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Keyhole State Park is a public recreation area located on the eastern shore of Keyhole Reservoir in Crook County, Wyoming.

Visual Characteristics

The park features a semi-arid landscape characterized by rolling hills and exposed rock formations. The reservoir itself is a large body of water with varying depths. Vegetation consists primarily of native grasses, sagebrush, and scattered ponderosa pines.

Location & Access Logistics

Keyhole State Park is situated approximately 10 miles east of Moorcroft, Wyoming, accessible via Interstate 90. Take Exit 186 and follow the signs for Keyhole State Park. The park entrance is directly off State Highway 111. Ample parking is available at designated areas throughout the park, including near the marina and campgrounds. No public transport services are available to the park.

Historical & Ecological Origin

Keyhole Reservoir was created by the construction of the Keyhole Dam, completed in 1952. The dam impounds water from the Belle Fourche River. The surrounding land is part of the Great Plains physiographic region, shaped by geological processes over millions of years.

Key Highlights & Activities

Activities include boating, fishing for walleye, northern pike, and crappie, and swimming. Hiking trails are available for exploration. The park also offers opportunities for camping and picnicking.

Infrastructure & Amenities

Restrooms and potable water are available at various locations within the park. Shade structures are present in designated picnic areas. Cell phone signal (4G) is generally available in most areas of the park. Food vendors are not present within the park; visitors should bring their own supplies.

Best Time to Visit

The best time for water-based activities is from late spring through early fall (May to September). For hiking and general exploration, mornings and late afternoons in spring and fall offer more moderate temperatures. Photography is best in the early morning or late afternoon for optimal natural light on the landscape.

Facts & Legends

The reservoir is named after a distinctive rock formation known as "Keyhole Arch," which was submerged when the reservoir was filled. A local legend suggests that the arch was once a portal to another realm, though this is unsubstantiated.

Nearby Landmarks

• Devils Tower National Monument (45km Northwest)
• Bear Lodge Mountains (40km West)
• Thunder Basin National Grassland (20km South)
• Aladdin Ghost Town (30km Northeast)