WSP01756 - Laserfiche WebLink

Home Browse Search

~ a to -t CHAPI'ER IV EAST RIVER UNIT spillway capacity at elevation 9,280 feet would be 5,500 cubic feet per second. The outlet from the reservoir, consisting of two parallel condu- its, would extend through the control portion of the dam to the stream channel. The outlet was designed to discharge 50 cubic feet per second with the water surface at the top of the inactive capacity, elevation 9,251.8 feet. With the water surface at this elevation, however, 645 cu- bic feet per second could be discharged in case of an emergency. Seepage losses from the reservoir are expected to be negligible. Bed- rock consists of impervious granite that forms a watertight seal for the basin. Approximately 120 acres of private land and 400 acres of Federal land would need to be purchased or withdrawn at the reservoir site. The reser- voir would inundate a dude ranch on the west side of the basin. A power line and telephone line, each 3/4 mile in length, would need to be relo- cated. Also two bridges and 2 miles of Forest Service road would be relo- cated east of the dam site and around the reservoir basin. About 40 acres of willow and aspen would need to be cleared from the reservoir basin. Details of the design for Cement Creek Dam are shown on the follow- ing page. Since the design was made, some changes have been made in the allocations of reservoir storage to active and inactive capacity but no changes have been made in the basic data for the dam. Permanent operating facilities The unit would share operation and maintenance headquarters at Gun- nison with any other units which might be constructed. Development Program Federal development of the East River Unit would require about 4 years, including a year of advance planning studies. A construction period of three summer seasons would be required for Cement Creek Dam. Recreational facilities and permanent operating facilities would be constructed during the fourth year. Water Utilization Water would be stored in Cement Creek Reservoir during the spring run- off months of April, May, and June and released throughout the year for mu- nicipal, domestic, and fishery uses. The reservoir would normally fill in May and reach its low point in late winter or early spring before the spring snowmelt begins. During the Memorial Day-Labor Day recreation season the reservoir would fluctuate very little because of the large inactive storage capacity and year round releases. An average of 7 acres of foreshore would be exposed late in August each year. Fishery flows of not less than 10 24