Trout Management Flows - Revision history

Cellsworth at 22:06, 17 June 2026

2026-06-17T22:06:55Z

Cellsworth at 20:24, 3 January 2025

2025-01-03T20:24:21Z

Cellsworth at 23:10, 10 January 2023

2023-01-10T23:10:05Z

Cellsworth at 21:46, 24 October 2022

2022-10-24T21:46:38Z

Cellsworth at 21:14, 24 October 2022

2022-10-24T21:14:03Z

Cellsworth at 21:02, 24 October 2022

2022-10-24T21:02:21Z

Cellsworth at 17:54, 18 August 2022

2022-08-18T17:54:42Z

Cellsworth at 17:53, 18 August 2022

2022-08-18T17:53:14Z

Cellsworth at 20:18, 15 April 2022

2022-04-15T20:18:00Z

Cellsworth at 17:38, 15 April 2022

2022-04-15T17:38:47Z

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 '''2024'''

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 '''2022'''

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 '''2022'''
 *[https://www.usbr.gov/uc/progact/amp/twg/2022-06-16-twg-meeting/20220616-TroutManagementFlowsWhitePaper-Presentation-508-UCRO.pdf Trout Management Flows White Paper ]
 *[https://www.usbr.gov/uc/progact/amp/twg/2022-06-16-twg-meeting/20220616-ConsiderationsImplementationTroutManagementFlowExperiment-508-UCRO.pdf Considerations for Implementation of a Trout Management Flow Experiment ]

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 '''2003'''
 *[https://www.usbr.gov/uc/progact/amp/amwg/2003-08-13-amwg-meeting/Attach_04.pdf Stranding of Adult Rainbow Trout during Experimental Fluctuating Releases from Glen Canyon Dam on the Colorado River]
 '''1995'''

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 *[https://www.researchgate.net/publication/267839345_Effects_of_the_Experimental_Fluctuating_Flows_from_Glen_Canyon_Dam_in_2003_and_2004_on_the_Early_Life_History_Stages_of_Rainbow_Trout_in_the_Colorado_River Korman et al., 2005, Effects of the Experimental Fluctuating Flows from Glen Canyon Dam in 2003 and 2004 on the Early Life Stages of Rainbow Trout in the Colorado River, final report, U.S. Geological Survey, Grand Canyon Monitoring and Research Center, Flagstaff, Ariz.]
 *[https://www.usbr.gov/uc/progact/amp/twg/2005-05-18-twg-meeting/Attach_06.pdf Effects of 2003/2004 GCD Enhanced Fluctuating Flows on the Early Life History Stages of Rainbow Trout in Glen Canyon]
 '''1995'''

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 '''2022'''
 *[https://www.usbr.gov/uc/progact/amp/twg/2022-01-13-twg-meeting/20220113-AnnualReportingMeeting-TroutManagementFlows-508-UCRO.pdf Trout Management Flows - A Literature Review and Stranding Risk Modelling Component Project H ]
 *[https://www.usbr.gov/uc/progact/amp/twg/2022-01-13-twg-meeting/20220113-AnnualReportingMeeting-EstimatingEfficacyTroutManagementFlows-508-UCRO.pdf Estimating the efficacy of trout management flows using bioeconomic and hydropower modeling ]
 '''2020'''

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 </table>
-[[File:TMF conceptual model.JPG|400px|center|thumbnail|[[Media:TMF June 2019 Revised.pdf| Trout Management Flows: A Review of Data, Research Results, and Information Needs ]] ]]
+[[File:TMF conceptual model.JPG|500px|center|thumbnail|[[Media:TMF June 2019 Revised.pdf| Trout Management Flows: A Review of Data, Research Results, and Information Needs ]] ]]
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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;">Possible Trout Management Flow (TMF) Treatments</h2>
+! <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;">Trout Management Flow (TMF) Uncertainties</h2>
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-==Treatment 1: Redd stranding flows (with mechanical removal of redds below the minimum flow elevation)==
+*How high does the max flow (Q) need to be?
-[[File:TMF_ReddStranding.JPG|thumb|right|400px]]
+[[File:TMFmodel.PNG|600px|center|thumbnail|https://www.usbr.gov/uc/progact/amp/twg/2022-01-13-twg-meeting/20220113-AnnualReportingMeeting-TroutManagementFlows-508-UCRO.pdf]]
 This treatment uses flow manipulation at Glen Canyon Dam to periodically dewater redds (nests trout build to lay their eggs in) during the rainbow trout spawning period thereby reducing the number of viable eggs that could hatch and recruit to the age-0 trout population. The objective of this treatment would be to dewater and/or mechanically remove between 50% and 90% of the redds produced over the spawning season. This is one of the mechanisms that is thought to have limited age-0 trout recruitment under pre-ROD conditions.
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 Increasing turbidity in Marble Canyon to the levels discussed here would likely not impact humpback chub and other native fish since they evolved in a turbid river environment. This treatment has the potential to be able to reduce the Program’s reliance on mechanical removal and other more lethal and expensive approaches to TMFs that some groups (i.e. Tribes, anglers, power users, etc.) find objectionable. Increased turbidity may also reduce direct predation pressure on native fish by nonnative fish like rainbow trout. Predation by other nonnative fish, like brown trout, appear not to be affected by the levels of turbidity being discussed here. Reducing the number of fall HFEs would have a negative impact to sediment-related resources unless the sediment accounting periods in the HFE protocol could be adjusted to allow for fall sediment from the Paria be used for a spring HFE, of which a number of resources would benefit including foodbase, the trout fishery, and recreational beach use.
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