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 1–25 of 79
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| 20 Dam Custer County | 29 | 2003 | Low | Poor |
| Bar Island Detention Dam Phillips County | 44 | 1967 | Low | Poor |
| Basin Creek Dam #2 Silver Bow County | 49 | 1907 | Significant | Poor |
| Beardsley Retention Dam Custer County | 31 | 2003 | Low | Poor |
| Beaver Pond Dam Sheridan County | 11 | 1958 | Low | Poor |
| Bigfork Diversion Dam Flathead County | 22 | 1910 | High | Poor |
| Black Coulee Dam Blaine County | 11 | 1938 | Low | Poor |
| Black Eagle Cascade County | 41 | 1891 | High | Poor |
| Boot Lake Dam Beaverhead County | 27 | 1912 | High | Poor |
| Coal Creek Detention Dam Prairie County | 31 | 1963 | Low | Poor |
| Cooney Carbon County | 102 | 1937 | High | Poor |
| Cottonwood Dam (Park) Park County | 39 | 1953 | High | Poor |
| Crow Lake County | 99 | 1933 | High | Poor |
| Current Detention Dam Phillips County | 34 | 1969 | Low | Poor |
| Delmoe Lake Dam Jefferson County | 60 | 1914 | High | Poor |
| Depression Detention Dam Carbon County | 42 | 1968 | High | Poor |
| Ernest Wallstein Dam Carter County | 36 | — | Low | Poor |
| Eureka Reservoir Dam Teton County | 32 | 1936 | High | Poor |
| Finale Detention Dam Valley County | 34 | 1965 | Low | Poor |
| Forrest Detention Dam Valley County | 20 | 1957 | Low | Poor |
| Foulweather Detention Dam Valley County | 30 | 1966 | Low | Poor |
| Glen Lake Lincoln County | 14 | 1950 | High | Poor |
| Halfpint Detention Dam Valley County | 32 | 1965 | Low | Poor |
| Hard Rock Detention Dam Valley County | 24 | 1965 | Low | Poor |
| Hewitt Dam Phillips County | 10 | 1938 | Low | Poor |
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Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.