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 101–113 of 113
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Bonneau Chouteau County | 103 | 1940 | High | Satisfactory |
| Blixit Creek Missoula County | 30 | 1961 | High | Satisfactory |
| Big Sky Dam Madison County | 52 | 1973 | High | Satisfactory |
| Big Casino Creek Dam Fergus County | 80 | 1976 | High | Satisfactory |
| Beaver Ranch Dam Madison County | 15 | 1945 | High | Satisfactory |
| Bearpaw Lake Dam Hill County | 64 | 1958 | High | Satisfactory |
| Basin Creek Dam #1 Silver Bow County | 101 | 1897 | High | Satisfactory |
| Barnard Dam Phillips County | 24 | — | Low | Satisfactory |
| Bair Meagher County | 106 | 1939 | High | Satisfactory |
| Apache Dam Carter County | 22 | — | Low | Satisfactory |
| Anchor South Dam Beaverhead County | 11 | 1904 | High | Satisfactory |
| Agate Flat Dam Prairie County | 32 | — | Low | Satisfactory |
| 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.