Largest State Park in Wyoming, and Reservoir.

The first white men through the Wind River Canyon were the Ashley Fur Party in 1825. The original dam was built by Asmus Boysen in 1908, for whom the park and reservoir are named. Part of the original dam can still be seen adjacent to the tunnels in the Lower Wind River Campground. Mr. Boysen also built a 710kw power plant at the site.

Operations ceased when in 1923 a major flood filled the plant with silt. The CB&O Railroad went through the canyon in 1911 and the state highway went through in 1925. The existing dam was completed in 1951.

Boysen became a state park in 1956


Boysen State Park Wyoming
120 Boysen Dr, Shoshoni, WY 82649, United States



Grounds open all year – 24 hours.


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Contact Details

Phone: 307-876-2796


Official Website: Boysen State Park Wyoming


Area Attractions

Suggested Equipment for Boysen State Park Adventures:


The following activities within the park should be done with utmost caution. Make sure that you have the proper protective gear and equipment necessary to make your adventures safe and accident-free. We advise you to read the TIPS underneath each activity to serve as a guide on what you may need to bring in order to enjoy your stay fully.

Activities & Tips


Boysen State Park is a must-visit state park in Wyoming. Check out other state parks in Wyoming here.

Wyoming State Parks