Montana Dams
2,990 dams tracked by the National Inventory of Dams
Total Dams
2,990
High Hazard
188
6.3%
Poor / Unsatisfactory
132
Average Age
74 yrs
Hazard Classification
High188 (6.3%)
Significant193 (6.5%)
Low2,606 (87.2%)
Condition Assessment
Satisfactory113 (3.8%)
Fair44 (1.5%)
Poor / Unsatisfactory132 (4.4%)
Not Rated2,701 (90.3%)
Federal
278
State
151
Local
84
Private
2,466
Tallest Dams
- Yankee Doodle Tailings Dam570 ft
- Hungry Horse Dam564 ft
- Libby Dam422 ft
- Noxon Rapids260 ft
- Fort Peck Dam256 ft
High Hazard Dams
- Yankee Doodle Tailings DamHigh
- Hungry Horse DamHigh
- Libby DamHigh
- Noxon RapidsHigh
- Fort Peck DamHigh
Poor Condition Dams
All Dams in Montana
Showing 1001–1025 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| M Gaskill #1 Powder River County | 10 | 1965 | Low | Not Rated |
| Meyer'S Dam Deer Lodge County | 25 | 1902 | Low | Not Rated |
| Mesaros Cascade County | 30 | 1958 | Low | Not Rated |
| Merrell Dam Park County | 15 | 1966 | Low | Not Rated |
| Merlin Garfield County | 30 | 1954 | Low | Not Rated |
| Mercury (Hill) Hill County | 12 | 1941 | Low | Not Rated |
| Mera Beaverhead County | 20 | 1945 | Low | Not Rated |
| Menkar Liberty County | 30 | 1966 | Low | Not Rated |
| Melcott Toole County | 10 | 1904 | Low | Not Rated |
| Meissner Liberty County | 10 | 1963 | Low | Not Rated |
| Meeting Place Phillips County | 8 | 1960 | Low | Not Rated |
| Mees #1 Rosebud County | 18 | 1949 | Low | Not Rated |
| Medicine Lake Dam No. 4 Sheridan County | 15 | 1935 | Low | Poor |
| Medicine Lake Dam No. 12 Sheridan County | 10 | 1935 | Low | Poor |
| Medicine Lake Dam No. 11 Sheridan County | 9 | 1935 | Low | Poor |
| Medicine Lake Dam No. 10 Sheridan County | 8 | 1935 | Low | Poor |
| Meccage #3 Fallon County | 20 | 1955 | Low | Not Rated |
| Meadow Blaine County | 20 | 1967 | Low | Not Rated |
| Mcwilliams Reservoir Garfield County | 34 | 1965 | Low | Not Rated |
| Mcslay,John Estate Hill County | 20 | 1947 | Low | Not Rated |
| Mc Rae #1 Rosebud County | 24 | 1955 | Low | Not Rated |
| Mcnab Dam Valley County | 39 | 2003 | Low | Unsatisfactory |
| Mcmullin Bros Upper Prairie County | 30 | 1960 | Low | Not Rated |
| Mcmullin Bros Detention Prairie County | 30 | 1966 | Low | Not Rated |
| Mcmullin Bros Cooperative Prairie County | 30 | 1964 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.