Difference between revisions of "Hydrology"

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-----------'''Welcome to the ENERGY SERVICES GROUP HOME PAGE'''---------->
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==[http://www.usbr.gov/uc/water/crsp/cs/gcd.html '''Current Status''']==
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=='''Upper Colorado River Basin Hydrology'''==
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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]
−
The unregulated inflow volume to Lake Powell in May was 2,294 thousand acre-feet (kaf) (98 percent of average). The release volume from Glen Canyon Dam in May was 700 kaf.  The end of May elevation and storage of Lake Powell were 3,604 ft (96 feet from full pool) and 12.1 maf (50% of full capacity), respectively.  The reservoir reached a seasonal low elevation on April 15th near elevation 3591.14 feet. Since that time the reservoir elevation has been increasing and will continue to increase throughout mid-summer as runoff from snowmelt and precipitation enter the reservoir.
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==[http://www.usbr.gov/uc/water/crsp/cs/gcd.html '''Inflow Forecasts and Model Projections''']==
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−
The operating tier for water year 2016 was established in August 2015 as the Upper Elevation Balancing Tier.  The April 2016 24-Month Study established that Lake Powell operations will be governed by balancing for the remainder of water year 2016. Under balancing, the contents of Lake Powell and Lake Mead will be balanced by the end of the water year, but not more than 9.0 maf and not less than 8.23 maf shall be released from Lake Powell.  Based on the most probable inflow forecast, this June 24-Month Study projects a balancing release of 9.0 maf in water year 2016; the actual release in water year 2016, however, will depend on hydrology in the remainder of water year and will range from 8.23 to 9.0 maf.  The projected release from Lake Powell in water year 2016 will be updated each month throughout the remainder of the water year.  Reclamation will schedule operations at Glen Canyon Dam to achieve as practicably as possible the appropriate total annual release volume by September 30, 2016.
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In June, the release volume will be approximately 800 kaf, with fluctuations anticipated between about 9,000 cfs in the nighttime to about 17,000 cfs in the daytime and consistent with the Glen Canyon Operating Criteria (Federal Register, Volume 62, No. 41, March 3, 1997). The anticipated release volume for July is 950 kaf with daily fluctuations between approximately 11,500 cfs and 19,500 cfs. The expected release for August is 900 kaf with daily fluctuations between approximately 10,000 cfs and 18,000 cfs.
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! style="width=33%; background:#cedff2;" | [[Table- Hydrology of the Colorado River]]<br>
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! style="width=33%; background:#cedff2;" | [http://www.usbr.gov/uc/water/crsp/cs/gcd.html Current Status] <br>  
−
! style="width=33%; background:#cedff2;" | [[TBD|---]]
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! style="width=33%; background:#cedff2;" | [http://www.usbr.gov/uc/water/crsp/cs/gcd.html Current Operations] <br>
−
! style="width=33%; background:#cedff2;" | [[TBD|---]]
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! 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;">Reservoir Elevations</h2>
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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;"|
 
|style="color:#000;"|
  
−
[[File:2016 PowellElevations.jpg|400px]]
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=='''[https://www.usbr.gov/uc/index.html Upper Colorado Region Homepage]'''==
−
[[File:2016 MeadElevations.jpg|400px]]
+
*[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
  
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|-
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*[http://www.usbr.gov/lc/region/g4000/weekly.pdf Lower Colorado Water Supply Report]
−
! <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;">Inflows to Lake Powell</h2>
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#Water use
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|style="color:#000;"|
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−
[[File:2016 LakePowellInflow.jpg|400px]]
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*[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]
  
−
== '''USBR Weekly Water Report''' ==
+
#[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]
  
−
* [http://www.usbr.gov/lc/region/g4000/weekly.pdf USBR Water Report]
+
*[https://www.usbr.gov/uc/water/rsvrs/ops/monthly_summaries/index.html Monthly Summaries]
−
* [http://www.usbr.gov/lc/region/g4000/hourly/forecast09.pdf USBR -LC Region Hourly Forecasts]
+
*[https://www.usbr.gov/uc/water/rsvrs/ops/aop/index.html Annual Operating Plans for Colorado River reservoirs]
−
* [http://www.usbr.gov/lc/region/g4000/wtracct.html USBR- Historic Use Records Water Accounting Reports''']
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== '''Snow Pack Reports''' ==
 
== '''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.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]
 
*[http://www.cbrfc.noaa.gov/snow/station/sweplot/sweplot.cgi?quick=multiple SNOWTEL Report]
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**Select the report under "Public", listed as "Colorado River above Lake Powell" (116 snowtel sites).   
 
**Select the report under "Public", listed as "Colorado River above Lake Powell" (116 snowtel sites).   
 
**Data source is updated at least daily.
 
**Data source is updated at least daily.
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== '''U.S. Drought Monitor''' ==
 
== '''U.S. Drought Monitor''' ==
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*[http://treeflow.info/basin.html Tree Flow Data]
 
*[http://treeflow.info/basin.html Tree Flow Data]
  
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==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;"
 +
|-
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!Water Year
 +
![https://www.usbr.gov/lc/region/g4000/NaturalFlow/provisional.html Naturalized Flow at Lees Ferry (maf)]
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![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||
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|-
 +
|2008||16.21||12.086||08.978||09.180||
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|-
 +
|2007||12.56||08.754||08.231||08.421||
 +
|-
 +
|2006||12.61||08.626||08.228||08.507||
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|-
 +
|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||
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|-
 +
|1996||14.07||10.402||11.522||11.532||
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|-
 +
|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||
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|-
 +
|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||
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|-
 +
|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]]
  
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[[File:WaterUse.png|center|600px]]
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|}
  
 
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{| width="100%" cellpadding="2" cellspacing="5" style="vertical-align:top; background:#f5faff;"
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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;">Water Flow Gages</h2>
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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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|style="color:#000;"|
 +
 
*[http://graphs.water-data.com/lakepowell/ Lake Powell Water Level Graphs]
 
*[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]
 
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09380000 Colorado River at Lees Ferry]
−
*[http://waterdata.usgs.gov/ut/nwis/uv/?site_no=09381800&PARAmeter_cd=00065,00060,72020,00010,00095,00300,63680 Paria River near Kanab (US 89 bridge)]
+
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09381800 Paria River near Kanab, UT]
−
*[http://waterdata.usgs.gov/az/nwis/uv?site_no=09382000 Paria River at Lees Ferry]
+
*[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/09383050 Colorado River at 30 mile]
+
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT1 Badger Creek below highway 89A near Vermillion Cliffs, AZ]
−
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09383100 Colorado River above LCR]
+
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT2 Tanner Wash below highway 89A near Bitter Springs, AZ]
−
*[http://waterdata.usgs.gov/az/nwis/uv?site_no=09402300 LCR at Colorado River]
+
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT3 House Rock Wash above Emmett Wash near Cliff Dwellers, AZ]
−
*[http://waterdata.usgs.gov/az/nwis/uv?site_no=09402500 Colorado River at Bright Angel Creek]
+
*[https://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/GCMRC-MCLT5 North Canyon near Cliff Dwellers, AZ]
−
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09403000 Bright Angel Creek]
+
*[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/GCMRC-MCLT6 Shinumo Creek]
−
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09402352 Colorado River abv Lava Canyon rm66]
+
*[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/09403270 Colorado River bl rm127]
+
*[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/09403850 Kanab Creek]
+
*[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/09404115 Havasu Creek]
+
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404200 Colorado River above Diamond Creek near Peach Springs, AZ]
−
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404120 Colorado River abv National Canyon]
+
−
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404200 Colorado River bl Diamond Creek]
+
−
*[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09404220 Colorado River abv Spencer rm246]
+
 
*[http://graphs.water-data.com/lakemead/ Lake Mead Water Level Graphs]
 
*[http://graphs.water-data.com/lakemead/ Lake Mead Water Level Graphs]
−
 
−
 
  
 
|-
 
|-
Line 125: Line 279:
 
|-
 
|-
 
|style="color:#000;"|
 
|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'''
 
'''2016'''
−
*[http://www.usbr.gov/uc/rm/amp/amwg/mtgs/16aug24/Attach_05.pdf Basin Hydrology and Water Year (WY) 2017 Hydrograph]
+
*[[Media:Aug2016 Information.pdf| August 2016 DOI-DOE Federal Family call on Glen Canyon Operations ]]
−
*[http://www.usbr.gov/uc/rm/amp/amwg/mtgs/16may25/Attach_02.pdf Basin Hydrology, Operations, and 2017 Hydrograph]
+
*[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]]
 
*[[Media:2017 Hydrology PPT.pdf| TWG: Basin Hydrology, Operations, and 2017 Hydrograph]]
−
*[http://www.usbr.gov/uc/rm/amp/amwg/mtgs/16feb24/pdf/Attach_08.pdf AMWG: 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]
−
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/16jan26/documents/Attach_02.pdf Glen Canyon Dam Operations During Equalization]
+
*[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'''
 
'''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-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-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-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://drive.google.com/file/d/0BwY-Z2c3NTUGbmRuSzRqVm5ydHc/view Basin Hydrology Operations, and 2016 Hydrograph]
−
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/15jun11/Attach_04.pdf 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://drive.google.com/file/d/0BwY-Z2c3NTUGMHhacTF4enJ1eGs/view 2016 Annual Operating Plan]
−
*[http://www.usbr.gov/uc/rm/amp/amwg/mtgs/15may28/Attach_05.pdf AMWG: Basin Hydrology and WY 2016 Hydrograph]
+
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-05-28-amwg-meeting/Attach_05.pdf Basin Hydrology and WY 2016 Hydrograph]
−
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/15apr21/Attach_03.pdf TWG: Hydrology Update and 2016 Hydrograph]
+
*[https://www.usbr.gov/uc/progact/amp/twg/2015-04-21-twg-meeting/Attach_03.pdf Hydrology Update and 2016 Hydrograph]
−
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/15apr21/Attach_07.pdf Water Quality in Lake Mead and Upstream Influences: Dissolved Oxygen during 2014]  
+
*[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]  
−
*[http://www.usbr.gov/uc/rm/amp/amwg/mtgs/15feb25/Attach_02.pdf Basin Hydrology, Operations, and 2016 Hydrograph]  
+
*[https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_02.pdf Basin Hydrology, Operations, and 2016 Hydrograph]  
−
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/14jun24/Attach_06b.pdf Hydrology Update 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'''
 
'''2014'''
−
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/14jun24/Attach_06a.pdf| Basin Hydrology, Operations, and 2015 Hydrograph ]  
+
*[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 ]
−
*[http://www.usbr.gov/uc/rm/amp/twg/mtgs/14jun24/Attach_06a.pdf| Proposed 2015 Hydrograph ]  
+
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-08-27-amwg-meeting/Attach_02b.pdf DOI-DOE Hydrograph Development for Water Year 2015  ]
−
*[http://www.usbr.gov/uc/rm/amp/amwg/mtgs/14aug27/Attach_02a.pdf| Basin Hydrology, Operations ]  
+
*[https://www.usbr.gov/uc/progact/amp/amwg/2014-08-27-amwg-meeting/Attach_02a.pdf Basin Hydrology, Operations ]  
−
*[http://www.usbr.gov/uc/rm/amp/amwg/mtgs/14may27/Attach_01.pdf| Basin Hydrology, Operations, and 2015 Hydrograph and AIF: Development of Water Year 2015 Hydrograph ]  
+
*[https://www.usbr.gov/uc/progact/amp/twg/2014-06-24-twg-meeting/Attach_06a.pdf Basin Hydrology, Operations, and 2015 Hydrograph ]
−
*[http://www.usbr.gov/uc/rm/amp/amwg/mtgs/14feb19/Attach_02.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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===[http://www.usbr.gov/uc/water/crsp/cs/gcd.html ''Operational Flexibility'']===
 
  
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In addition to daily scheduled fluctuations for power generation, the instantaneous releases from Glen Canyon Dam may also fluctuate to provide 40 megawatts (mw) of system regulation.  These instantaneous release adjustments stabilize the electrical generation and transmission system and translate to a range of about 1,200 cfs above or below the hourly scheduled release rate.  Under system normal conditions, fluctuations for regulation are typically short lived and generally balance out over the hour with minimal or no noticeable impacts on downstream river flow conditions.
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Releases from Glen Canyon Dam can also fluctuate beyond scheduled releases when called upon to respond to unscheduled power outages or power system emergencies.  Depending on the severity of the system emergency, the response from Glen Canyon Dam can be significant, within  the full range of the operating capacity of the power plant for as long as is necessary to maintain balance in the transmission system.  Glen Canyon Dam typically maintains 30 mw (approximately 880 cfs) of generation capacity in reserve in order to respond to a system emergency even when generation rates are already high.  System emergencies occur fairly infrequently and typically require small responses from Glen Canyon Dam.  However, these responses can have a noticeable impact on the river downstream of Glen Canyon Dam.
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===[http://www.usbr.gov/uc/water/crsp/cs/gcd.html''Hydrologic Variability'']===
 
  
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The Upper Colorado River Basin regularly experiences significant year to year hydrologic variability.  During the 16-year period 2000 to 2015, 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 3 out of the past 16 years.  The period 2000-2015 is the lowest 16-year period since the closure of Glen Canyon Dam in 1963, with an average unregulated inflow of 8.51 maf, or 79% 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 2000-2015 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.  The water year 2015 unregulated inflow volume to Lake Powell was 10.174 maf (94 percent of average), which, though still below average, was significantly higher than inflows observed in 2012 and 2013 (45% and 47 percent of average, respectively).
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Latest revision as of 10:22, 14 October 2026
Hydrology.jpg

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. [1]

Current Status
Current Operations
Inflow Forecasts and Model Projections

Updates

Upper Colorado Region Homepage

USBR Weekly Water Reports

  1. Reservoir inflows (forecast and observed)
  2. Reservoir releases
  3. SNOTEL
  1. Water use

USBR Monthly/Annual Reports

  1. Most Probable 24-Month Study
  2. Probable Minimum 24-Month Study
  3. Probable Maximum 24-Month Study

Snow Pack Reports

U.S. Drought Monitor

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

10-year average natural inflow (2015-2024): 12.60 maf
10-year average unregulated inflow (2016-2025): 8.06 maf
10-year average release (2016-2025): 8.30 maf
10-year average Lees Ferry Gage (2016-2025): 8.44 maf

Water Year Naturalized Flow at Lees Ferry (maf) Unregulated Inflow (maf) Release Volume (maf) 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
Temp Precip Flows.png


WaterUse.png

Stream Flow Gages

Presentations and Papers

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009


Other Stuff
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