Angostura Dam, Black Hills National Forest

Angostura Dam is an embankment dam across the Cheyenne River in Fall River County in southwestern South Dakota in the United States, about 75 miles south of Rapid City. The dam consists of an earth-fill embankment with a concrete spillway section, 193 feet high and 2,030 feet long; it withholds the 195,121-acre-foot Angostura Reservoir. The dam was conceived as early as 1913, but it was not until the 1930s when a regional drought caused crop failures that the project received widespread support from farmers. Built from 1946 to 1949, the dam is part of the Angostura Division of the Pick-Sloan Missouri Basin Program, and is operated by the U.S. Bureau of Reclamation. ()