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The county was named for the local topography Valley County is one of 56 counties in Montana. The estimated population is 7,270.

Valley County is a county located in the U.S. state of Montana. The population is 7,675. Its county seat is Glasgow.
The towns Fort Peck Frazer Glasgow Nashua Opheim St. Marie
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-make 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.
 Authorized by U.S. President Franklin D. Roosevelt in 1933, construction of Fort Peck Dam employed over 11,000 workers at its peak in 1939. The dam, named for a 19th-century trading post, was completed in 1940, and began generating electricity in July 1943. The town of Fort Peck, Montana originally developed as a boomtown during the dam's construction. In addition to Fort Peck, other towns sprang up to house the workers. Among these were Wheeler and McCone City as well as more than a dozen other
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