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Fort Peck Dam

Fort Peck, Montana
Constructed 1933-1940

Claim to Fame: The Fort Peck Dam was more than five times larger than the largest dam in the world at the time, with its crest extending four miles.

Fort Peck Dam
Courtesy Flickr/US Army Corps of Engineers

The Fort Peck Dam was a cornerstone project of the Works Progress Administration of Franklin D. Roosevelt's New Deal. It required the largest construction plant and workforce since the construction of the Panama Canal and peaked at 11,000 workers. It was the largest dam of any type in the world for over 30 years.

The record-setting, hydraulic-filled structure required the excavation of over 14 million cubic yards of earth, mixing it with water and then transporting it to the site. Its steel sheetpile foundations, installed to prevent water from seeping through the earth under the dam, extended to a record depth of 163 feet.