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Last modified
7/14/2009 5:02:31 PM
Creation date
5/22/2009 6:49:34 PM
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UCREFRP
UCREFRP Catalog Number
7906
Author
Upper Colorado River Basin Instream Flow Team.
Title
Green River, Determination of Flow Needs Using the Physical Habitat Simulation System (PHABSIM) in the Green River, Utah - Draft.
USFW Year
1988.
USFW - Doc Type
\
Copyright Material
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800 linear kilometers (500 mi) to its headwaters in the Wind River Range <br />Wyoming (Tvus et. al 1987). Historically, from 1955 to 1961, the mean <br />monthly flows ranged at the Jensen gauge, RM 305, from a low of 533 cfs <br />in December, to a high of 26440 cfs in June. Presently, 1962 to 19$6, the <br />mean monthly flows have ranged from a low of 346 cfs in October, to a high <br />of 24110 cfs in May (Appendix A). <br />A. Ruple Ranch Study Site <br />The Ruple Ranch study site, 3282 ft in length, is located between RM <br />332.3 and 333.0 and morphologically represents sub-segment E of Segment 3, <br />from Little Rainbow Park upstream to the Cove just below Whirl Pool Canyon <br />(RM 326.8-334.0). The area encompasses Little Rainbow, Rainbow, and <br />Island Parks, and is dominated by multiple channels and numerous vegetated <br />islands (Figure 6). The river meanders with a low gradient <br />(slope=0.00097) through an alluvial flood plain resting on Navajo <br />sandstone. The west edge of the river joins a broad flood plain vegetated <br />by sagebrush (Artemisia sp.), saltbush (Atriplex sp.), rabbitbrush <br />tChrysothairn~s sp.), a variety of grasses, and a few cottonwood trees <br />(Populus sp.). The east edge is bound by a steep, sparsely vegetated bank <br />which lies against sheer walls of sandstone. <br />The channel stability of the Ruple Ranch study site is presently <br />being analyzed by the FWS Division of Water Resources, Region 6. The <br />preliminary evaluation of the channel processes, location and extent of <br />islands, bars, vegetation, topography, geology, and land use suggests that <br />persistent channel narrowing has ceased and a new equilibrium condition <br />has been attained in the Green River (Regional Hydrologist, Division of <br />. ~ <br />20 <br />
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