Browse Dams
3,029 dams in the National Inventory of Dams.
National Inventory of Dams
Browse 3,029 dams from the NID database. Each record includes dam name, location, physical dimensions, hazard potential classification, condition assessment, purpose, owner information, and emergency action plan status. Use the filters below to search by state, hazard level, condition, or keyword.
| Name | State | County | Height (ft) | Hazard | Condition | Year | Purpose |
|---|---|---|---|---|---|---|---|
| Big John M | Montana | Fergus | 52 | Low | — | 1972 | Irrigation |
| Big Sky Dam | Montana | Madison | 52 | High | Satisfactory | 1973 | Recreation |
| Jocko | Montana | Missoula | 51 | High | Poor | 1937 | Irrigation |
| Nilan East Dam | Montana | Lewis and Clark | 51 | High | Satisfactory | 1951 | Irrigation |
| Pishkun Dike 1 | Montana | Teton | 50 | High | Not Available | 1930 | Irrigation |
| Broadwater Dam | Montana | Broadwater | 50 | High | Satisfactory | 1940 | Hydroelectric |
| Stoyanoff | Montana | Meagher | 50 | Low | — | 1947 | Irrigation |
| Rosann Rosanna Dana | Montana | Sweet Grass | 50 | Low | — | 1939 | Other |
| Mccracken Brothers | Montana | Toole | 50 | Low | — | 1953 | Fire Protection, Stock, Or ... |
| Four Horns | Montana | Glacier | 50 | High | Satisfactory | 1915 | Irrigation |
| Doggett Reservoir | Montana | Meagher | 50 | High | Fair | 1948 | Irrigation |
| South Sandstone Creek Dam | Montana | Fallon | 49 | Significant | — | 1975 | Irrigation |
| Martinsdale, East Dam | Montana | Wheatland | 49 | High | Poor | 1939 | Irrigation |
| Basin Creek Dam #2 | Montana | Silver Bow | 49 | Significant | Poor | 1907 | Water Supply |
| Booth (Chouteau) | Montana | Chouteau | 48 | Low | — | 1961 | Irrigation |
| Ralph Clark #1 | Montana | Garfield | 47 | Low | — | 1955 | Fire Protection, Stock, Or ... |
| Thompson Falls - Dry Channel Dam | Montana | Sanders | 47 | Low | Satisfactory | 1915 | Hydroelectric |
| Mcdonald | Montana | Lake | 47 | High | Satisfactory | 1920 | Irrigation |
| Stauffer Chemical #1 | Montana | Silver Bow | 47 | Low | — | 1954 | Other |
| Pablo | Montana | Lake | 47 | High | Unsatisfactory | 1912 | Irrigation |
| South Side Detention Dam | Montana | Carbon | 47 | Low | Poor | — | Flood Risk Reduction |
| Browns | Montana | Chouteau | 47 | Low | — | 1986 | Fire Protection, Stock, Or ... |
| Gardner #1 (East Dam) | Montana | Carter | 46 | Low | — | 1962 | Irrigation |
| Frog | Montana | Blaine | 46 | Low | — | 1960 | Fire Protection, Stock, Or ... |
| Ix Ranch | Montana | Chouteau | 46 | Low | — | 1951 | Irrigation |
| Westermark | Montana | Toole | 45 | Low | — | 1964 | Recreation |
| Ernie Hudson | Montana | Stillwater | 45 | Low | — | 1928 | Irrigation |
| Taylor #2 | Montana | Garfield | 45 | Low | — | 1979 | Fire Protection, Stock, Or ... |
| Carson (Mn-66) | Montana | Blaine | 45 | Low | — | 1940 | Fire Protection, Stock, Or ... |
| Dramamine | Montana | Judith Basin | 45 | Low | — | 1967 | Fire Protection, Stock, Or ... |
| Mystic Lake | Montana | Stillwater | 45 | High | Satisfactory | 1927 | Hydroelectric |
| No 10 | Montana | Blaine | 45 | Low | — | 1930 | Fire Protection, Stock, Or ... |
| Shining Mountain | Montana | Ravalli | 45 | Low | — | 1972 | Fire Protection, Stock, Or ... |
| Green Hollow Creek Dam | Montana | Madison | 45 | High | Satisfactory | 1990 | Recreation |
| Dry Fork | Montana | Blaine | 45 | Significant | — | 1986 | Irrigation |
| German Bread | Montana | Blaine | 44 | Low | — | 1950 | Fire Protection, Stock, Or ... |
| Prairie Nest Ranch 3 | Montana | Cascade | 44 | Low | — | 1959 | Irrigation |
| Rainbow | Montana | Cascade | 44 | High | Satisfactory | 1910 | Hydroelectric |
| Bar Island Detention Dam | Montana | Phillips | 44 | Low | Poor | 1967 | Flood Risk Reduction |
| Bonanza | Montana | Meagher | 44 | Significant | — | 1938 | Irrigation |
| Colstrip Diversion Dam | Montana | Rosebud | 44 | High | Satisfactory | 1976 | Other |
| Bailey-Dees-Frey | Montana | Hill | 44 | Low | — | 1968 | Recreation |
| I.U. Reservoir | Montana | Blaine | 44 | Low | — | 1938 | Irrigation |
| Lake Creek | Montana | Lincoln | 44 | High | Satisfactory | 1917 | Hydroelectric |
| Peet Creek Dam | Montana | Beaverhead | 43 | Significant | — | — | Irrigation |
| Cow Creek | Montana | Blaine | 43 | Significant | — | — | Fish and Wildlife Pond |
| Taylor, Upper | Montana | Powell | 43 | High | Satisfactory | 1951 | Irrigation |
| Square Butte Detention Dam | Montana | Phillips | 42 | Low | Poor | 1967 | Flood Risk Reduction |
| Anita Dam | Montana | Blaine | 42 | High | Fair | 1995 | Irrigation |
| Anita Dam | Montana | Yellowstone | 42 | Low | Not Available | 1937 | Irrigation |
Frequently Asked Questions
Hazard potential is based on the consequences of dam failure, not the condition of the dam. High hazard means loss of human life is probable. Significant means economic and environmental losses are expected but no probable loss of life. Low means minimal losses are expected. The classification considers downstream population, infrastructure, and environmental resources.
Condition ratings reflect the physical state of the dam based on periodic inspections. Satisfactory means no deficiencies found. Fair means minor issues exist but no immediate action needed. Poor means safety deficiencies require remedial action. Unsatisfactory means the dam is unsafe and immediate corrective action is required.
Yes. Use the search field above to find dams by name. You can also combine the search with state, hazard, and condition filters to narrow your results. Each dam record links to a detail page with complete information.