Kootenay River

Kootenay River Kootenai River
The Kootenai River at Libby, Montana
Map of the Kootenay/Kootenai River, its main tributaries and lakes, and major cities.
Native name	aqkinmiluk (Kutenai) aqkoktlaqatl (Kutenai)
Location
Countries	Canada, United States
Province	British Columbia
States	Montana, Idaho
Physical characteristics
Source	South flank of Castle Mountain
• location	Mount Hungabee, Kootenay National Park, British Columbia, Canada
• coordinates	51°18′53.6″N 116°17′10.6″W / 51.314889°N 116.286278°W / 51.314889; -116.286278[1]
• elevation	2,261 m (7,418 ft)[1]
Mouth	Columbia River
• location	Castlegar, British Columbia, Canada
• coordinates	49°19′0″N 117°39′4″W / 49.31667°N 117.65111°W / 49.31667; -117.65111[2]
• elevation	420 m (1,380 ft)[3]
Length	780 km (480 mi)[4]
Basin size	50,298 km2 (19,420 sq mi)[3]
Discharge
• location	Columbia River at Castlegar, BC (rates given for Kootenay Lake near Corra Linn Dam[5][6] some 10 miles upstream)
• average	782 m3/s (27,600 cu ft/s)[5][6]
• minimum	104 m3/s (3,700 cu ft/s)
• maximum	4,930 m3/s (174,000 cu ft/s)
Basin features
Tributaries
• left	Palliser River, White River, Bull River, Elk River, Fisher River, Tobacco River, Lake Creek
• right	St. Mary River, Yaak River, Moyie River, Goat River, Duncan River, Slocan River

The Kootenay River^[7] or Kootenai River^[2] is a major river of the Northwest Plateau in southeastern British Columbia, Canada, and northern Montana and Idaho in the United States. It is one of the uppermost major tributaries of the Columbia River, the largest North American river that empties into the Pacific Ocean. The Kootenay River runs 781 kilometres (485 mi) from its headwaters in the Kootenay Ranges of the Canadian Rockies, flowing from British Columbia's East Kootenay region into northwestern Montana, then west into the northernmost Idaho Panhandle and returning to British Columbia in the West Kootenay region, where it joins the Columbia at Castlegar.

The river is known as the "Kootenay" in Canada and by the Ktunaxa Nation,^[7] and as the "Kootenai" in the United States and by the Confederated Salish and Kootenai Tribes and Kootenai Tribe of Idaho.^[2] Fed mainly by glaciers and snowmelt, the river drains a rugged, sparsely populated region of more than 50,000 km² (19,000 sq mi), of which over 70 percent is in Canada. From its headwaters to its confluence with the Columbia River, the Kootenay descends more than 2,000 metres (6,600 ft). At their confluence, the Columbia and Kootenay are similar in length, drainage area, and volume, but less of the Kootenay is impounded in reservoirs and thus it has more free-flowing stretches with rapids and falls. Part of the lower Kootenay forms Kootenay Lake, one of the largest natural lakes in British Columbia.

The Ktunaxa (Kootenai) were the first people to live along the Kootenay River. For hundreds of years, they hunted and fished on the river, quite isolated from neighboring tribes. In the 19th century, Canadian explorer David Thompson became the first recorded European to reach the Kootenay and established trading posts throughout the region. A gold rush followed by silver and galena strikes in the late 19th century drew thousands of miners and settlers to the region, bringing developments such as railroads and steamboat navigation. The Doukhobors, a Russian religious sect, established a short-lived colony, Brilliant, at the Kootenay's mouth; subsequently dispersing into many settlements, they contributed to the region's timber and agricultural industries.

As with many Pacific Northwest rivers, many dams were built on the Kootenay in the 20th century to generate electricity and protect against floods and droughts. Water levels of Kootenay Lake are artificially regulated, and numerous hydroelectric dams block the river between Kootenay Lake and the Columbia River. Upstream of Kootenay Lake, most of the river is free-flowing with the exception of the Libby Dam in Montana, which forms Lake Koocanusa.