Lake Koocanusa
 Lake Koocanusa is a reservoir in British Columbia (Canada) and Montana (United States) formed by the damming of the Kootenay River by the Libby Dam in 1975.The lake is formed north of the dam reaching 48 miles (77 km) to the Canadian border and 42 miles (68 km) further into British Columbia. The lake holds 13% of the water in the Columbia River system. The town of Rexford was moved as well as the Great Northern Railroad line. The town of Waldo BC is now covered by the lake.