The Clearwater River is a major tributary of the Snake River located in north‑central Idaho, United States. It drains a watershed of roughly 13 000 sq mi (34 000 km²) within the larger Columbia River basin and is noted for its clear water, extensive forested surroundings, and significant ecological and cultural history.
Geography
The main stem of the Clearwater River is formed by the confluence of the North Fork Clearwater River and the South Fork Clearwater River near the community of Orofino. From this junction the river flows generally westward for approximately 73 mi (117 km) before joining the Snake River at Lewiston, the lowest point on the North American continental divide. The river’s elevation drops from about 1 500 ft (460 m) at its source to 741 ft (226 m) at its mouth.
Key tributaries include:
- North Fork Clearwater River – originates in the Bitterroot Mountains and passes through Dworshak Reservoir, created by Dworshak Dam.
- South Fork Clearwater River – flows from the Selway Mountains through a deep canyon before meeting the North Fork.
- Middle Fork Clearwater River – enters the main stem near Grangeville.
- Selway River – joins the North Fork near Lowell.
The river basin encompasses portions of the Clearwater, Nez Perce, and Idaho Counties and is largely situated within the Nez Perce and Clearwater National Forests.
Hydrology and Water Management
The Clearwater River’s flow is regulated in part by the Dworshak Dam on the North Fork, the largest hydroelectric dam in Idaho. Seasonal discharge averages around 13 500 cfs (382 m³/s), with higher flows during spring snowmelt. Water quality is generally high, supporting diverse aquatic habitats.
Ecology
The Clearwater River watershed supports a range of fish species, notably steelhead (Oncorhynchus mykiss), Chinook salmon (Oncorhynchus tshawytscha), and various trout species. Riparian zones are dominated by Western Redcedar (Thuja plicata), Douglas‑fir (Pseudotsuga menziesii), and a variety of understory vegetation. The river and its tributaries provide critical habitat for wildlife such as elk, black bear, and the threatened Coeur d’Alene salamander (Ambystoma maculatum).
History and Cultural Significance
For millennia the Clearwater River valley was inhabited by the Nez Perce people, who relied on its fish and transportation routes. The river was documented by the Lewis and Clark Expedition in 1805–1806, when the explorers traveled upstream along its clear waters, giving the river its present name. In the 19th and early 20th centuries, the river corridor facilitated timber extraction, mining, and limited steamboat navigation.
Recreation and Use
The Clearwater River is a popular destination for recreation, including fly‑fishing, white‑water kayaking, and boating. Public access points are managed by the U.S. Forest Service and state agencies. The river’s scenic canyons and surrounding forests attract hikers, wildlife observers, and tourists.
Conservation
Management of the Clearwater River involves coordination among federal, state, and tribal agencies to balance hydroelectric production, fish‑habitat protection, and recreational use. Conservation initiatives focus on maintaining water quality, restoring salmonid runs, and preserving riparian ecosystems.
See also
- Snake River
- Nez Perce National Historical Park
- Columbia River Basin
References
- United States Geological Survey (USGS) topographic and hydrographic data.
- Idaho Department of Fish and Game, fisheries reports.
- U.S. Forest Service, Clearwater National Forest management plans.