Guernsey State Park is a public recreation area surrounding the Guernsey Reservoir, an impoundment of the North Platte River, one mile northwest of the town of Guernsey in Platte County, Wyoming, USA. The state park has campgrounds, boat ramps and hiking trails as well as exceptional examples of structures created by the Civilian Conservation Corps in the 1930s. Facilities are managed for the Bureau of Reclamation by the Wyoming Division of State Parks and Historic Sites.