Fort Peck Lake

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Fort Peck Lake, or Lake Fort Peck, is a major reservoir in Montana, formed by the Fort Peck Dam on the Missouri River. The lake lies in the eastern prairie region of Montana approximately 140 miles (230 km) east of Great Falls and 120 miles (190 km) north of Billings, reaching into portions of six c

ounties. The dam and reservoir were built in the 1930s to enhance navigation on the Missouri River, supplying enough water downstream of the dam to provide for a 9-foot deep (2.7 m), 300-foot wide (91 m) navigation channel from Sioux City, Iowa, to the mouth of the Missouri just above St. Louis.

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