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 1726–1750 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Lyle Nelson #5 McCone County | 15 | 1949 | Low | Not Rated |
| Lyle Nelson #6 McCone County | 14 | 1945 | Low | Not Rated |
| Lyle Nelson #7 McCone County | 14 | 1954 | Low | Not Rated |
| Lyle Nelson #8 McCone County | 20 | 1969 | Low | Not Rated |
| Mable #2 Phillips County | 12 | 1960 | Low | Not Rated |
| Macdonald Pond Dam Beaverhead County | 9 | 1953 | Low | Poor |
| Macdonalds Farm Reservoir Chouteau County | 14 | 1930 | Low | Not Rated |
| Mad Chant Madison County | 20 | 1950 | Low | Not Rated |
| Mad Dam Judith Basin County | 26 | 1955 | Low | Not Rated |
| Maddox Ranch Corporation #1 Blaine County | 7 | 1960 | Low | Not Rated |
| Madison Dam Madison County | 39 | 1907 | High | Satisfactory |
| Magnesia Garfield County | 12 | 1960 | Low | Not Rated |
| Magnum East Hill County | 15 | 1950 | Low | Not Rated |
| Magnum South Hill County | 15 | 1950 | Low | Not Rated |
| Mahan and Hoyt Reservoir Valley County | 8 | 1915 | Low | Not Rated |
| Major #1 Carter County | 18 | 1954 | Low | Not Rated |
| Malkuch Dawson County | 15 | 1953 | Significant | Not Rated |
| Manchester Cascade County | 8 | — | Significant | Not Rated |
| Manchurians Chouteau County | 15 | 1960 | Low | Not Rated |
| Maney Jefferson County | 21 | 1979 | Low | Not Rated |
| Manger Meagher County | 20 | 1937 | Low | Not Rated |
| Manley #1 Powell County | 10 | 1964 | Low | Not Rated |
| Manley #2 Powell County | 25 | 1964 | Significant | Not Rated |
| Manley #3 Powell County | 15 | 1974 | Low | Not Rated |
| Mannix Powell County | 30 | 1962 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.