The Clearwater River is a major waterway in north-central Idaho, originating in the Bitterroot Mountains near the Idaho-Montana border and flowing westward for approximately 75 miles to its confluence with the Snake River at Lewiston. The river system is composed of three main forks - the North Fork, South Fork, and Middle Fork - which come together to form the mainstem Clearwater. The North Fork Clearwater, originating in the Bitterroot Mountains, flows southwest for about 135 miles before joining the mainstem. It offers challenging whitewater in its upper reaches, particularly in the remote Black Canyon section. The South Fork Clearwater flows northwest for about 100 miles through rugged terrain before its confluence near Kooskia. The Middle Fork is formed by the joining of the Lochsa and Selway rivers near Lowell.

Paddling opportunities abound throughout the Clearwater system, with difficulty levels ranging from placid Class I floats to expert Class V rapids. The Middle Fork from Lowell to Kooskia offers a gentle 22-mile stretch suitable for all skill levels, featuring mostly Class I-II rapids. In contrast, the South Fork's Mickey Mouse section near Grangeville provides intense Class IV whitewater over 5.8 miles. The North Fork's upper reaches contain technical Class III-V rapids, while its lower sections offer more moderate paddling.

The best paddling season typically runs from late spring through early fall, with peak flows occurring in May and June during snowmelt. Late summer and early fall provide more moderate water levels suitable for a wider range of paddlers.

The Clearwater's ecosystem supports diverse wildlife, including elk, deer, black bears, and numerous bird species. The river is renowned for its exceptional westslope cutthroat trout fishing, particularly in tributaries like Kelly Creek. Key access points include Lowell at the Lochsa-Selway confluence, Kooskia, and Orofino. The river passes through the Nez Perce-Clearwater National Forests, offering numerous campgrounds and recreational facilities.

Historically, the Clearwater River held great significance for the Nez Perce tribe and played a role in the Lewis and Clark expedition. Today, it's part of the Northwest Discovery Water Trail, a 367-mile recreational boating route.

Safety considerations include swift currents, cold water, and remote sections with limited access. Paddlers should be aware of their skill levels and the river's difficulty ratings. Multi-day trips are possible, particularly on the gentler Middle Fork section, allowing for a more immersive wilderness experience in this scenic Idaho river system.