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 1701–1725 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Murphy #2 McCone County | 12 | 1969 | Low | Not Rated |
| Murphy and Sons #2 McCone County | 10 | 1940 | Low | Not Rated |
| Murphy + Sons #1 McCone County | 20 | 1960 | Low | Not Rated |
| Murray Fergus County | 30 | 1940 | Low | Not Rated |
| Murray #1 Custer County | 20 | 1960 | Low | Not Rated |
| Mustapha Hill County | 8 | 1960 | Low | Not Rated |
| Myron #2 Dawson County | 15 | 1948 | Low | Not Rated |
| Narcissus Hill County | 20 | 1950 | Low | Not Rated |
| N Barnett #1 Petroleum County | 15 | 1964 | Low | Not Rated |
| N Barrett #2 Petroleum County | 20 | 1938 | Low | Not Rated |
| Needle Butte Reservoir Rosebud County | 30 | 1953 | Low | Not Rated |
| Nefsy #1 Custer County | 19 | 1965 | Low | Not Rated |
| Nefsy #2 Prairie County | 10 | 1950 | Low | Not Rated |
| Nefsy #2 (Custer) Custer County | 21 | 1966 | Low | Not Rated |
| Nefsy #3 Prairie County | 15 | 1953 | Low | Not Rated |
| Nefsy #4 (Custer) Custer County | 22 | 1952 | Low | Not Rated |
| Neikro Chouteau County | 15 | 1975 | Low | Not Rated |
| Neiser #1 Sheridan County | 35 | 1936 | Low | Not Rated |
| Nelson #2 McCone County | 15 | 1960 | Low | Not Rated |
| Nelson Irrigation (Wheatland) Wheatland County | 25 | 1956 | Low | Not Rated |
| Nelson (Phillips) Phillips County | 27 | 1920 | Low | Not Rated |
| Nelson Reservoir #2 McCone County | 15 | 1952 | Low | Not Rated |
| Nelsons Valley County | 15 | 1947 | Low | Not Rated |
| N E Olsen #1 Garfield County | 24 | 1938 | Low | Not Rated |
| Neptune Teton County | 16 | 1920 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.