Red Rock River
Near Dillon, Montana
The Red Rock River flows from the Centennial Valley near the Idaho border through remote ranch country to join the Beaverhead River at Clark Canyon Reservoir. This small river is the uppermost tributary of the Missouri River system and offers good fishing for brown and rainbow trout in a peaceful, uncrowded setting. The upper river near Red Rock Lakes National Wildlife Refuge provides habitat for trumpeter swans and other wildlife alongside fishing opportunities. Access is challenging through private ranch land, with Red Rock Road providing the primary route into the valley. The river fishes best from late spring through fall, with standard freestone hatches of mayflies, caddis, and terrestrials. The remote Centennial Valley offers stunning scenery and a glimpse into Montana's ranching heritage. This is exploratory fishing for anglers seeking solitude and willing to navigate limited access in exchange for uncrowded water and beautiful surroundings.