Libby Dam

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Aerial view Libby dam, upstream view, 1986
Aerial view Libby dam, upstream view, 1986

Libby Dam is a dam on the Kootenai River in the U.S. state of Montana. Dedicated on August 24, 1975. Libby Dam spans the Kootenai River 17 miles (27 km) upstream from the town of Libby, Montana. Libby Dam is 422 feet (129 m) tall and 3,055 feet (931 m) long. Lake Koocanusa is the name of the impoundment reservoir behind the dam. It extends 90 miles (145 km) upriver from the dam and has a maximum depth of about 370 feet (110 m). Forty-two miles (68 km) of Lake Koocanusa are in British Columbia, Canada. The Kootenai River is the third largest tributary to the Columbia river, contributing almost 20% of the total water in the lower Columbia. Libby Dam holds back 5.8 million acre feet (7.2 km³) of water.[citation needed]

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