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 |
|---|---|---|---|---|---|---|---|
| Jensen Dam | Montana | Garfield | 30 | Low | — | 1950 | Fire Protection, Stock, Or ... |
| Keep Cool | Montana | Meagher | 30 | Significant | — | 1950 | Irrigation |
| Brown Coulee (Rosebud) | Montana | Rosebud | 30 | Low | — | 1950 | Irrigation |
| Ayers | Montana | Meagher | 30 | Low | — | 1946 | Irrigation |
| Costich Dam | Montana | Lincoln | 29 | High | Satisfactory | 1956 | Irrigation |
| 20 Dam | Montana | Custer | 29 | Low | Poor | 2003 | |
| Porch #1 | Montana | Powder River | 29 | Low | — | 1961 | Fire Protection, Stock, Or ... |
| Valley Dam | Montana | Valley | 29 | Low | Not Rated | — | |
| Lower | Montana | Prairie | 29 | Low | — | 1962 | Fire Protection, Stock, Or ... |
| Ash Creek | Montana | Prairie | 29 | Low | — | 1951 | Irrigation |
| Storm Lake Dam | Montana | Deer Lodge | 29 | High | Poor | 1898 | Irrigation |
| Pr-137 King Retention Dam | Montana | Phillips | 29 | Low | Not Rated | 1937 | Flood Risk Reduction |
| Bison Bone Retention Dam | Montana | Phillips | 29 | Low | Not Rated | 1967 | Fire Protection, Stock, Or ... |
| Killen Dam | Montana | Rosebud | 29 | Low | — | 1970 | Fire Protection, Stock, Or ... |
| Saint Marys Diversion Dam | Montana | Glacier | 29 | Low | Not Available | 1915 | Irrigation |
| Pr-54 Retention Dam | Montana | Phillips | 29 | Low | Not Rated | 1936 | Fire Protection, Stock, Or ... |
| Kona Ranch | Montana | Missoula | 29 | Significant | — | 1959 | Irrigation |
| Volf, C. | Montana | Wheatland | 29 | Low | — | 1971 | Irrigation |
| Wilson (Judith Basin) | Montana | Judith Basin | 29 | High | Satisfactory | 1952 | Irrigation |
| Onion Head | Montana | Meagher | 29 | Low | — | 1955 | Irrigation |
| Get Down | Montana | Garfield | 29 | Low | — | 1952 | Irrigation |
| Whitetail Detention Dam | Montana | Valley | 29 | Low | Poor | 1965 | Fire Protection, Stock, Or ... |
| Sob Detention Dam | Montana | Valley | 29 | Low | Poor | 1966 | Flood Risk Reduction |
| Watters #1 | Montana | Powder River | 29 | Significant | — | 1966 | Irrigation |
| Christianson | Montana | McCone | 29 | Low | — | 1960 | Fire Protection, Stock, Or ... |
| Shale Creek | Montana | Petroleum | 29 | Low | — | 1957 | Irrigation |
| Griffin | Montana | Custer | 29 | Low | — | 1972 | Fire Protection, Stock, Or ... |
| Murky Retention Dam | Montana | Phillips | 28 | Low | Not Rated | 1966 | Fire Protection, Stock, Or ... |
| Rindal | Montana | Fergus | 28 | Low | Not Available | 1938 | Fire Protection, Stock, Or ... |
| Nelson Dike C | Montana | Phillips | 28 | High | Not Available | 1915 | Irrigation |
| Sister Sledge | Montana | Liberty | 28 | Low | — | 1960 | Fire Protection, Stock, Or ... |
| Watts #1 | Montana | Custer | 28 | Low | — | 1912 | Irrigation |
| Pfaff Irrigation | Montana | Prairie | 28 | Significant | — | 1957 | Irrigation |
| Frog Dam | Montana | Richland | 28 | Low | — | 1973 | Fire Protection, Stock, Or ... |
| Venn #1 | Montana | Custer | 28 | Significant | — | 1936 | Irrigation |
| Winkum Dam | Montana | Valley | 28 | Low | Satisfactory | — | |
| Jessup Mill Pond Dam | Montana | Flathead | 28 | High | Satisfactory | 1941 | Water Supply |
| Doukhobors | Montana | Judith Basin | 28 | Low | — | 1965 | Fire Protection, Stock, Or ... |
| Sportsman | Montana | Fallon | 28 | Significant | — | 1955 | Recreation |
| Brewer #3 | Montana | Custer | 28 | Low | — | 1950 | Fire Protection, Stock, Or ... |
| Waller | Montana | McCone | 28 | Low | — | 1950 | Fire Protection, Stock, Or ... |
| Sturgis | Montana | Richland | 28 | Low | — | 1970 | Flood Risk Reduction |
| Balder Reservoir | Montana | McCone | 28 | Significant | — | 1962 | Flood Risk Reduction |
| Deadmans Basin Water Supply Canal Storage Reservoir #6 | Montana | Wheatland | 28 | Low | — | — | Water Supply |
| Robinson #1 | Montana | Custer | 28 | Low | — | 1940 | Fire Protection, Stock, Or ... |
| Pishkun Dike 3 | Montana | Teton | 28 | High | Not Available | 1931 | Irrigation |
| Whitetail Dam | Montana | Jefferson | 28 | High | Not Rated | 1922 | Irrigation |
| Mccarter West Dam | Montana | Toole | 28 | Significant | — | 1953 | Irrigation |
| South Fork Detention Dam | Montana | Prairie | 28 | Low | Poor | 1964 | Fire Protection, Stock, Or ... |
| M Hardy #3 | Montana | Custer | 28 | Low | — | 1958 | 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.