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- \ -,.,,~~._~ ... --------" Flow Analysis of the Duchesne River With Full Bonneville Unit Operation The Bonneville Unit of the CUP diverts water from the Duchesne River Basin into the Great Basin via Strawberry Reservoir, and diverts water into Starvation Reservoir for distribution in the Uintah Basin. The Bonneville Unit has been under construction for over 30 years, Diversions into Strawberry Reservoir began in December 1971, with small amounts of water delivered to the reservoir until 1985, with the completion of remedial work at Soldier Creek Dam, Completion of the entire collection system did not occur until final work at Stillwater Reservoir was completed in 1989. Bonneville Unit project deliveries to Strawberry Reservoir have been at capacity since 1989, with the exception of minor releases at Rock Creek due to remedial work on the Upper Stillwater Dam. Diversion into Starvation Reservoir began in December 1969. Under full demands, the Bonneville Unit depletions from the Duchesne River will average 143,200 acre-feet annually. Flow Analysis of the Duchesne River With Uintah Basin Replacement Project Proposed Operation The Uintah Basin Replacement Project (UBRP) is a water development project proposed by the CUWCD to replace the Upako and Uintah Units of the CUP in northeastern Utah, The project will, in part, assist the Ute Indian Tribe of the Uintah and Ouray Reservation in the development and management of water resources. The project will also provide early and late season irrigation water, and provide water for environmental purposes for fishery flows. The UBRP consists of two units, the Upako and Uintah Units. The UBRP is expected to impact the Duchesne River by depleting additional flows from the river. These total expected depletions are shown in the table below. Uintah Upako Total 15,000 10,300 26,300 USFWS Flow Recommendations The USFWS preliminary flow recommendations for the Duchesne River were provided in a January 23, 1995 letter to the CUWCD and a March 9, 1995 memorandum to John Hamill from the Upper Colorado River RIP. The March 9,1995 memorandum was a modification of the January 23, 1995 letter. Recommendations were further augmented with additional information from the workshop meetings held during this study. USFWS letters and correspondence describing their flow recommendations are located in the Appendices. Due to limited available biological information specific to the Duchesne River, flow recommendations were based solely on hydrologic data. The hydrologic data used for the SLC\l34lO7\REPT1DOC E.3