Keyhole

Keyhole State Park encompasses approximately 14,720 acres surrounding Keyhole Reservoir on the western edge of the Black Hills in northeastern Wyoming. Created with the completion of Keyhole Dam on the Belle Fourche River in 1952, the park offers excellent warm-water fishing, diverse wildlife viewing, and expansive prairie landscapes. Located between Sundance and Moorcroft off Interstate 90, the park provides accessible recreation for regional visitors.

The park supports diverse wildlife including mule deer, white-tailed deer, pronghorn antelope, and wild turkeys. The warm-water reservoir produces excellent walleye, smallmouth bass, northern pike, and channel catfish. Over 225 bird species have been documented, making the park a significant birding destination. The prairie-reservoir interface creates habitat diversity supporting numerous species.

Vegetation reflects the transition between Great Plains grasslands and Black Hills forests. Ponderosa pine occurs on rocky ridges while mixed-grass prairie covers rolling uplands. Cottonwoods and willows line tributaries feeding the reservoir. Sagebrush and various prairie forbs provide habitat diversity. The varied plant communities support the exceptional bird and wildlife diversity.

Keyhole Reservoir fills a portion of the Belle Fourche River valley at the western margin of the Black Hills uplift. The surrounding terrain includes exposures of Cretaceous and Tertiary sedimentary rocks. The Belle Fourche River drains a large area of northeastern Wyoming before entering the reservoir. The Bureau of Reclamation constructed Keyhole Dam for irrigation water storage.

The park experiences a semi-arid continental climate with warm summers and cold, sometimes harsh winters. Elevation of approximately 4,100 feet at the reservoir allows summer temperatures to reach 90 degrees or higher. Winter temperatures frequently drop below zero. Annual precipitation averages about 16 inches, with thunderstorms common in late spring and summer.

The Belle Fourche River valley served as hunting territory for Native American peoples including the Lakota, Cheyenne, and Crow. The region saw significant conflict during the Plains Indian Wars of the 1870s. Ranching became the dominant land use following Euro-American settlement. The Bureau of Reclamation constructed Keyhole Dam between 1950 and 1952 for irrigation.

Keyhole State Park was established following completion of the dam to provide recreational facilities on the new reservoir. The park has developed ten campgrounds and extensive facilities to accommodate growing visitation. A proposed visitor center at Coulter Bay would enhance interpretation and visitor services. The park manages lands surrounding the Bureau of Reclamation reservoir.

Water recreation including boating, fishing, waterskiing, and swimming draws visitors throughout the warm season. The reservoir's 14,000 acres provide ample space for various watercraft. Prairie trails offer hiking and wildlife viewing. Ice fishing attracts winter visitors. The park's proximity to Devils Tower National Monument makes it a popular base for regional exploration.

Ten campgrounds provide numerous sites with varied amenities from primitive to electric hookups. Three group shelters accommodate events and gatherings. Multiple boat ramps provide reservoir access. The park is easily accessible from Interstate 90 at exit 165, about six miles north. Year-round camping is available, though some facilities close seasonally. Sundance and Moorcroft provide services.

Fishery management cooperates with Wyoming Game and Fish Department to maintain productive warm-water populations. The park's high bird diversity has attracted conservation interest. Invasive species monitoring protects reservoir ecosystems. The park demonstrates successful integration of irrigation infrastructure with recreation and wildlife habitat management.