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