Tongue River Reservoir State Park 
290 Campers Point
Decker, MT 59025
406-234-0900
http://stateparks.mt.gov/tongue-river-reservoir/
State Park: Birding, Camp, Fish, Hike, Picnic, RV, Walk, Water Sports
The 12-mile long reservoir is situated among scenic red shale, juniper canyons, and the open prairies of southeastern Montana. The park is loved by Montana and Wyoming anglers, campers, and boaters. Water sports are popular here and the park boasts excellent fishing as four state record fish have been pulled from its waters. It’s remote, so plan accordingly.