8188

• UCREFRP Catalog Number: 8188
• Author: Muth, R. T., et al.
• Title: Flow and Temperature Recommendations for Endangered Fishes in the Green River Downstream of Flaming Forge Dam.
• USFW Year: 2000.
• USFW - Doc Type: \
• Copyright Material: NO

Final Report

1-11

September 2000

Table 1.t.-Continued.

Study 5-Trophic Dynamics and Ecological Interactions in Important Backwater Habitats

· Some Aspects of Trophic Interactions in Selected Backwaters and the Main Channel of the Green
River, Utah. 1987-1988 (Grabowski and Hiebert 1989)

Study 6-Mapping of Important Backwater Habitats of Colorado Squawfish

· Comprehensive Report (1986-1988) on the Effects of Green River Flows on Backwater Habitat
Availability as Determined by Remote Sensing Techniques (Pucherelli and Clark 1989)

HYDROLOGICAL MODELING STUDIES

Study 1-HYDROSS Monthly Flow Model

Study 2-Peaking Power Model

Study 3-Channel Stability Model

Study 4-Temperature Model

The bypass tubes at Flaming Gorge Dam are capable of releasing approximately
113 m3/s of water in addition to the water releases of 130 m3/s that can be
accommodated through the power plant. One concern over utilizing bypass flows to
increase the magnitude of the spring peak releases from Flaming Gorge Dam is that no
electric power is generated by this water. Consequently, the Biological Opinion called
for examination of the feasibility of retrofitting the bypass tubes to include power
generation capability.

4. Legal protection of Green River flows from Flaming Gorge Dam to Lake Powell. The
state of Utah has indicated that until quantifiable recommendations are made for flows
throughout the Green River (i.e., from Flaming Gorge Dam to Lake Powell), legal
protection of flows will not be pursued. The Biological Opinion only recommends
target flows in the Green River near Jensen, Utah. Therefore, the Flaming Gorge Flow
Recommendations Investigation contained provisions for collecting data to identify and
recommend flows and temperatures required to enhance and recover endangered fishes
of the Green River ecosystem from Flaming Gorge Dam to the confluence with the
Colorado River.

5. Initiate discussions with the Service after conclusion of the 5-year research program
to examine further refinement of flows for the endangered Colorado River fish. Under
this element, results of the research program will be used to reevaluate and, if
necessary, refine recommendations presented in the 1992 Biological Opinion.