Interstate 15 (I-15) is a major highway in the western United States that goes from the Canadian to the Mexican border. The stretch in the state of Montana runs for 397.50 miles from Monida Pass at the Idaho state line to Sunburst close to the Canadian border. The highway passes through the counties of Monida Pass, Beaverhead, Madison, Silver Bow, Jefferson, Lewis and Clark, Cascade, Teton, Pondera, and Toole.
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