First LIFE magazine cover, dated Nov. 23, 1936, with logo and picture of Fort Peck Dam by Margaret Bourke-White.

The Fort Peck Dam is the highest of six major dams along the Missouri River, located in northeast Montana in the United States, near Glasgow, and adjacent to the community of Fort Peck. At 21,026 feet (6,409 m) in length and over 250 feet (75 m) in height, it is the largest hydraulically filled dam in the United States, and creates Fort Peck Lake, the fifth largest man-made lake in the U.S. It lies within the Charles M. Russell National Wildlife Refuge. The dam and 134-mile (216 km) long lake exist for the purposes of hydroelectric power generation, flood control, and water quality management.