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. COLORADO WATER CONSERVATION BOARD 823 State Centennial Building 1313 Sherman Street Denver, Colorado 80203 January 6-7, 1983 Stagecoach Reservoir Project (Upper Yampa Water Conservancy District) Introduction The Stagecoach Reservoir site is located on the Yampa River about 3 miles east of the towns of Phippsburg and Oak Creek. The proposed project would create a reservoir of about 33,700 acre-feet, of which 3,500 acre-feet would be inactive storage. The project would supply water for future municipal and innustrial uses in addition to providing supplemental irrigation water in the area served by the Upper Yampa Water Conservancy District (District). . Study Status The District submitted an application in September, 1982. CWCS staff met with District representatives, visited the project site, and discussed the project with them. The District decided to fund the initial study with its own money. Colorado-Ute Electric Association, tnc., performed the study. proposed Project The Stagecoach Reservoir would be created by the construction of a dam with a maximum height of 145 feet above streambed and a crest length of nearly 900 feet. The reservoir would have a water surface area of approximately 780 acres at an elevation of 7,200 feet. As mentioned earlier, the reservoir capacity would be 33,700 acre-feet of which approximately 3,500 acre-feet would be inactive storage. The outlet works would be a gated, 66-inch diameter steel pipe tapering to 30-inches, thus allowing for the possible addition of a hydropower component to the project at a later date. The total cost of the project is presently estimated at $12,000,000. Additional analysis of dam designs, which the staff believes are necessary, could affect this estimate. Discussion The project raises a number of important pOlicy issues which will need to be addressed, including: . 119 stage/c