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Table 2. Reservoirs with a normal capacity greater than 5,000 acre-feet located in the Upper Colorado River Basin-Continued Reservoir State Latitude (°-min-s) Longitude (°-min-s) Location (river basin) Year completed Normal capacity (acre-feet) Oak Park Reservoir Utah 40-44-36 109-37-12 Big Brush Creek 1938 6,249 Overland Reservoir #1 Colo. 39-04-42 107-38-42 Peters Creek 1951 5,990 Paonia Reservoir Colo. 38-56-36 107-21-12 Muddy Creek 1962 20,950 Pearl Lake Colo. 40-46-48 106-53-18 Lester Creek 1975 5,657 Pelican Lake Utah 40-11-00 109-40-48 Uinta River 1967 11,850 Red Creek Reservoir Utah 40-18-12 110-50-54 Red Creek 1960 5,700 Rifle Gap Reservoir Colo. 39-37-48 107-45-42 Rifle Creek 1967 13,600 Ruedi Reservoir Colo. 39-21-50 106-49-06 Fryingpan River 1968 102,500 Scofield Reservoir Utah 39-47-12 111-07-30 Price River 1946 73,600 Shadow Mountain Reservoir and Grand Lake Colo. 40-12-24 105-50-24 Colorado River 1947 18s400 Silver Jack Reservoir Colo. 38-14-42 107-32-36 East Fork Cimarron River 1971 13,520 Sixty-seven Reservoir Wyo. 42-35-24 110-12-30 Spring Creek 1942 5,211 Starvation Reservoir Utah 40-11-26 110-26-28 Strawberry and Duchesne Rivers 1970 167,000 Steamboat Lake Colo. 40-47-30 106-56-48 Willow Creek 1966 23,064 Steinaker Reservoir Utah 40-30-00 109-32-00 Ashley Creek 1961 38,170 Stillwater Reservoir #1 Colo. 40-01-48 107-07-12 Yampa River 1939 6,088 Strawberry Reservoir Utah 40-08-24 111-06-12 Strawberry River 1912 1,106,500 Summit Reservoir Colo. 37-25-18 108-23-12 Tributary of Lost Canyon Creek 1939 5,954 Taylor Park Reservoir Colo. 38-49-07 106-36-24 Taylor River 1935 106,200 Vallecito Reservoir Colo. 37-23-00 107-34-30 Los Pinos River 1941 129,700 Vega Reservoir Colo. 39-13-30 107-48-40 Plateau Creek 1959 33,800 Viva Naughton Reservoir Wyo. 41-57-48 110-39-30 Hams Fork 1961 42,393 Williams Fork Reservoir Colo. 40-02-06 106-12-18 Williams Fork 1959 93,637 Williams Reservoir Colo. 37-30-12 107-13-30 Williams Creek 1958 10,084 Willow Creek Reservoir Colo. 40-08-49 105-56-31 Willow Creek 1953 10,600 Willow Lake Wyo. 42-59-30 109-54-30 Lake Creek 1931 22,630 Yamcolo Reservoir Colo. 40-03-18 107-02-48 Bear River 1980 9,080 duction peaked during World War I, then declined until the late 1960's, when demand from electric utilities and industry caused a resurgence of production from surface mining (Green and others, 1980). Oil and gas have been produced in the Upper Colorado River Basin since the early 1900's. The world's largest deposits of oil shale occur in the central area of the Green River basin. Mining and energy resources development can con- tribute dissolved solids to water in the Upper Colorado River Basin. Abandoned oil and gas wells can serve as conduits for deep, saline water to mix with shallow ground water which then discharges to streams. Also, the leaching of solutes from coal spoils can contribute large quantities of dissolved solids to streams (McWhorter and others, 1975). LEGISLATION AFFECTING WATER RESOURCES Water use in the Upper Colorado River Basin is con- trolled by law and by formal agreements among users. Some legal constraints are designed to protect the quality of water by limiting dissolved-solids concentrations. Water Allocation In 1922, representatives of the States in the Colorado River basin drafted the Colorado River Compact, which was approved by Congress in 1928 (Upper Colorado River Com- mission, 1950). The Compact formally divided the basin into the Upper Colorado River Basin and the Lower Colorado River Basin at Lee Ferry, Ariz., along the main stem of the Colorado River. Those parts of the Colorado River basin that naturally drain into the Colorado River upstream from Lee Ferry, Ariz., were included in the Upper Colorado River Basin and the remainder were included in the Lower Colo- rado River Basin. A distinction also was made between the States of the upper division (Colorado, New Mexico, Wyo- ming, and Utah) and the States of the lower division (Arizona, California, and Nevada). The flow of the Colorado Legislation Affecting Water Resources 13