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 1926–1950 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Mr Pp Garfield County | 15 | 1960 | Low | Not Rated |
| Mr Wipple Hill County | 15 | 1974 | Low | Not Rated |
| Mt Tunnels Tailings Dam Jefferson County | — | — | High | Satisfactory |
| Muddy Phillips County | 15 | 1950 | Low | Not Rated |
| Muddy Spots Cascade County | 20 | 1938 | Low | Not Rated |
| Mud Lake Powell County | 25 | 1950 | High | Fair |
| Mud Lake #1 Beaverhead County | 10 | 1945 | Low | Not Rated |
| Mud Lake #2 Beaverhead County | 10 | 1945 | Low | Not Rated |
| Multiplier Toole County | 13 | 1933 | Low | Not Rated |
| Muppet Fergus County | 10 | 1965 | Low | Not Rated |
| Muri #4 Custer County | 20 | 1960 | Low | Not Rated |
| Murion, B. #3 Garfield County | 15 | 1968 | Low | Not Rated |
| Murion, B. #5 Garfield County | 18 | 1950 | Low | Not Rated |
| Murion,Jim J. #1 Garfield County | 18 | 1950 | Low | Not Rated |
| Murion,Jim J. #2 Garfield County | 17 | 1950 | Low | Not Rated |
| Murky Retention Dam Phillips County | 28 | 1966 | Low | Not Rated |
| Murnion Dam Garfield County | 23 | — | Low | Not Rated |
| Murnions (Jim) Garfield County | 20 | 1938 | Significant | Not Rated |
| Murphy #1 McCone County | 15 | 1965 | Low | Not Rated |
| 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 |
| Mussigbrod Lake Dam Beaverhead County | 15 | 1969 | Significant | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.