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 |
|---|---|---|---|---|---|---|---|
| Sagebrush #2 | Montana | Phillips | 30 | Low | - | 1967 | Fire Protection, Stock, Or ... |
| Oset #1 | Montana | Musselshell | 30 | Low | - | 1945 | Fire Protection, Stock, Or ... |
| Big Lake | Montana | Missoula | 30 | Significant | - | 1915 | Water Supply |
| Mcmullin Bros Upper | Montana | Prairie | 30 | Low | - | 1960 | Irrigation |
| 20 Dam | Montana | Custer | 29 | Low | Poor | 2003 | |
| Ash Creek | Montana | Prairie | 29 | Low | - | 1951 | Irrigation |
| Shale Creek | Montana | Petroleum | 29 | Low | - | 1957 | Irrigation |
| Bison Bone Retention Dam | Montana | Phillips | 29 | Low | Not Rated | 1967 | Fire Protection, Stock, Or ... |
| Kona Ranch | Montana | Missoula | 29 | Significant | - | 1959 | Irrigation |
| Lower | Montana | Prairie | 29 | Low | - | 1962 | Fire Protection, Stock, Or ... |
| Volf, C. | Montana | Wheatland | 29 | Low | - | 1971 | Irrigation |
| Whitetail Detention Dam | Montana | Valley | 29 | Low | Poor | 1965 | Fire Protection, Stock, Or ... |
| Valley Dam | Montana | Valley | 29 | Low | Not Rated | - | |
| Saint Marys Diversion Dam | Montana | Glacier | 29 | Low | Not Available | 1915 | Irrigation |
| Onion Head | Montana | Meagher | 29 | Low | - | 1955 | 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 |
| Sob Detention Dam | Montana | Valley | 29 | Low | Poor | 1966 | Flood Risk Reduction |
| Christianson | Montana | McCone | 29 | Low | - | 1960 | Fire Protection, Stock, Or ... |
| Costich Dam | Montana | Lincoln | 29 | High | Satisfactory | 1956 | Irrigation |
| Get Down | Montana | Garfield | 29 | Low | - | 1952 | Irrigation |
| Watters #1 | Montana | Powder River | 29 | Significant | - | 1966 | Irrigation |
| Killen Dam | Montana | Rosebud | 29 | Low | - | 1970 | Fire Protection, Stock, Or ... |
| Pr-54 Retention Dam | Montana | Phillips | 29 | Low | Not Rated | 1936 | Fire Protection, Stock, Or ... |
| Porch #1 | Montana | Powder River | 29 | Low | - | 1961 | Fire Protection, Stock, Or ... |
| Wilson (Judith Basin) | Montana | Judith Basin | 29 | High | Satisfactory | 1952 | Irrigation |
| Griffin | Montana | Custer | 29 | Low | - | 1972 | Fire Protection, Stock, Or ... |
| Lacosta | Montana | Garfield | 28 | Low | - | 1968 | Irrigation |
| Robinson #3 | Montana | Custer | 28 | Low | - | 1956 | Irrigation |
| Pishkun Dike 3 | Montana | Teton | 28 | High | Not Available | 1931 | Irrigation |
| Anderson Reservoir | Montana | Blaine | 28 | Low | - | 1939 | Fire Protection, Stock, Or ... |
| Balder Reservoir | Montana | McCone | 28 | Significant | - | 1962 | Flood Risk Reduction |
| Nelson Dike C | Montana | Phillips | 28 | High | Not Available | 1915 | Irrigation |
| Indian #4 | Montana | Fergus | 28 | Low | - | 1961 | Fire Protection, Stock, Or ... |
| Brewer #3 | Montana | Custer | 28 | Low | - | 1950 | 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 ... |
| Pfaff Irrigation | Montana | Prairie | 28 | Significant | - | 1957 | Irrigation |
| Beardsley #7 | Montana | Custer | 28 | Low | - | 1964 | Fire Protection, Stock, Or ... |
| Deadmans Basin Water Supply Canal Storage Reservoir #6 | Montana | Wheatland | 28 | Low | - | - | Water Supply |
| Venn #1 | Montana | Custer | 28 | Significant | - | 1936 | Irrigation |
| Sturgis | Montana | Richland | 28 | Low | - | 1970 | Flood Risk Reduction |
| Whitetail Dam | Montana | Jefferson | 28 | High | Not Rated | 1922 | Irrigation |
| Watts #1 | Montana | Custer | 28 | Low | - | 1912 | Irrigation |
| Frog Dam | Montana | Richland | 28 | Low | - | 1973 | Fire Protection, Stock, Or ... |
| Robinson #1 | Montana | Custer | 28 | Low | - | 1940 | Fire Protection, Stock, Or ... |
| Mccarter West Dam | Montana | Toole | 28 | Significant | - | 1953 | Irrigation |
| Sportsman | Montana | Fallon | 28 | Significant | - | 1955 | Recreation |
| Jessup Mill Pond Dam | Montana | Flathead | 28 | High | Satisfactory | 1941 | Water Supply |
| Winkum Dam | Montana | Valley | 28 | Low | Satisfactory | - |
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.