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In 1975, data to calibrate a one-dimensional unsteady-flow and sedimenttransport routing model were collected on a reach of the East Fork Piver of western Wyoming. The reach, 3.1 miles (5 kilometers) in length, wan immediately upstream from a previously established bedload sampling station. Nineteen channel cross sections were sounded at regular intervals during the spring-runoff period. Four stage recorders provided continuous records of water-surface elevations. Samples of bed material at most of the cross sections were obtained prior to high water. Streamflow and sedimentdischarge measurements were collected at four of the sections. The physiography and hydrology of the contributing watersl-ed, the study reach, and the equipment and techniques used in data collection are described briefly. The bulk of the report is a presentation of data for the several-week period of late May to early June 1975, for which concurrent water discharge data, bedload transport and size data, and cross-section depth measurements were collected. In addition, some data collected in 1973 and 1974 and before and after the calibration period in 1975 are included for completeness. INTRODUCTION In 1975, data to calibrate a one-dimensional unsteady-flow and sedimenttransport model were collected on a reach of the East Fork River near Boulder, Wyo. A bedload trap at the downstream end of the reach provided accurate sediment-discharge measurements for the model calibration and served as a control structure for both the stage-discharge relation anc1 the streambed elevation for the downstream boundary conditions of the model. Leopold and Emmett (1976) describe the trap and bedload data collected through 1975. This report presents the basic data collected for the model calibration. In addition, for completeness, some data collected before and after the calibration period are Included. In the following section, the river and the drainage basin are described briefly, and some background physiographic and hydrologic data are presented. This is followed by a description of the study reach, the instrumentation, and the data-collection procedures. Finally, the data are presented in figures and tables. PHYSIOGRAPHY AND HYDROLOGY The East Fork River rises in the Wind River Range of Wyoming west of the Continental Divide and east and south of the multiple summits of M".. Bonneville (fig. 1). From a series of small alpine lakes and an elevation of approximately 11,150 ft (3,399 m), the East Fork River descends more than 4,000 ft (1,219 m) in 33 river mi (53 km) to the study reach covered in this report. Downstream from the study reach, it continues another 30 mi (48 km) to its confluence with the New Fork River, tributary to the Green River. The longitudinal profile of the East Fork River is shown in 2 MT. BONNEVILLE WYOMING AREA OF REPORT GAGING STATION EAST FORK NR. BIG SANDY SECTION B-17 OF STUDY REACH SECTION B-1 OF STUDY REACH

Data for calibrating unsteady-flow sediment-transport models, East Fork River, Wyoming, 1975