Keyhole Reservoir

Quick Facts

Keyhole Reservoir


(307) 756-3596

Map Directions

Things To Do


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-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.

Map of Keyhole Reservoir

Latitude, Longitude: 44.359792, -104.830828



  • Boating

    When the reservoir is full, it is open to boating.

  • Camping

    Camping is available in Keyhole State Park.

  • Fishing

    Walleye, catfish, small mouth bass and northern pike are available.

  • Hiking

    Hiking trails abound in Keyhole State Park.

  • Hunting

    Follow Wyoming regulations.

  • Picnicking

    Picnic areas are located around the reservoir.

  • RVing

    RV's can park in Keyhole State Park.

  • Water Sports

    When the reservoir is full, there is easy access to the water. Please contact the park for information about specific sports.


Open year-round.



Eight miles north off I-90 (Exit 165) between Moorcroft and Sundance. About 40-miles west of Belle Fourche, South Dakota.

Phone Numbers


(307) 756-3596