Boysen Reservoir is a Wyoming State Park that sits between Thermopolis and Riverton.

It’s water comes from the Bighorn River which originates in the Bighorn Mountains and eventually runs through Wind River Canyon.

There are 11 campground sites and there is a marina that rents watercraft. Fish species found here include walleye, perch, crappie, channel catfish, rainbow, and brown trout among others.