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 1901–1925 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Montana #4 Rosebud County | 20 | 1955 | Low | Not Rated |
| Montana #6 Rosebud County | 20 | 1939 | Low | Not Rated |
| Montana #7 Rosebud County | 15 | 1953 | Low | Not Rated |
| Montana #9 Rosebud County | 18 | 1958 | Low | Not Rated |
| Montgomery #1 Rosebud County | 14 | 1950 | Low | Not Rated |
| Moore #1 Blaine County | 20 | 1960 | Low | Not Rated |
| Moore #2 Custer County | 31 | 1943 | Low | Not Rated |
| Moore #7 Custer County | 24 | 1959 | Low | Not Rated |
| Moos #1 McCone County | 15 | 1943 | Low | Not Rated |
| Morgan #1 Valley County | 10 | 1967 | Low | Not Rated |
| Morony Cascade County | 107 | 1929 | High | Satisfactory |
| Morris #1 (Toole) Toole County | 37 | 1948 | Low | Not Rated |
| Morris #2 (Toole) Toole County | 20 | 1960 | Low | Not Rated |
| Morrison Phillips County | 20 | 1940 | Low | Not Rated |
| Morton #1 Rosebud County | 20 | 1978 | Low | Not Rated |
| Mothershead, R. McCone County | 25 | 1960 | Low | Not Rated |
| Moulton Creek Dam #1 Silver Bow County | 67 | 1907 | High | Satisfactory |
| Moulton Reservoir #2 Silver Bow County | 25 | 1950 | Low | Not Rated |
| Mountain Ben Powell County | 9 | 1920 | Low | Not Available |
| Moving'Along Teton County | 38 | 1948 | Low | Not Rated |
| Mowbray #3 Carter County | 20 | 1950 | Low | Not Rated |
| Mrcla #5 Valley County | 12 | 1935 | Low | Not Rated |
| Mr Flaming Jet Blaine County | 15 | 1938 | Low | Not Rated |
| Mrlca #1 Phillips County | 15 | 1930 | Low | Not Rated |
| Mr Mito Bars Hill County | 30 | 1960 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.