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 176–188 of 188
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Bigfork Diversion Dam Flathead County | 22 | 1910 | High | Poor |
| Big Casino Creek Dam Fergus County | 80 | 1976 | High | Satisfactory |
| Bell Lake Dam Madison County | 20 | 1957 | High | Not Available |
| Beaver Ranch Dam Madison County | 15 | 1945 | High | Satisfactory |
| Beaver Creek Reservoir Dam Hill County | 108 | 1974 | High | Fair |
| Bearpaw Lake Dam Hill County | 64 | 1958 | High | Satisfactory |
| Bass Lake Ravalli County | 35 | 1887 | High | Not Rated |
| Basin Creek Dam #1 Silver Bow County | 101 | 1897 | High | Satisfactory |
| Bair Meagher County | 106 | 1939 | High | Satisfactory |
| Anita Dam Blaine County | 42 | 1995 | High | Fair |
| Anchor South Dam Beaverhead County | 11 | 1904 | High | Satisfactory |
| Agnes Lake Beaverhead County | 13 | 1928 | High | Not Rated |
| Ackley Lake Dam Judith Basin County | 55 | 1938 | High | Satisfactory |
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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.