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7. Review of USFWS Preliminary Recommended Flows. This task examined the USFWS preliminary flow recommendations and their development. ' 8. Determination of Flow Deficiencies and Surpluses in Comparison of Actual and Proposed Flows to USFWS Flows. This task considered determining USFWS preliminary flow recommendations impact on Duchesne River discharges at Randlett historically, at the present, and for proposed future operation. 1 1 9. Determination of Potential Sources of Water to Meet USFWS Preliminary Flow Recommendations. This task looked at determining potential sources for needed water to meet USFWS flows. No determination was made about the availability of the water identified. 10. Final Report. This task involved documenting the results of the study effort and compiling the first nine tasks into this report. Duchesne River Basin Description The Duchesne River Basin is shown in Figure 1-1. The basin has an area of over , 4,200 square miles and drains the south side of the Uinta Mountains. Major tributaries to the Duchesne River include Strawberry River, Rock Creek, Lake Fork, Yellowstone, Uinta, and Whiterocks Rivers. Major reservoirs include Strawberry Reservoir on the Strawberry River, Currant Creek Reservoir on Currant Creek, Starvation Reservoir on the Strawberry River with diversions from the Duchesne River, Upper Stillwater Reservoir on Rock Creek, and Moon Lake Reservoir on the Lake Fork River. The Strawberry Aqueduct and Collection System of the Bonneville Unit of the Central Utah Project diverts water from the upper reaches of Rock Creek, the Duchesne River, and Currant Creek into Strawberry Reservoir. Other trans-basin diversions include the Duchesne Tunnel which diverts water from the upper Duchesne River to the Provo River, and the Daniels Creek Diversion which has historically diverted water from the upper Strawberry River to Daniels Creek in the Provo River Drainage. Study Purpose and Objectives The main purpose of the study was to determine the effect of existing projects (both existing and future operation) on Duchesne River flows and to identify possible water sources on the Duchesne River that could be used to augment river flows, if needed, to meet USFWS endangered fish preliminary flow recommendations. The study objectives are described below: • To determine the present flow regime on the lower Duchesne River • To determine historical changes to the present flow regime • To identify flow surplus or deficiencies of the present flow regime with respect to USFWS preliminary recommended flows • To locate potential water sources in order to meet any needed flow deficiencies SLC~73410TAEPTI.DOC 1 - 2