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 76–100 of 113
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| East Boulder Tailings Dam Sweet Grass County | — | — | High | Satisfactory |
| Duck Creek Retention Dam Petroleum County | 16 | 2003 | High | Satisfactory |
| Deadmans Basin Dike Wheatland County | 23 | 1941 | High | Satisfactory |
| Deadmans Basin Dam Wheatland County | 60 | 1941 | High | Satisfactory |
| Dead Horse Detention Dam Valley County | 16 | 1960 | Low | Satisfactory |
| Crisafulli Lake Dawson County | 22 | 1959 | High | Satisfactory |
| Crazy Mountain Ranch Park County | 36 | 1968 | High | Satisfactory |
| Cowpath Dam Toole County | 65 | 1967 | High | Satisfactory |
| Costich Dam Lincoln County | 29 | 1956 | High | Satisfactory |
| Colstrip Evaporation Pond Dam Rosebud County | 88 | 1976 | High | Satisfactory |
| Colstrip Diversion Dam Rosebud County | 44 | 1976 | High | Satisfactory |
| Coal Creek Drop Dam Prairie County | 31 | — | Low | Satisfactory |
| Clover Drop Dam Valley County | 15 | — | Low | Satisfactory |
| Chessman Saddle Dam Jefferson County | 27 | 1908 | High | Satisfactory |
| Cedar Creek Flathead County | 93 | 1971 | High | Satisfactory |
| Castle Rock Saddle Dam Rosebud County | 20 | 1976 | High | Satisfactory |
| Castle Rock Reservoir Dam Rosebud County | 67 | 1976 | High | Satisfactory |
| Carbone Flood Control Dam Big Horn County | 32 | 2002 | High | Satisfactory |
| Canyon Lake Ravalli County | 21 | 1891 | High | Satisfactory |
| Bynum Reservoir Dam Teton County | 60 | 1926 | High | Satisfactory |
| Bullhook Lower Diversion Hill County | 77 | 1955 | High | Satisfactory |
| Bullhook Dam Hill County | 87 | 1955 | High | Satisfactory |
| Broadwater Dam Broadwater County | 50 | 1940 | High | Satisfactory |
| Br-12 Retention Dam Blaine County | 23 | 1936 | High | Satisfactory |
| Box Elder Creek Dam Sheridan County | 80 | 1963 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.