Dams in Lewis and Clark County, Montana
30Total Dams
11High Hazard
2Significant
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Canyon Ferry Dam | High | Not Available | 225 | Flood Risk Reduction | 1954 |
| Hauser Dam | High | Satisfactory | 125 | Hydroelectric | 1911 |
| Holter Dam | High | Satisfactory | 124 | Hydroelectric | 1918 |
| Three Mile Reservoir (l.&c.) | High | Poor | 70 | Irrigation | 1926 |
| Chessman Main Dam | High | Fair | 57 | Water Supply | 1908 |
| Nilan North Dam | High | Satisfactory | 54 | Irrigation | 1951 |
| Nilan East Dam | High | Satisfactory | 51 | Irrigation | 1951 |
| Hinman Dam | High | Not Rated | 34 | Other | 2000 |
| Scott Reservoir | High | Fair | 32 | Water Supply | 1952 |
| Helena Valley Dike | High | Not Available | 30 | Irrigation | 1959 |
| Willow Creek Bor Mt-dike 3 | High | Not Available | 3 | 1941 | |
| Smith Lake | Significant | 15 | Fire Protection, Stock, Or Small Fish Pond | 1954 | |
| Gravelly Range Lake | Significant | 12 | Irrigation | 1964 | |
| J B Long And Company #3 | Low | 34 | Irrigation | 1950 | |
| Soap Creek | Low | 25 | Irrigation | 1950 | |
| Deerborn Reservoir | Low | 20 | Irrigation | 1900 | |
| Curran-barrett #2 | Low | 20 | Irrigation | 1899 | |
| Thompson, Frank | Low | 20 | Irrigation | 1972 | |
| Evans, L. | Low | 20 | Fire Protection, Stock, Or Small Fish Pond | 1961 | |
| J B Long And Company #2 | Low | 20 | Fire Protection, Stock, Or Small Fish Pond | 1930 | |
| Detergent | Low | 15 | Fire Protection, Stock, Or Small Fish Pond | 1956 | |
| Krezelok | Low | 15 | Irrigation | 1945 | |
| Anderson Lake | Low | 15 | Fire Protection, Stock, Or Small Fish Pond | 1956 | |
| Curran-barrett #1 | Low | 15 | Irrigation | 1940 | |
| Flat Milford Colony | Low | 15 | Fire Protection, Stock, Or Small Fish Pond | 1955 | |
| Herrin Lake | Low | 15 | Fire Protection, Stock, Or Small Fish Pond | 1949 | |
| Milford Colony | Low | 15 | Fire Protection, Stock, Or Small Fish Pond | 1963 | |
| Wood Lake Dam | Low | Not Rated | 13 | Other | 1955 |
| Really Red | Low | 10 | Fire Protection, Stock, Or Small Fish Pond | 1953 | |
| Porrini | Low | 10 | Irrigation | 1952 |