The Stillwater River is a scenic and adventurous waterway in south-central Montana. Originating high in the Beartooth Mountains, it flows northeastward for approximately 70 miles before joining the Yellowstone River near Columbus. The West Fork Stillwater River is its primary tributary, merging near the town of Nye. The river offers diverse paddling opportunities across several distinct sections.

The upper reaches near Woodbine Campground feature challenging Class IV-V whitewater suitable only for expert kayakers. As it descends, the river mellows into more moderate Class II-III rapids through scenic canyons and forests. The lower sections provide enjoyable Class I-II floating for a wider range of skill levels. Paddling difficulty ranges from beginner-friendly floats to expert-level technical rapids. The most popular sections for rafting and kayaking are found between Nye and Columbus, with the stretch from Whitebird to Fireman's Point offering an exciting Class III run.

Spring runoff typically peaks in late May to early June, providing the highest water levels. Summer flows gradually decrease, with late July through September offering pleasant conditions for floating and fishing. Fall colors enhance the scenery in October, though water levels may be low.

The river corridor supports diverse wildlife, including deer, elk, black bears, and a variety of bird species. Cottonwood trees line the banks in many areas, while ponderosa pines dominate higher elevations.

Key access points include Woodbine Campground, Buffalo Jump Fishing Access, Moraine Fishing Access, Cliff Swallow Fishing Access, and Whitebird Fishing Access. The towns of Absarokee and Columbus serve as the primary gateways to the river.

The Stillwater River played a role in the region's mining history, with platinum and palladium still extracted nearby. Today, it's valued for its recreational opportunities and as a vital water source for local communities and agriculture.

Safety considerations include swift currents, cold water, and remote sections with limited access. Proper equipment and self-rescue skills are essential. Multi-day trips are possible, particularly on the lower river, allowing for a more immersive wilderness experience.