17 miles upstream from the town of Libby towers the Libby Dam, Montana's largest dam at 422 feet tall and 3,055 feet long. The dam creates the 90 mile long reservoir known as Lake Koocanusa which extends 42 miles into British Columbia, Canada and has a maximum depth of 370 feet. The dam, built in 1975, was named for a treaty developed between the Kootenai Indians, the Canadian government and the US government (KOO-CAN-USA).
Libby Dam is open to visitors year round and can be accessed on the southern side of the Lake Koocanusa Scenic Byway or by the visitors center on the west side of the Kootenai River. In addition to the breathtaking beauty of the surrounding mountains and sheer scale of the dam, the waters above and below the dam offer world-class fishing, boating and rafting.