Keyhole Unit of the Pick-Sloan Missouri Basin Program, consists of Keyhole Dam and Reservoir and is on the Belle Fourche River about 17 miles northeast of Moorcroft, Wyoming. French trappers settled in the vicinity of Belle Fourche and engaged in fur trading as early as 1854. Settlement in the area began with the gold rush to the Black Hills in 1876. Livestock became the principal industry in the general area. The Chicago and Northwestern Railroad reached the city of Belle Fourche in 1891 and for the remainder of the 19th century, the city was considered the largest original shipping point for livestock in the U.S.The reservoir has over 9,000 surface acres and 53 miles of shoreline. Public use area, camping, picnic areas, trailer dump station, concession, swimming, boating, hiking, and fishing. Available species include walleye, bass, and northern pike. Open all seasons.

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