Fort Peck Dam, dam on the Missouri River, northeastern Montana, U.S., one of the world’s largest earthfill dams. The dam is situated some 32 km (20 miles) southeast of Glasgow. A Public Works Administration project begun in 1933 and completed in 1940, it provides flood control, improved navigation, and hydroelectric power.
Fort Peck Dam is 76 metres (250.5 feet) high and 6,409 metres (21,026 feet) long. Its five turbines can generate 185,250 kilowatts of power. Fort Peck Lake, which the dam impounds, is the fifth largest constructed reservoir in the United States; it extends 216 km (134 miles). The entire Fort Peck system is contained within the Charles M. Russell National Wildlife Refuge.