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Deerfield Dam
Country United States
Location Black Hills National Forest in Pennington County, South Dakota
Coordinates 44°01′46″N 103°47′05″W / 44.029480°N 103.784830°W / 44.029480; -103.784830Coordinates: 44°01′46″N 103°47′05″W / 44.029480°N 103.784830°W / 44.029480; -103.784830
Purpose Irrigation and Municipal Water Supply
Status Operational
Construction began 1942
Opening date 1947
Dam and spillways
Impounds Castle Creek
Height 171 ft.
Reservoir
Creates Deerfield Reservoir

Deerfield Dam is a dam impounding Castle Creek in the Black Hills of South Dakota. The dam creates Deerfield Reservoir within the Black Hills National Forest.

The earthen dam was originally built by the United States Bureau of Reclamation in 1942–1947, with a height of 171 feet, to store irrigation water for the surrounding Pennington County. Construction was started in July 1942 by the Farm Security Administration, and later continued by the Civilian Conservation Corps under the Works Projects Administration during World War II. Employment of conscientious objectors under the Civilian Public Service here drew complaints from locals.

The reservoir has a capacity of 15,700 acre-feet and covers 414 acres of surface. Along with providing irrigation and recreation such as ice fishing and ice skating, the reservoir also supplements the municipal water supply of Rapid City, South Dakota and for the nearby Ellsworth Air Force Base.

Today, several recreational areas and campgrounds operated by the National Forest Service offer public recreational opportunities to the lake area.

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