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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 />