St. Marie is located 17 miles north of Glasgow. Nearby, Fort Peck Reservoir is Montana's largest body of water. The lake is about 134 miles in length and has 1,520 miles of shoreline which is longer than the California coast. The reservoir was created with the construction of the 3.5 mile Fort Peck Dam across the Missouri River. Surrounding this large expanse of water is the Charles M. Russell (CMR) National Wildlife Refuge, which provides over one million acres of public land for fishing, hiking, hunting, camping and bird-watching.