6006

• UCREFRP Catalog Number: 6006
• Author: Holden, P. B. and L. W. Crist.
• Title: Documentation of Changes in the Macroinvertebrate and Fish Populations in the Green River Due to Inlet Modification of Flaming Gorge Dam
• USFW Year: 1981.
• USFW - Doc Type: Final Report.
• Copyright Material: NO

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In addition, Dinosaur National Monument and the U.S. Fish and Wildlife
Service (Western Energy and Land Use Team, Ft. Collins, Colorado)
supplied additional funding to BID/WEST for macroinvertebrate and fish
studies on the Yampa River, a major tributary of the Green River (Figure
1). The sampling stations established in the Yampa River were used as
control points for the Green River stations. This report details the
work undertaken by BIO/WEST during this study. The objectives of the
study were:
1. Document existing species composition and relative abundance of
benthic macroinvertebrates and fishes.
2. Co~pare the composition and relative densities of benthic
macroinvertebrates before and after penstock modifications.
3. Assess changes in the distribution and reproduction of native
and introduced river fishes associated with altered temperature
regimes.

STUDY AREA

The study area encompasses the Green River from Flaming Gorge Dam to
near the town of Jensen, Utah, a distance of 110 miles, and the Yampa
River from the mouth of Cross Mountain Gorge (Lily Park) to its mouth, a
distance of 55 miles.
Macroinvertebrates were sampled at Little Hole (7 MBD), Taylor Flats
(16.5 MBD), Wade and Curtis (49 MBD), and the Jensen U.S.G.S. gaging
station (94 MBD) on the Green River, and the mouth of Cross Mountain
Gorge in Lily Park, and Box Elder Park on the Yampa River (Figure 1).