WSPC12502 ‎(2)‎

• File Number: 8220.101.10
• Description: Colorado River Water Projects - Glen Canyon Dam-Lake Powell - Adaptive Management
• State: CO
• Basin: Colorado Mainstem
• Date: 6/10/1998
• Author: Unknown
• Title: Glen Canyon Dam Management Objectives - Draft - 06-10-98
• Water Supply Pro - Doc Type: Report/Study

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IN 3/4.12 Determine impacts of flows on young HBC during study flows, and
develop methods of detecting changes in numbers, to assist in establishing
levels of incidental take. (RPM)

IN 3/4.13 Develop biological criteria governing the implementation of special flows
that will assure that the level of incidental take of HBC is not exceeded.
(RPM)

IN 3/4.14 Evaluate all test flows in RPM, using monitoring and research programs
and, determine potential impacts to threatened and endangered fish.

MO 5: Remove jeopardy for the HBC in the Colorado River ecosystem (B. 0. 1994).

MA 5.1 Evaluate and implement, as appropriate, a selective withdrawal program
for Lake Powell waters (RPM I.B).

IN 5.1 Determine a set of possible temperature changes in the mainstem Colorado
River resulting from implementing selective withdrawal (RPM 1.B.i).

IN 5.2 Determine the anticipated effects on HBC and other native populations which
may result from installing a selective withdrawal structure for thermal
modification in the mainstem of the Colorado River downstream of Glen
Canyon Dam. Determine the range of temperatures for successful larval fish
development and recruitment and the relationship between larval/juvenile
growth and temperature (RPM I.B.ii).

IN 5.3 Determine the effects of dam operations under the approved operating criteria,
including installing a selective withdrawal structure for thermal modification
in the mainstem of the Colorado River downstream of Glen Canyon Dam, on:

a. reproductive success, growth, and survivorship of Grand Canyon
fishes;

b. parasites and disease organisms of endangered and native fishes in the
Colorado River ecosystem;

c. temperature induced interactions between native and non-native fish
competitors and predators; and

Revised 6-10-98