Holter Dam

Holter Dam is a gravity dam on the Missouri River in Montana, approximately 415 meters long and 38 meters high. The structure backs up water to form Holter Lake, a large reservoir that stretches across the valley.

Construction of the dam began in 1908 by the United Missouri River Power Company and Montana Power Company under Samuel Thomas Hauser's direction. Its completion in 1916 provided reliable power to the growing region.

The facility displays early hydroelectric architecture built in the early 1900s, with stone structures and industrial buildings that shape the landscape. Visitors can see how the installation fits into the Missouri River valley and continues to influence daily life in the region today.

The site is accessible year-round, with summer being the best time when weather is stable. Visitors should wear sturdy shoes since paths around the facility can be uneven and sun exposure is strong.

During construction in 1916, the site housed a massive work camp with over 100 buildings. This camp sheltered hundreds of workers in dormitories and even operated its own hospital and dining facility.

Location: Lewis and Clark County

GPS coordinates: 46.99170,-112.00600

Latest update: December 9, 2025 18:41