U.S. Route 91

U.S. Route 91 or U.S. Highway 91 (US 91) is a north–south United States highway that goes from Interstate 15/Interstate 84 in Brigham City, Utah, to I-15 Business/US 26 in Idaho Falls, Idaho. In the past, the highway went from Long Beach, California, to the Canada–US border north of Sweetgrass, Montana. As I-15 was being built from San Diego, California to Sweetgrass, people used US 91 less.