9658 - Laserfiche WebLink

Home Browse Search

the confluence with Evacuation Creek at dan 97. The river slope is 0.0022 and the channel crosses the Mahogany Ledge oil shale member of the Green River formation. Our detailed study site (Fig. 5) lies just downstream from this steep subreach. The study site extends 0.8 km upstream and 0.2 km downstream from the U.S. Geological Survey's gaging station located near Watson at rkm 93. The Watson gage (station 09306500) is loeated 107 m downstream from the bridge on Utah State Highway 45 and is at an elevation of 1508 m above mean sea level. It is 1.6 km downstream from Evacuation Creek, and 11 km north from Watson. The drainage area upstream from the gage is 10,412 km2. The gage was in operation from April 1904 to October 1906 (no winter records), May to November 1918, April 1923 to September 1979, and had been in operation since October 1985. The gage was deactivated in 1979 and relocated near the Colorado State line in anticipation of a proposed water storage project. The project was abandoned, and the gage was reactivated at its previous location in 1985. Mean daily discharge values and all peak floods above 28 m3/s for these time intervals are published and available from the USGS. The stage-discharge relationships at the gage that have been developed by the USGS have been based on repeated measurements. The notes from these measurements contain information on the width and depth of the channel. We analyzed data collected since 1968; earlier records are not available. Meandering reaches occur upstream and downstream from the study reach; the channel is predominantly straight and more narrowly confined where we collected data. Bedrock canyon walls are on average between 0.3 and 0.5 km apart. The reach contains several pool-riffle sequences, and has an overall slope of 0.0012. The White River through its lower course is a meandering stream. The river's 8