General
Belle Fourche Project is located in western South Dakota northeast of the Black Hills. Principal structures include a diversion dam, a storage dam, and a system of canals, laterals, and drains to irrigate 57,068 acres in the general area of Newell, Vale, and Nisland, South Dakota, along the valley of the Belle Fourche River. The project is a single-purpose development; however, flood control, fish and wildlife conservation, and recreation benefits are inherently provided.
History
Belle Fourche, the name of the principal project town, means `Beautiful Forks` in French. The name has reference to the confluence of the Redwater and Belle Fourche Rivers. Frenchmen settled in this vicinity and reportedly engaged in fur trading with the Indians as early as 1854. The gold rush to the Black Hills in 1876 brought many people to the general area. In the early days, raising livestock was the principal industry in the vicinity of the project. The Chicago and Northwestern Railway reached the town of Belle Fourche in 1891 and for the remainder of the century the town was considered to be the largest original shipping point for livestock in the United States.
Construction
Construction of the facilities for the Belle Fourche Project began in 1905 and had progressed sufficiently by 1908 to permit the delivery of irrigation water to 12,000 acres. The original project was completed in 1914. Some of the scheduled extensions of the original project were not constructed because of inadequate water supplies and adverse economic conditions.
Plan
Water for irrigation is diverted from the Belle Fourche River and conveyed by means of Inlet Canal to Belle Fourche Reservoir for regulatory storage and for delivery to project lands. The Keyhole Unit of the Pick-Sloan Missouri Basin Program, consisting of Keyhole Dam and Reservoir on the Belle Fourche River in northeastern Wyoming, provides supplemental storage and a supply of irrigation water. The Belle Fourche Diversion Dam is on the Belle Fourche River about 1.5 miles northeast of the city of Belle Fourche, South Dakota. It has a concrete ogee weir 400 feet long, a structural height of 36 feet, and a 2,100-foot-long earth embankment on the right abutment. The 6.3-mile Inlet Canal, with a capacity of 1,300 cubic feet per second, conveys water from the Belle Fourche Diversion Dam to off-channel regulatory reservoir storage in Belle Fourche Reservoir on Owl Creek behind the Belle Fourche Dam. Belle Fourche Dam (formerly Orman Dam), located about 10 miles northeast of Belle Fourche, is a homogeneous earthfill structure 6,262 feet long and 122 feet high. It was constructed across Owl Creek, an intermittent stream tributary to the Belle Fourche River. The act of October 27, 1974 (88 Stat. 1486), authorized modification of Belle Fourche Dam to include a new spillway and improvement of the upstream slope protection of the dam to ensure safety. The work was started during 1976 and completed in 1977. The new earth-lined spillway has a discharge capacity of 4,500 cubic feet per second. It is located approximately 1 mile south of the right abutment of the dam. The controlled outlet works consist of two horseshoe-shaped conduits through the base of the dam, one each for the North and South Canals, with capacities of 600 and 300 cubic feet per second, respectively. The dam forms Belle Fourche Reservoir which has an active conservation capacity of 185,200 acre-feet, and a water surface area of 8,000 acres. Dead storage is 6,800 acre-feet. Supply, distribution, and drainage systems serving the irrigated lands consist of 94 miles of irrigation canals, 450 miles of irrigation laterals, and 232 miles of drains, including 7 miles of closed (pipe) drains. A compact between the States of Wyoming and South Dakota, confirmed by the Congress of the United States in 1944, provides for the apportionment of Belle Fourche River waters upstream from the Wyoming-South Dakota boundary. This compact provides that the unappropriated flow of the Belle Fourche River shall be apportioned 10 percent to Wyoming and 90 percent to South Dakota, provided that Wyoming shall have unrestricted use of the water for domestic and stock purposes. The apportioned flow to South Dakota is the principal irrigation water source for the Belle Fourche Project.
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