The Selway River is a perennial river located in the north‑central region of the U.S. state of Idaho. It is a tributary of the Middle Fork of the Clearwater River, which ultimately joins the Snake River and the Columbia River drainage basin.
Geography
- Source: The river originates in the Selway‑Bitterroot Wilderness of the Bitterroot Mountains, near the border with Montana, at an elevation of approximately 5,000 feet (1,524 m) above sea level.
- Course: From its headwaters the Selway flows generally southwest for about 97 miles (156 km) through the Selway National Forest and the Nez Perce National Forest. The river traverses rugged canyons and densely forested valleys before reaching its confluence with the Middle Fork of the Clearwater River near the community of Orofino.
- Mouth: The Selway joins the Middle Fork of the Clearwater River at an elevation of roughly 1,200 feet (366 m).
- Drainage Basin: The Selway River watershed encompasses roughly 1,100 square miles (2,850 km²) of mountainous terrain.
Hydrology
The Selway exhibits a typical alpine flow regime, with peak discharges in late spring and early summer driven by snowmelt, and lower flows in late summer and winter. Seasonal variation supports a diverse aquatic ecosystem, including cold‑water fish species.
Ecology
The river and its surrounding riparian habitats host a variety of wildlife. Notable species include:
- Fish: Populations of wild steelhead (Oncorhynchus mykiss), Pacific salmon (Oncorhynchus spp.), and trout (Salmo trutta and Oncorhynchus clarkii) are present, making the river a significant spawning and rearing habitat.
- Mammals: The watershed supports elk, mule deer, black bear, and gray wolf, among other mammals.
- Birds: Riparian zones provide nesting and foraging areas for species such as the bald eagle, osprey, and various waterfowl.
Conservation and Management
In 1978 the Selway River was designated a National Wild and Scenic River under the Wild and Scenic Rivers Act. The designation classifies the majority of the river as “wild,” preserving its free‑flowing condition, water quality, and outstanding natural, cultural, and recreational values. Management responsibilities are shared among the U.S. Forest Service, the Idaho Department of Fish and Game, and federal agencies overseeing the wilderness and national forest lands.
Human Use and Recreation
- Recreation: The Selway River is renowned for backcountry fishing, white‑water boating, and wilderness trekking. Its remote character limits motorized access, and most recreation occurs via foot, horseback, or non‑motorized watercraft.
- Cultural History: Indigenous peoples, including the Nez Perce, have historically utilized the Selway watershed for hunting, fishing, and travel. European‑American exploration and settlement in the late 19th century introduced limited logging and mining activities, which have since been largely curtailed under federal protection.
Infrastructure
There are no major dams or diversions on the Selway River; its natural flow is largely uninterrupted. Limited road access exists primarily for forest service operations and limited public entry points near its lower reaches.
References
- United States Geological Survey (USGS) topographic maps and hydrologic data.
- National Wild and Scenic Rivers System, U.S. Department of the Interior.
- Idaho Department of Fish and Game, fish population surveys.
This entry reflects the current state of publicly available, verifiable information about the Selway River.