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Guernsey State Park(GuSP) is a 6000 acre state park surrounding Guernsey reservoir that provides a variety of water recreation, day use and overnight camping opportunities. The rugged and scenic landscape of the park offers scenic vistas and overlooks, hiking and biking trails, rock climbing and wildlife viewing opportunities. In addition to the unlimited number outdoor recreation activities that can be found at GuSP the park is also a National Historic Landmark. GuSP provides one of the finest examples of Civilian Conservation Corps (CCC) work in the Rocky Mountain area. While the park has long been known as a haven for boating, camping, hiking and picnickings activities it’s real treasure may lie in the exceptional CCC work that can be seen throughout the park. CCC projects in the project include hiking trails, bridges, roadways, overlooks and buildings. The Guernsey Museum and the “Castle” are just two of the must-see Guernsey CCC structures and facilities that can be found at this unique and beautiful park.


Workers finished building a dam across the North Platte River in 1927 creating Guernsey Reservoir. The reservoir and the thousands of acres surrounding the reservoir provided the backdrop and the perfect natural canvas for the Bureau of Reclamation and the Civilian Conservation Corp to develop a park. The CCC worked at Guernsey State Park from 1934- 1937 and took a rugged and undeveloped landscape and turned it into the unique and picturesque park that we see today. The park came under state management in 1957 and is one of the many sites currently operated and managed by the Wyoming State Parks, Historic Sites and Trails Division (SPHS&T).


Site Status



Reclamation Announces End of Season Operation of Guernsey Reservoir


  • Bureau of Reclamation will begin drawing down Guernsey Reservoir on the evening of Monday, September 11th.
  • The boat ramps will slowly become unuseable.
  • Reclamation advises all watercraft be removed by September 13th. 

Glendo and Guernsey state parks have banned open fires until further notice. Click here to find out more!

Only propane cooking appliances can be used. 


The annual Guernsey Reservoir silt run will begin the evening of July 4 and the boat ramps are expected to no longer be usable by July 8.

Guernsey State Park is open all year.



  • Guernsey State Park is open all year. Since we do have overnight camping the park is open 24 hours per day with the appropriate permits.
  • The Guernsey Museum is a seasonal facility that is open from May 1st through September 30. Visitors may visit the Museum between the hours of 9:00a.m. - 5:00p.m..

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