Holter Dam
dam in Lewis and Clark County, Montana, U.S.
Holter Dam is a hydroelectric straight gravity dam on the Missouri River about 45 miles (72 km) northeast of Helena, Montana, in the United States. The dam, which was built between 1908 and 1918, is 1,364 feet (416 m) long and 124 feet (38 m) high. The reservoir formed by the dam, Holter Lake (also known as Holter Reservoir) is 25 miles (40 km) long and has a storage capacity of 243,000 acre-feet (300,000,000 m3) of water when full. The dam is a "run-of-the-river" dam because it can generate electricity without needing to store additional water supplies behind the dam.
Dam and lake
Holter Dam
Holter Dam was built by the United Missouri River Power Company and the Montana Power Company. Samuel Thomas Hauser, a former Territorial Governor of the state of Montana from 1885 to 1887, had had a lengthy career in banking, mining, railroads, ranching, and smelting, but had encountered a series of financial setbacks after the Panic of 1893 which had nearly ruined him financially. In his early 60s, Hauser began to rebuild his finances by branching out into the relatively new industry of hydroelectric power generation. In 1894, he formed the Missouri River Power Company, and won the approval of the United States Congress to build a dam 2 miles (3.2 km) below Stubbs' Ferry (which later was known as Hauser Dam). In 1905, Hauser and other directors of the Missouri River Power Company formed the Helena Power Transmission Company (also known as the "Helena Power and Transmission Company"). The two companies merged on February 16, 1906, to form the United Missouri River Power Company.
Begin with the source’s own compact description: “Holter Dam” is dam in Lewis and Clark County, Montana, U.S. The dossier treats that line as a proposition to test through Holter, Lewis and Clark, not as a finished interpretation.
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The phrase “dam in Lewis and Clark County, Montana, U.S” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Maps, plans, fabric surveys and administrative records can establish how the site’s name, extent and function changed over time. The source revision retrieved here is dated Jul 6, 2025. The linked authority identifier is Q12060451. VIAF identifies the subject as 315528811. Authority coordinates are 46.992, -112.006. 1 of 2 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1908, 1918, 1885 and 1887.
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This entry incorporates text from “Holter Dam” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.