Libby Dam
- Libby 59923,Northwest Montana,Lincoln County
- (406) 293-5577
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Libby Dam spans the Kootenai River 17 miles upstream from the town of Libby in the heart of beautiful northwestern Montana.
Libby Dam is 422 feet tall and 3,055 feet long. Lake Koocanusa is 90 miles long with a maximum depth of about 370 feet. Forty-two miles of Lake Koocanusa are in British Columbia, Canada.
The Kootenai River is the third largest tributary to the Columbia River, contributing almost 20 percent of the total water in the lower Columbia. Only the Snake and Pend Oreille/Clark Fork Rivers contribute more.
Libby Dam holds back 5.8 million acre-feet of water. An acre-foot of water is one acre of land covered with one foot of water, equaling 325,804 gallons. Spread out one foot deep, the lake would cover an area larger than the state of Massachusetts!
Surprisingly, Koocanusa is not an Indian name. Mrs. Alice Beers from Rexford, Montana, won a contest in 1971 to name the Libby Dam reservoir. She combined the first three letters from Kootenai River, the first three letters of Canada, and the USA.
Libby Dam is a “straight-axis, concrete gravity” structure solidly anchored in bedrock. “Straight-axis” means the dam is built straight across the river instead of
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