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 1751–1775 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Manual Oakley Group Dam Teton County | 20 | 1963 | Significant | Not Rated |
| Manuel #1 Petroleum County | 30 | 1949 | Low | Not Rated |
| Manuel #2 Petroleum County | 20 | 1969 | Low | Not Rated |
| Many People Blaine County | 12 | 1960 | Low | Not Rated |
| Maraschino Valley County | 14 | 1960 | Low | Not Rated |
| Margaret Hays #1 McCone County | 24 | 1965 | Low | Not Rated |
| Marias Hereford Ranch #30 Pondera County | 8 | 1960 | Low | Not Rated |
| Marine Dam Lake County | 15 | 1970 | Low | Not Rated |
| Marlew #2 Carbon County | 18 | 1960 | Low | Not Rated |
| Mars Hill County | 12 | 1958 | Low | Not Rated |
| Marsh Dam Sheridan County | 27 | 1967 | Low | Not Rated |
| Marsh Lake Madison County | 8 | 1956 | Low | Not Available |
| Marstaeller Irrigation Dam Sweet Grass County | 39 | 1984 | Low | Not Rated |
| Martawn Veseth #3 Phillips County | 15 | 1955 | Low | Not Rated |
| Martin #1 McCone County | 25 | 1959 | Low | Not Rated |
| Martin #1 (Phillips) Phillips County | 25 | 1953 | Low | Not Rated |
| Martinsdale, East Dam Wheatland County | 49 | 1939 | High | Poor |
| Martinsdale, North Dam Wheatland County | 91 | 1939 | High | Satisfactory |
| Marys Lamb Carter County | 14 | 1945 | Low | Not Rated |
| Mason Garfield County | 10 | 1937 | Low | Not Rated |
| Matador Ranch #10 Phillips County | 12 | 1968 | Low | Not Rated |
| Matador Ranch #4 Phillips County | 12 | 1965 | Low | Not Rated |
| Matador Ranch #6 Phillips County | 12 | 1965 | Low | Not Rated |
| Matador Ranch #8 Phillips County | 25 | 1968 | Low | Not Rated |
| Mather #2 Custer County | 18 | 1940 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.