The portion of U.S. interstate highway 15 between Butte and Great Falls is established as the Maureen and Mike Mansfield heritage route.
Mont. Code Ann. § 60-1-204, under Classification of Highways.
Mont. Code Ann. § 60-1-204
The portion of U.S. interstate highway 15 between Butte and Great Falls is established as the Maureen and Mike Mansfield heritage route.