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<br />habitat diversity. Specifically, we wanted to 1) determine what discharges are necessary <br /> <br />to mobilize the bed and, thereby, remove fine-grained sediments from gravel deposits <br /> <br /> <br />and maintain gravel looseness, and 2) identify what discharges transport the majority of <br /> <br /> <br />the sediment load and are responsible for maintaining channel form. <br /> <br />Overview of the White River and Description of the Study Site <br /> <br />The White River basin is in northwest Colorado and northeast Utah (Figure A-I). <br /> <br />The basin is south from the Yampa River basin, and north from the Colorado River. The <br /> <br />White River originates in the Flat Top mountains of western Colorado at an elevation of <br /> <br />approximately 3600 m. From its sources, the river flows westward for approximately <br /> <br />25'0 rm, and has incised shallow canyons through predominantly Tertiary sediments of <br /> <br />the Unita and Green River formations. The river joins the Green River in the central <br /> <br />Uinta Basin several miles downstream from the confluence of the Green and Duchesne <br /> <br />Rivers. The channel has migrated across its valley, and oxbow lakes and the concentric <br /> <br />patterns characteristic of migrating channels are present in many reaches (Figure A-2). <br /> <br />The principal water use in the White River basin is irrigation. Non-agricultural <br /> <br /> <br />diversions are made by the towns of Rangely and Meeker. Combined agricultural and <br /> <br /> <br />non-agricultural water depletions in the White River basin are approximately 304,000 <br /> <br /> <br />acre-feet. Average annual streamflow in the White River at the Colorado-Utah state line <br /> <br />is about 595,100 acre-feet. <br /> <br />Taylor Draw Dam (Figure A-3) was completed in 1984, and is located in <br /> <br />northwestern Colorado at approximately rm 104, as measured upstream from the <br /> <br />confluence with the Green River. Taylor Draw Reservoir has a storage volume of 13,800 <br />6 <br />