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The Kootenai River has its origins in British Columbia's Kootenai National Park in Canada. From there it flows 485 miles into northwest Montana and through the towns of Libby and Troy. From there it flows into northern Idaho, then back into Canada and Kootenai Lake. Ultimately it joins with the Columbia River. Sixteen miles north of Libby, the river is held back by Libby Dam, creating a 90-mile long reservoir called Lake Koocanusa, which reaches into Canada.

Source:

http://www.libbymt.com/areaattractions/kootenairiver.htm