, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09401200 Little Colorado River at Cameron, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402000 Little Colorado River near Cameron, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402300 Little Colorado River above the mouth near Desert View, AZ]
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402500 Colorado River near Grand Canyon, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09403000 Bright Angel Creek near Grand Canyon, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT6 Shinumo Creek]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09403850 Kanab Creek above the mouth near Supai, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404115 Havasu Creek above the mouth near Supai, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404120 Colorado River above National Canyon near Supai, AZ]
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404200 Colorado River above Diamond Creek near Peach Springs, AZ]

|-
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;">Sand Mass Balance Reaches in Grand Canyon </h2>
|-
|style="color:#000;"|
*[http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09380000/09383050 Upper Marble Canyon]
*[http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09383050/09383100 Lower Marble Canyon]
*[http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09383100/09402500 Eastern Grand Canyon]
*[http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09402500/09404120 East Central Grand Canyon]
*[http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09404120/09404200 West Central Grand Canyon]
*[http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09404200/Pearce%20Ferry Western Grand Canyon and the Lake Mead Delta]

|-
! <h2 style="margin:0; background:#cedff2; font-size:120%; font-weight:bold; border:1px solid #a3b0bf; text-align:left; color:#000; padding:0.2em 0.4em;"> Presentations and Papers </h2>
|-
|style="color:#000;"|

'''2026'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2026-02-26-amwg-meeting/uc-gcdamp-amwg-interdisciplinarysediment-508-20260226.pdf Interdisciplinary Sediment, Riparian Vegetation, and Cultural Resource Science]
*[https://www.usbr.gov/uc/progact/amp/amwg/2026-02-26-amwg-meeting/uc-gcdamp-amwg-ltempsandmanagement-508-20260226.pdf Evaluation of LTEMP sand management]
*[https://www.usbr.gov/uc/progact/amp/twg/2026-02-05-twg-meeting/uc-gcdamp-arm-riverbed-sandbarresponse-508-20260205.pdf Riverbed and Sandbar Response to Glen Canyon Dam Operations and High-Flow Experiments]
*[https://www.usbr.gov/uc/progact/amp/twg/2026-02-05-twg-meeting/uc-gcdamp-arm-evaluationsandmanagement-508-20260205.pdf Evaluation of LTEMP sand management]
*[https://www.usbr.gov/uc/progact/amp/twg/2026-02-05-twg-meeting/uc-gcdamp-arm-sandmanagement-508-20260205.pdf Reservoir Operational Strategies for Sustainable Sand Management in the Colorado River]

'''2025'''
*[https://www.usbr.gov/uc/progact/amp/twg/2025-04-10-twg-meeting/uc-gcdamp-twg-arm-goal7metrics-508-20250410.pdf Goal 7 Metrics: Sediment]
*[https://www.usbr.gov/uc/progact/amp/twg/2025-04-10-twg-meeting/uc-gcdamp-twg-arm-projecta-508-20250410.pdf Project A: Streamflow, Water Quality, and Sediment Transport and Budgeting in the Colorado River Ecosystem]

'''2024'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2024-02-29-amwg-meeting/20240229-ProjectB-UpdateRiverbedSandbarResponseDamOperationsHFE-508-UCRO.pdf Project B Update and Riverbed and sandbar response to dam operations and high-flow experiments ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2024-02-29-amwg-meeting/20240229-ProjectA-StreamflowWaterQualitySedimentTransportBudgetingColoradoRiverEcosystem-508-UCRO.pdf Project A: Streamflow, Water Quality, and Sediment Transport and Budgeting in the Colorado River Ecosystem ]
*[https://www.usbr.gov/uc/progact/amp/twg/2024-01-25-twg-meeting/20240125-AnnualReportingMeeting-EffectsDamOperationsVegetationManagementPreservationGeomorphicConditionArchaeologicalSites-508-UCRO.pdf Effects of Reservoirs and Stock Ponds on Surface Water Runoff in the Little Colorado River Basin ]
*[[Media:Sartain_AGU2023_poster_ARM.pdf| Assessing geomorphic change for 454 river km of the Colorado River in Grand Canyon, AZ via continuous and high-resolution water surface and bed profiles
]]
*[[Media:Kaplinski_Glen_canyon_flow_model_poster_20240114.pdf| Hydrodynamic modeling of the Colorado River between Glen Canyon Dam and Lees Ferry, Arizona]]

'''2024'''
*[https://doi.org/10.3133/ofr20231093 Griffiths et al., 2024, Changes in sand storage in the Colorado River in Grand Canyon National Park from July 2017 through June 2020]
*[https://www.usbr.gov/uc/progact/amp/twg/2024-01-25-twg-meeting/20240125-AnnualReportingMeeting-ChannelResponseHighFlowsWesternGrandCanyon-508-UCRO.pdf Channel Response to High Flows in Western Grand Canyon ]
*[https://www.usbr.gov/uc/progact/amp/twg/2024-01-25-twg-meeting/20240125-AnnualReportingMeeting-ProjectAStreamflowWaterQualitySedimentTransportBudgetingColoradoRiverEcosystem-508-UCRO.pdf Project A: Streamflow, Water Quality, and Sediment Transport and Budgeting in the Colorado River Ecosystem ]
*[https://www.usbr.gov/uc/progact/amp/twg.html#:~:text=Project%20B%20Update%20and%20Riverbed%20and%20sandbar%20response%20to%20dam%20operations%20and%20high%2Dflow%20experiments Project B Update and Riverbed and sandbar response to dam operations and high-flow experiments ]

'''2023'''
*[https://www.usbr.gov/uc/progact/amp/twg/2023-01-26-twg-meeting/20230126-AnnualReportingMeeting-AContinuousHigh-ResolutionProfileRiverbedWaterSurface460-kmColoradoRiverGrandCanyon-508-UCRO.pdf A Continuous High-Resolution Profile of the Riverbed and Water Surface for 460-km of the Colorado River in Grand Canyon]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-01-26-twg-meeting/20230126-AnnualReportingMeeting-StreamflowSedimentVegetationDynamics-508-UCRO.pdf Project A: Streamflow, Sediment, and Vegetation Dynamics; Implications for Geomorphic Change in the Colorado River and its Tributaries]
*[https://www.usbr.gov/uc/progact/amp/twg/2023-01-26-twg-meeting/20230126-AnnualReportingMeeting-StreamflowWaterQualitySedimentTransportBudgetingColoradoRiverEcosystem-508-UCRO.pdf Project A: Streamflow, Water Quality, and Sediment Transport and Budgeting in the Colorado River Ecosystem]
*[[Media:ARM_salter.pdf| Numerical Modeling of Mud Transport, Storage, and Release on the Colorado River, Arizona]]

'''2022'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-08-18-amwg-meeting/20220818-Grams_Sandbars_AMWG_BAO_508.pdf Multi-Decadal Sandbar Response to Flow Management Downstream from a Large Dam-The Glen Canyon Dam on the Colorado River in Marble and Grand Canyons, AZ ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2022-02-10-amwg-meeting/20220210-SummarySedimentSandbarProjects-508-UCRO.pdf Summary of Sediment and Sandbar Projects GCMRC Projects A and B LTEMP Goal 7 ]
*[https://www.usbr.gov/uc/progact/amp/twg/2022-01-13-twg-meeting/20220113-AnnualReportingMeeting-ProjectA-StreamflowWaterQualitySedimentTransportBudgetingColoradoRiverEcosystem-508-UCRO.pdf Project A: Streamflow, Water Quality, and Sediment Transport and Budgeting in the Colorado River Ecosystem ]

'''2021'''
*[[Media:Glen Canyon Sand Augmentation White Paper.pdf| Argonne. 2021. Evaluation of Sand Augmentation for Stabilizing Recreational Beaches and Storing Sand in Glen Canyon National Recreation Area]]
*[https://www.usbr.gov/uc/progact/amp/twg/2021-10-14-twg-meeting/20211014-MorphodynamicModelEvaluateSandbarRebuilding-Presentation-508-UCRO.pdf A simple morphodynamic model to rapidly evaluate sandbar rebuilding during controlled floods]
*[https://doi.org/10.1029/2020JF005565 Topping et al. 2021, Self-limitation of sand storage in a bedrock-canyon river arising from the interaction of flow and grain size: Journal of Geophysical Research: Earth Surface]
*[https://doi.org/10.1029/2021JF006149 Alvarez et al. 2021, An eddy-resolving numerical model to study turbulent flow, sediment, and bed evolution using detached eddy simulation in a lateral separation zone at the field-scale: Journal of Geophysical Research—Earth Surface]
*[https://www.usbr.gov/uc/progact/amp/amwg/2021-02-11-amwg-meeting/20210211-SandSupplyTransportDeposition-508-UCRO.pdf Sand Supply, Transport and Deposition ]

'''2020'''
*[https://doi.org/10.1029/2019JF005226 Rubin et al., 2020, Causes of variability in suspended‐sand concentration evaluated using measurements in the Colorado River in Grand Canyon: JGR Earth Surface]
*[https://www.usbr.gov/uc/progact/amp/amwg/2020-02-12-amwg-meeting/20200212-GCMRCScienceUpdatesPart3-Presentation-508-UCRO.pdf GCMRC 2019 Annual Reporting Meeting Overview – Part 3 ]
*[https://doi.org/10.1130/B35642.1 Chapman et al., 2020, Estimating the contribution of tributary sand inputs to controlled flood deposits for sandbar restoration using elemental tracers, Colorado River, Grand Canyon National Park, Arizona: GSA Bulletin] [https://doi.org/10.5066/P9C0IN56 Associated data]
*[https://www.usbr.gov/uc/progact/amp/twg/2020-01-13-twg-meeting/20200113-AnnualReportingMeeting-ProjectBEffectsDamReleaseSedimentStorageSandbarDynamics-Presentation-508-UCRO.pdf Project B: Effects of dam releases on in-channel sediment storage and sandbar dynamics ]
*[https://doi.org/10.1029/2019WR025883 Ashley et al., 2020, Estimating bedload from suspended load and water discharge in sand bed rivers: Water Resources Research.]
*[https://www.usbr.gov/uc/progact/amp/twg/2020-01-13-twg-meeting/20200113-AnnualReportingMeeting-GeomorphicChangeBiogeomorphicFeedbacksLittleColoradoRiver-Presentation-508-UCRO.pdf Geomorphic Change and Biogeomorphic Feedbacks in the Little Colorado River, Arizona ]

'''2019'''
*[https://doi.org/10.1130/B35047.1 Dean, D.J., and Topping, D.J., 2019, Geomorphic change and biogeomorphic feedbacks in a dryland river--The Little Colorado River, Arizona, USA: GSA Bulletin ]

'''2018'''
*[https://qcnr.usu.edu/wats/colorado_river_studies/files/documents/Rubin.pdf Sand tells a story]
*[https://doi.org/10.5066/P99TN424 Sankey et al., 2018, Sand classifications along the Colorado River in Grand Canyon derived from 2002, 2009, and 2013 high-resolution multispectral airborne imagery: U.S. Geological Survey data release]
*[https://www.usbr.gov/uc/progact/amp/amwg/2018-08-22-amwg-meeting/Attach_12.pdf GCMRC Science Updates PPT]
*[https://doi.org/10.1002/rra.3349 Hadley et al., 2018, Quantifying geomorphic and vegetation change at sandbar campsites in response to flow regulation and controlled floods, Grand Canyon National Park, Arizona: River Research and Applications]
*[https://www.usbr.gov/uc/progact/amp/twg/2018-01-25-twg-meeting/AR02.pdf Key drivers of sand transport and storage in the Colorado River Ecosystem PPT]
*[https://doi.org/10.5194/hess-22-1767-2018 Voichick, N. et al., 2018, Technical note--False low turbidity readings during high suspended-sediment concentrations: Hydrology and Earth System Sciences]
*[https://doi.org/10.3133/ofr20181019 Grams et al., 2018, Automated remote cameras for monitoring alluvial sandbars on the Colorado River in Grand Canyon, Arizona: Open-File Report]

'''2017'''
*[[Media:Chapman 2017 Thesis-Determining tributary sediment exp flood deposits Marble Canyon ColRiv.pdf| Chapman, K., 2017, Determining the tributary sediment contribution to experimental flood deposits on the Colorado River in Marble Canyon, Grand Canyon, Arizona: Flagstaff, Northern Arizona University, MS thesis]]
*[https://digitalcommons.usu.edu/etd/6635 Hamill, D., 2017, Quantifying riverbed sediment using recreational-grade side scan sonar: Logan, Utah State University, MS thesis]
*[http://dx.doi.org/10.1002/2017JF004302 Buscombe et al., 2017, Compositional signatures in acoustic backscatter over vegetated and unvegetated mixed sand-gravel riverbeds: Journal of Geophysical Research: Earth Surface]
*[https://doi.org/10.1016/j.geomorph.2017.08.037 Griffiths and Topping, 2017, Importance of measuring discharge and sediment transport in lesser tributaries when closing sediment budgets: Geomorphology]
*[https://doi.org/10.3133/ofr20171030 Kaplinski et al. 2017. Channel mapping river miles 29–62 of the Colorado River in Grand Canyon National Park, Arizona, May 2009: U.S. Geological Survey Open-File Report 2017–1030]
*[https://www.usbr.gov/uc/progact/amp/twg/2017-01-26-twg-meeting/AR1_Topping.pdf Project 1: Streamflow, Water Quality, Sediment Transport, and Sand Budgets in the Colorado River Ecosystem ]
*[https://www.usbr.gov/uc/progact/amp/twg/2017-01-26-twg-meeting/AR2_Dean.pdf Project 2: Hydrologic Change and the Geomorphic Transformation of the Little Colorado River: Implications for Sediment Delivery to the Grand Canyon ]
*[https://www.usbr.gov/uc/progact/amp/twg/2017-01-26-twg-meeting/AR3_Grams.pdf Sandbars and Sediment Storage in Marble and Grand Canyons: Response to Recent High-flow Experiments and Long-term Trends ]

'''2016'''
*[https://pubs.er.usgs.gov/publication/pp1823 Topping et al. 2016. Long-term continuous acoustical suspended-sediment measurements in rivers — Theory, application, bias, and error: U.S. Geological Survey Professional Paper 1823]
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-08-24-amwg-meeting/Attach_11a.pdf Sandbar Modeling Project Update]
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-08-24-amwg-meeting/Attach_07b.pdf Status of Sediment Resources – August 2016]
*[https://www.usbr.gov/uc/progact/amp/amwg/2016-08-24-amwg-meeting/Attach_07a.pdf Grand Canyon Monitoring and Research Center Science Updates and PPT (BO Compliance, Trout Updates, Green Sunfish, Fisheries PEP, Partners in Science)]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/AR03_Buscombe.pdf Observations of sand dune migration on the Colorado River in Grand Canyon using high-resolution multibeam bathymetry]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/AR01_Topping.pdf Project 2: Streamflow, Water Quality, Sediment Transport, and Sand Budgets in the Colorado River Ecosystem]
*[https://www.usbr.gov/uc/progact/amp/twg/2016-02-26-twg-meeting/AR02_Grams.pdf Sandbars and Sediment Storage in Marble and Grand Canyons: Response to Recent high-flow Experiments and Long-Term Trends]

'''2015'''
*[https://eos.org/features/building-sandbars-in-the-grand-canyon Grams et al. 2015. Building Sandbars in the Grand Canyon, EOS, Trans. Am. Geophys. Union]
*[http://repository.asu.edu/items/30069 Alvarez. 2015. Turbulence, Sediment Transport, Erosion, and Sandbar Beach Failure Processes in Grand Canyon. Ph.D. Dissertation, Arizona State University, Tempe, AZ]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGeUVIWEwyY1l6RUE/view GCMRC Science Update - Sediment]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-06-11-twg-meeting/Attach_02,.pdf GCMRC Science Update - Sediment]
*[https://drive.google.com/file/d/0BwY-Z2c3NTUGQURtV2s3eWJqRHM/view Updates on 2014 HFE, Paria sediment inputs, and sediment mass balance]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-04-21-twg-meeting/Attach_11.pdf Glen Canyon Tailwater Fishery “Integrating Fish and Channel Mapping”]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-04-21-twg-meeting/Attach_13.pdf GCMRC’s Online Mapping and GIS Resources]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-01-20-twg-meeting/Attach_01.pdf Streamflow, Water Quality, and Sediment Transport in the Colorado River Ecosystem]
*[https://www.usbr.gov/uc/progact/amp/twg/2015-01-20-twg-meeting/Attach_02.pdf Sandbars and Sediment Storage in Marble and Grand Canyons: Response to Recent High-flow Experiments and Long-term Trends]

'''2014'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-08-27-amwg-meeting/Attach_04a.pdf Science Updates - Recent Research on Sand, Bugs, and Fish ]
*[https://www.usbr.gov/uc/progact/amp/twg/2014-01-30-twg-meeting/AR_Grams_Sandbar_Storage.pdf Sandbars and Sand Storage in Marble and Grand Canyons (Grams) ]
*[https://www.usbr.gov/uc/progact/amp/twg/2014-01-30-twg-meeting/AR_Griffiths_Processing.pdf Processing fine sediment transport data: procedures, processing, and bottlenecks (Griffiths) ]

'''2013'''
*[https://asu.pure.elsevier.com/en/publications/erosion-of-river-sandbars-by-diurnal-stage-fluctuations-in-the-co Alvarez and Schmeeckle. 2013. Erosion of river sandbars by diurnal stage fluctuations in the Colorado river in the Marble and Grand Canyons: Full-scale laboratory experiments]
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/13nov06/Attach_02a.pdf GCMRC Update - Status of Resources and Sediment Conditions]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-08-08-amwg-meeting/Attach_06d.pdf Present Status of Sediment Resources-August 2013]
*[https://www.usbr.gov/uc/progact/amp/amwg/2013-08-08-amwg-meeting/Attach_06a.pdf Science Updates - Overflights, Riparian Vegetation, and Sediment]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-06-26-twg-meeting/Attach_07a.pdf 2013 Overflight Wrap up]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-06-26-twg-meeting/Attach_07b.pdf GCMRC Science Update on Sediment and Fisheries]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-01-24-twg-meeting/15_Topping.pdf Sediment Monitoring Program: Sediment Delivery from Tributaries and Sediment Transport by Colorado River]
*[https://www.usbr.gov/uc/progact/amp/twg/2013-01-24-twg-meeting/16_Grams.pdf Sandbar Monitoring for November 2012 Controlled Flood]

'''2012'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-08-29-amwg-meeting/Attach_04a.pdf GCMRC Updates and Sediment Update ]
*[https://www.usbr.gov/uc/progact/amp/twg/2012-06-20-twg-meeting/Attach_09.pdf E-mail to TWG with Sediment Model Link]
*[https://www.usbr.gov/uc/progact/amp/amwg/2012-02-22-amwg-meeting/Attach_08.pdf GCMRC Updates and PPT]
*[https://www.gcmrc.gov/about/ka/KA%202%20-%201-31-12/PM%20Talks/Grams%200400-0500.pdf Sandbars and In-Channel Sand Storage: Short-Term Dynamics and Long-Term Trends ]
*[https://www.gcmrc.gov/about/ka/KA%202%20-%201-31-12/PM%20Talks/Topping%200200-0300.pdf Physical controls on sediment deposition, erosion, and transport ]
*[https://www.gcmrc.gov/about/ka/KA%202%20-%201-31-12/PM%20Talks/Melis%200300-0400.pdf Geomorphic Framework & Role of Debris Flows Suspended-Sediment Transport and Sandbars Glen Canyon Dam Operations -Post-EIS Summary ]
*[https://www.gcmrc.gov/about/ka/KA%202%20-%201-31-12/PM%20Talks/Schmidt%200100-0200.pdf A Conversation about Rivers and Dams ]
*[https://www.gcmrc.gov/about/ka/KA%202%20-%202-1-12/PM%20Talks/Wright%200200-0300%20Modeling%20101.pdf Modeling 101 ]

'''2011'''
*[https://www.usbr.gov/uc/progact/amp/amwg/2011-08-24-amwg-meeting/Attach_06.pdf GCMRC Updates]
*[https://www.usbr.gov/uc/progact/amp/twg/2011-06-28-twg-meeting/Attach_05.pdf Update on Sand Mass Balance with Modeling]

'''2010'''
*[https://pubs.usgs.gov/of/2010/1133/OFR_2010-1133.pdf Wright, S.A., and Grams, P.E., 2010, Evaluation of Water Year 2011 Glen Canyon Dam flow release scenarios on downstream sand storage along the Colorado River in Arizona: U.S. Geological Survey Open-File Report 2010-1133]
*[https://www.usbr.gov/uc/progact/amp/twg/2010-11-15-twg-meeting/Attach_11d.pdf Update on Water Quality and 2010 Sand Input ]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_03a.pdf Grand Canyon Monitoring and Research Updates and the Following Open File Reports: 1) Evaluation of Water Year 2011 Glen Canyon Dam Flow Release Scenarios on Downstream Sand Storage Along the Colorado River in Arizona, and 2) An Approach to Modeling Sediment Budgets in Supply-limited Rivers]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_03b.pdf Report on Sediment Modeling to Support Development of 2011 Hydrograph]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_03c.pdf Update on 2010 Sediment Inputs]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_12a.pdf Temperature Control Device and Sediment Augmentation Report]
*[https://www.usbr.gov/uc/progact/amp/amwg/2010-08-24-amwg-meeting/Attach_12b.pdf TWG Chair Temperature Control Device/Sediment Augmentation]
*[https://www.usbr.gov/uc/progact/amp/twg/2010-06-29-twg-meeting/Attach_01b.pdf Minutes from June 21, 2010, TWG Webinar/Conference Call with Memo from John Hamill to Shane Capron dated May 17, 2010, Subject: TWG and stakeholder requests for GCMRC to evaluate the effects of various dam operation scenarios on sediment storage and loss in the Grand Canyon with Open File Report 2010-1133]
*[https://www.usbr.gov/uc/progact/amp/twg/2010-06-29-twg-meeting/Attach_10.pdf Mechanics and Modeling of Flow, Sediment Transport and Morphologic Change in Riverine Lateral Separation Zones]
*[https://www.usbr.gov/uc/progact/amp/twg/2010-03-15-twg-meeting/Attach_07.pdf Sediment and Temperature Modeling Update PPT as presented at January 2010 Annual Reporting Meeting]
*[https://www.usbr.gov/uc/progact/amp/twg/2010-01-21-twg-meeting/Attach_07.pdf AIF: Temperature Control Device and Sediment Augmentation and PPT]

'''2009'''
*[https://www.usbr.gov/uc/progact/amp/twg/2009-09-29-twg-meeting/Attach_14.pdf Selective Withdrawal and Sediment Augmentation Update PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2009-09-29-twg-meeting/Attach_06.pdf Grand Canyon Monitoring and Research Center Updates]
*[https://www.usbr.gov/uc/progact/amp/twg/2009-06-22-twg-meeting/Attach_04.pdf Sandbar Evolution: Extending the Historical Perspective PPT]
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-04-29-amwg-meeting/Attach_03a.pdf AIF: Grand Canyon Monitoring and Research Center (GCMRC) Update]
*[https://www.usbr.gov/uc/progact/amp/amwg/2009-04-29-amwg-meeting/Attach_03d.pdf Water Quality and Sediment, 2008 High Flow Experiment, and Integrated Flow, Temperature, and Sediment Modeling PPT]
*[https://www.usbr.gov/uc/progact/amp/twg/2009-03-16-twg-meeting/Attach_05.pdf Grand Canyon Monitoring and Research Center updates by Program Managers]
*[https://www.usbr.gov/uc/progact/amp/twg/2009-03-16-twg-meeting/Attach_10.pdf Diamond Creek Gage Discontinuation]

'''2008'''
*[http://www.riversimulator.org/Resources/Hydrology/WrightGSA2008.pdf Is there enough sand? Evaluating the fate of Grand Canyon sandbars]

'''2003'''
*[https://pubs.usgs.gov/pp/pp1677/pdf/pp1677.pdf Topping et al. 2003. Computation and analysis of the instantaneous-discharge record for the Colorado River at Lees Ferry, Arizona, May 8, 1921 through September 30, 2000: U.S. Geological Survey Professional Paper 1677]

'''1999'''
*[https://www.usbr.gov/uc/rm/amp/twg/mtgs/10jun29/Attach_11.pdf Floods and Sandbars in the Grand Canyon, a publication of the Geological Society of America (published in GSA Today, April 1999)]

'''1988'''
*[https://pubs.usgs.gov/of/1987/0561/report.pdf Schmidt and Graf, 1988, Aggradation and degradation of alluvial sand deposits, 1965 to 1986, OFR 87-561]

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*Eddies occur adjacent to rapids and the flow in the eddy is related to the flow characteristics in the rapid. Sand bars were typically larger before the dam.(Science Background for HFE Planning- Jack Schmidt, GCMRC_KA 2013)
*[http://www.usbr.gov/uc/rm/amp/amwg/mtgs/02jan17/Attach_10b.pdf Sediment Presentation- AMWG Jan 2002]
*[http://www.usbr.gov/uc/rm/amp/amwg/mtgs/02jan17/Attach_10a.pdf Sediment White Paper- AMWG Jan 2002]
*[http://www.nationalparkstraveler.com/2014/11/high-flows-through-grand-canyon-national-park-met-mixed-reactions25903 The United States Geological Survey estimates that the Colorado River below Glen Canyon Dam only has 6 percent of the sediment that it received before the Glen Canyon Dam was built in the 1960s.]

==Flash Flood videos==
*[https://www.youtube.com/watch?v=humwT6ivMt0 Paria River Flash Flood 8/3/16]
*[https://www.youtube.com/watch?v=sJBl6GXf_EA Buckskin Gulch Flash Flood 8/4/16]
*[https://www.youtube.com/watch?v=aZp_1KtrzjQ| Buckskin Wash Flash Flood / Debris Flow 2013]
*[https://www.youtube.com/watch?v=iAw_zIg9BqI Paria River Flash Flood / Debris Flow 8/19/12]
*[https://www.youtube.com/watch?v=580HhfKenws Glen Canyon and Page Arizona Flooding May 22 2009]
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GCDAMP Planning

2026-09-17T19:52:27Z

Cellsworth:

Turbidity

2026-09-17T19:48:34Z

Cellsworth:

Turbidity

2026-09-17T19:11:36Z

Cellsworth:

2027-2028 Operating Guidelines

2026-09-11T17:26:33Z

Cellsworth: