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Thompson Falls Dam is a dam in
Sanders County, Montana Sanders County is a county in the U.S. state of Montana. As of the 2020 census, the population was 12,400. Its county seat is Thompson Falls. The county was founded in 1905. It has an annual county fair with rodeo at Plains. Geography Acc ...
, in the northwestern part of the state. A complex of four hydropower dams stand on the
Clark Fork River The Clark Fork, or the Clark Fork of the Columbia River, is a river in the U.S. states of Montana and Idaho, approximately long. The largest river by volume in Montana, it drains an extensive region of the Rocky Mountains in western Montana and ...
in downtown
Thompson Falls, Montana Thompson Falls is a city in and the county seat of Sanders County, Montana. The population was 1,336 at the time of the 2020 census. History Thompson Falls was named after British explorer, geographer and fur trader David Thompson, who founde ...
: *Main Channel Dam (), high *Dry Channel Dam (), high *Intake Dam A (), high *Intake Dam B (), high Operations here began in 1915 with original construction on a set of natural falls. Today, the four dams together impound an upstream reservoir, with a water storage capacity of , and a seven-unit hydroelectric generation capacity of 94 megawatts.
Montana Power Company The Montana Power Company (MPC) was an electric utility company based in Butte, Montana, which provided electricity to Montana consumers and industry from 1912 to 1997. History The Montana Power Company was founded in 1912 by John D. Ryan, the ...
originally built the dam,
PPL Corporation PPL Corporation is an energy company headquartered in Allentown, Pennsylvania in the Lehigh Valley region of eastern Pennsylvania. The company is publicly traded on the New York Stock Exchange. History Pennsylvania Power & Light was founded in 1 ...
purchased it in 1997 and sold it to
NorthWestern Corporation NorthWestern Corporation owns NorthWestern Energy, a utility company that serves South Dakota, Nebraska, and Montana that is based in Sioux Falls. , the company serves approximately 718,000 customers. The company's corporate headquarters are loc ...
in 2014. The island between the dams contains a public park with hiking trails, picnic tables, and scenic overlooks. The site and adjacent buildings comprise the
Thompson Falls Hydroelectric Dam Historic District Thompson Falls Hydroelectric Dam Historic District is an historic district in Thompson Falls which includes six contributing buildings. It is located on the Clark Fork River, on alternate U.S. Route 10, within the northwestern part of Thompso ...
, on the National Register of Historic Places.


References

{{Authority control Dams in Montana Reservoirs in Montana NorthWestern Corporation dams Buildings and structures in Sanders County, Montana Landforms of Sanders County, Montana Dams completed in 1915 1915 establishments in Montana Thompson Falls, Montana