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1 pediment surfaces. The east-flowing segment of the river is comprised of an open valley that has been established in the erodible Tertiary Duchesne River formation. The river flows southeast from its headwaters towards the town of Duchesne. The Duchesne River flows east between the towns of Duchesne and Randlett, and major tributaries draining the Uinta Mountains between Bald Mountain and Mount Agassiz join the mainstem within this section of the river. The Lake Fork River enters the Duchesne River approximately 4.8 km upstream from the town of Myton, and the Uinta River enters approximately 1.6 km southeast of the town of Randlett. Downstream from Randlett, the Duchesne River flows southeastward and joins the Green River near Ouray. Two U.S. Geological Survey gaging stations are located within the study area. The gage station at Myton is located in the town of Myton, just downstream from the U.S. 40 highway bridge. The station near Randlett is located 0.4 km downstream from the confluence of the Uinta River. BACKGROUND reomoroholoav of the Study Reach The channel bed is primarily composed of cobbles, gravel, and sand, except in the ~ ,2 ,,,, , lower 10 km where the bed is sand and silt. Cobbles and gravel enter the channel from tributaries and wherever the channel is located at the outside margin of the alluvial valley. At these Locations, conglomerates of the exposed bedrock or overlying Pleistocene gravels fail into the channel. The longitudinal profile of the study reach (Fig. 2) has an overall slope of 0.00216 m/m, but the slope is not constant through the reach. The channel gradient between Myton and Randlett is steeper, with a slope measuring 9