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 |
|---|---|---|---|---|---|---|---|
| Pepper #1 | Montana | Park | 30 | Low | — | 1953 | Irrigation |
| Big Lake | Montana | Missoula | 30 | Significant | — | 1915 | Water Supply |
| Pepper #2 | Montana | Park | 30 | Low | — | 1954 | Irrigation |
| Lazy Jd #10 | Montana | Fergus | 30 | Low | — | 1958 | Fire Protection, Stock, Or ... |
| Storm Lake Dam | Montana | Deer Lodge | 29 | High | Poor | 1898 | Irrigation |
| Costich Dam | Montana | Lincoln | 29 | High | Satisfactory | 1956 | Irrigation |
| Watters #1 | Montana | Powder River | 29 | Significant | — | 1966 | Irrigation |
| Onion Head | Montana | Meagher | 29 | Low | — | 1955 | Irrigation |
| 20 Dam | Montana | Custer | 29 | Low | Poor | 2003 | |
| Killen Dam | Montana | Rosebud | 29 | Low | — | 1970 | Fire Protection, Stock, Or ... |
| Whitetail Detention Dam | Montana | Valley | 29 | Low | Poor | 1965 | Fire Protection, Stock, Or ... |
| Griffin | Montana | Custer | 29 | Low | — | 1972 | Fire Protection, Stock, Or ... |
| Porch #1 | Montana | Powder River | 29 | Low | — | 1961 | Fire Protection, Stock, Or ... |
| Get Down | Montana | Garfield | 29 | Low | — | 1952 | Irrigation |
| Pr-137 King Retention Dam | Montana | Phillips | 29 | Low | Not Rated | 1937 | Flood Risk Reduction |
| Christianson | Montana | McCone | 29 | Low | — | 1960 | Fire Protection, Stock, Or ... |
| Bison Bone Retention Dam | Montana | Phillips | 29 | Low | Not Rated | 1967 | Fire Protection, Stock, Or ... |
| Sob Detention Dam | Montana | Valley | 29 | Low | Poor | 1966 | Flood Risk Reduction |
| Lower | Montana | Prairie | 29 | Low | — | 1962 | Fire Protection, Stock, Or ... |
| Volf, C. | Montana | Wheatland | 29 | Low | — | 1971 | Irrigation |
| Ash Creek | Montana | Prairie | 29 | Low | — | 1951 | Irrigation |
| Shale Creek | Montana | Petroleum | 29 | Low | — | 1957 | Irrigation |
| Pr-54 Retention Dam | Montana | Phillips | 29 | Low | Not Rated | 1936 | Fire Protection, Stock, Or ... |
| Saint Marys Diversion Dam | Montana | Glacier | 29 | Low | Not Available | 1915 | Irrigation |
| Kona Ranch | Montana | Missoula | 29 | Significant | — | 1959 | Irrigation |
| Wilson (Judith Basin) | Montana | Judith Basin | 29 | High | Satisfactory | 1952 | Irrigation |
| Valley Dam | Montana | Valley | 29 | Low | Not Rated | — | |
| Pfaff Irrigation | Montana | Prairie | 28 | Significant | — | 1957 | Irrigation |
| Lacosta | Montana | Garfield | 28 | Low | — | 1968 | Irrigation |
| South Fork Detention Dam | Montana | Prairie | 28 | Low | Poor | 1964 | Fire Protection, Stock, Or ... |
| Deadmans Basin Water Supply Canal Storage Reservoir #6 | Montana | Wheatland | 28 | Low | — | — | Water Supply |
| Balder Reservoir | Montana | McCone | 28 | Significant | — | 1962 | Flood Risk Reduction |
| Whitetail Dam | Montana | Jefferson | 28 | High | Not Rated | 1922 | Irrigation |
| Jessup Mill Pond Dam | Montana | Flathead | 28 | High | Satisfactory | 1941 | Water Supply |
| Black Sea Reservoir | Montana | Rosebud | 28 | Low | — | 1950 | Fire Protection, Stock, Or ... |
| Sturgis | Montana | Richland | 28 | Low | — | 1970 | Flood Risk Reduction |
| Sister Sledge | Montana | Liberty | 28 | Low | — | 1960 | Fire Protection, Stock, Or ... |
| Beardsley #7 | Montana | Custer | 28 | Low | — | 1964 | Fire Protection, Stock, Or ... |
| Frog Dam | Montana | Richland | 28 | Low | — | 1973 | Fire Protection, Stock, Or ... |
| Rindal | Montana | Fergus | 28 | Low | Not Available | 1938 | Fire Protection, Stock, Or ... |
| Sportsman | Montana | Fallon | 28 | Significant | — | 1955 | Recreation |
| M Hardy #3 | Montana | Custer | 28 | Low | — | 1958 | Irrigation |
| Robinson #3 | Montana | Custer | 28 | Low | — | 1956 | Irrigation |
| Venn #1 | Montana | Custer | 28 | Significant | — | 1936 | Irrigation |
| Stellar Lake | Montana | Rosebud | 28 | Low | — | 1957 | Irrigation |
| Nelson Dike C | Montana | Phillips | 28 | High | Not Available | 1915 | Irrigation |
| Watts #1 | Montana | Custer | 28 | Low | — | 1912 | Irrigation |
| Clark Retention Dam | Montana | Prairie | 28 | Low | Not Rated | 2003 | Fire Protection, Stock, Or ... |
| Winkum Dam | Montana | Valley | 28 | Low | Satisfactory | — | |
| Pishkun Dike 3 | Montana | Teton | 28 | High | Not Available | 1931 | 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.