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lNTR(JXJcrION e '!he U.S. Geological Survey o{Erated a streamflow-gaging station from 1894- 99 and 1~4-82 on the Green River at Green River, Emery County, Utah (fig. 1). The station is identified as station 09315000, Green River at Green River, Utah, in reports of the U.S. Geological Survey (1966-82). Fluvial-sediment records were collected at the station from 1930-82. The records collected from 1930-65 were compiled by Mundorff (1968, p. 129-152), and {Brticle-size data also were included in that report. Records collected after 1965 were reported annually by the U.S. Geological Survey (1966-82), including puticle- size data, daily roncentrations, and daily loads. Pur::pose and Sco,pe The purpose of this report is to evaluate the sediment data that were oollected at station 09315000 and to describe sus{Erx:led-sediment loads in the Green River at Green River, Utah. based on those <Eta. A J;redictive regression model was constructed for estimating annual sus{Erded-sediment loads using annual stream disd1arge as the indepmdent variable. It is beyond the srope of this report to calculate total fluvial-sediment loads, which requires bedload <Eta, or to do a detailed analysis of the records. e e General DescriDtion of the Green River Basin The Green River basin upstream from gaging station'O 9315000 includes about 44,850 square miles in Utah, Colorado, and Wyoming, of which about 4,260 square miles are noncontributing. About 3,960 square miles of the noncontributing drainage basin are located in the Great Divide Basin in southern Wyoming. The station is 1.1 miles southeast of the town of Green River, Utah, and 117.4 river miles upstream from the mouth of the Green River. The Green River, which is the largest tributary to the Colorado River, heads in the Bridger National Forest area of the Wind River Range, Wyoming (fig. 1). Principal tributaries of the Green River upstream from station 09315000 are the Big Sandy River, Blacks Fork, and the YamJ;:8, Duchesne, White, and Price Rivers- Flaming Gorge Reservoir is the largest impoundment on the Green River. Flaming Gorge ram is 407.5 river miles upstream fran the river mouth, and 2~.1 river miles upstream from station 09315000. 'Ihe reservoir has a capacity of 3,789,000 acre-feet, of which 39,700 acre-feet is dead storage. The drainage above the reservoir is 19,350 square miles, which is about 43 percent of the drainage upstream from station 09315000 at Green River, Utah. Storage in Flaming Gorge Reservoir began November 1, 1962. Fontenelle Reservoir is about 160 river miles upstream from Flaming Gorge Reservoir. Storage in Fontene1le Reservoir began April 1964, after the oomp1etion of Flaming Gorge Dam; consequently, Fontenel1e Reservoir has had no direct effect on sediment transport at the Green River station 09315000. Altitudes in the drainage basin range from about 13,800 feet at Gannett Peak near the headwaters of the Green River to 4.040.18 feet at station 09315000. The climate ranges from humid in the headwaters to arid near the ~ station. '!he average annual J;recipitation for 1906-81 near the station was 2