Clark Canyon Dam is an earthfill dam located in Beaverhead County, Montana, about 20 mi south of the county seat of Dillon. The dam impounds the waters of the Beaverhead River, creating a body of water known as Clark Canyon Reservoir. The structure was constructed in 1961-1964 by the United States Bureau of Reclamation, to hold water for downstream irrigation and for flood control purposes. Clark Canyon Dam has a crest length of 2,950 ft, and a maximum height of 147 ft. The dam contains 1,970,000 cubic yards (1,510,000 m³) of material. The elevation of the dam crest is 5,578 ft. The reservoir has a total capacity of 325324 acre.ft, and when full has a surface area of 5,903 acre. Construction of the dam and reservoir required the relocation of U.S. Route 91 (rebuilt as Interstate 15) and a main line of the Union Pacific Railroad. The reservoir inundated the former site of the small community of Armstead, Montana, and the site of Camp Fortunate, where the Lewis and Clark Expedition camped from August 17 to 22, 1805 and held negotiations with the Shoshone.

Fishing

Fishing is a popular activity on the reservoir created by the dam. The reservoir is regularly stocked with fish.