Keyhole State Park, State park in Crook County, Wyoming, US.
Keyhole State Park is a recreation area in northeastern Wyoming built around the Keyhole Reservoir, offering campgrounds, hiking trails, and water-based activities. The park is organized into ten camping areas with a range of options from basic tent sites to RV hookups and rental cabins.
In the 1950s, the federal government built a dam in this area to manage flood risk and secure water supply for the region. The reservoir that formed behind the dam was later opened to the public as a state park.
Bird watchers come to the park throughout the year to take part in banding sessions where birds are caught, tagged, and released to track migration. More than 200 bird species have been recorded around the reservoir, making it a draw for anyone interested in wildlife.
The park is open year-round, but most facilities and camping areas operate only during the warmer months. It is worth checking which areas will be open before planning a visit, especially for those who want a specific type of site.
Even though the reservoir sits entirely in Wyoming, most of the water it holds is delivered to South Dakota under an interstate agreement. This makes it one of the rare cases where a state manages a reservoir whose water primarily serves another state.
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