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0.00249 m/m. The slope decreases to 0.00170 m/m downstream from Randlett for a <br />dislanceof about 15 km. The lower 10 km further decreases in slope to 0.00047 m/m. <br />i' <br />The lower 10 km of the Duchesne River includes the 4 km of proposed c-itical <br />habitat for the razorback sucker. Sand bars occur along both banks of the river at low <br />flow and bars increase in size and frequency upstream. Most sand bars are unvegetated <br />or have some cocklebur and sprouting saltcedar. Many of these sand bars are inundated <br />during high spring runoff. During high spring discharge, Maddux et al. (1993) <br />observed large eddies and slow runs at the confluence with the Green River. The tops of <br />the banks are over grown with saltcedar, grasses, russian olive, and a few cottonwood <br />trees. <br />Gravel and cobble bed materials begin about i 0 km upstream from the confluence <br />and continue through the rest of the study reach, to the confluence with the Lake Fork <br />River. Sand bars are replaced by gravel bars and small islands, some of which have <br />permanent vegetation. The banks are less steep and more ill-defined than downstream, <br />although some cut banks are still present. Saltcedar and russian olive still dominate the <br />vegetation at the top of the banks. Willows and cottonwoods are also present. <br />The study area on the Duchesne River was divided into three reaches (Fig. 1). <br />Reach 1 is the first 10 km upstream from the confluence with the Green River. Reach 2 <br />extends upstream from reach 1 to the confluence with the Uinta River. This reach <br />includes the Geological Survey's gage near Randlett. Reach 3 is between the confluences <br />with the Uinta and Lake Fork Rivers and includes the gage at Myton. <br />11 <br />