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 2851–2875 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Barrett, J. Dam Beaverhead County | 35 | 1962 | Low | Not Rated |
| Barney Rubbel Roosevelt County | 15 | 1960 | Low | Not Rated |
| Barnard (Valley) Valley County | 15 | 1953 | Low | Not Rated |
| Barnard Dam Phillips County | 24 | — | Low | Satisfactory |
| Barley Reservoir Rosebud County | 24 | 1958 | Significant | Not Rated |
| Bar Island Detention Dam Phillips County | 44 | 1967 | Low | Poor |
| Bar G9 #2 Rosebud County | 17 | 1950 | Low | Not Rated |
| Barclay Garfield County | 24 | 1955 | Low | Not Rated |
| Baracker Roosevelt County | 30 | 1935 | Low | Not Rated |
| Bar 69 #6 Rosebud County | 25 | 1955 | Low | Not Rated |
| Bar 69 #5 Rosebud County | 30 | 1955 | Low | Not Rated |
| Bar 69 #4 Rosebud County | 30 | 1955 | Low | Not Rated |
| Bank Dam Richland County | 14 | 1972 | Low | Not Rated |
| Banka Dama Pondera County | 20 | 1930 | Low | Not Rated |
| Bandy Reservoir Powell County | 15 | 1937 | Low | Not Rated |
| B and B Fish Pond Jefferson County | 8 | 1947 | Low | Not Rated |
| Band Aid Roosevelt County | 12 | 1913 | Low | Not Rated |
| Banana Peel Park County | 8 | 1952 | Low | Not Available |
| Balsam #6 Custer County | 19 | 1956 | Low | Not Rated |
| Balsam #4 Custer County | 20 | 1960 | Low | Not Rated |
| Balsam #3 Custer County | 30 | 1945 | Low | Not Rated |
| Balsam #1 Custer County | 32 | 1967 | Low | Not Rated |
| Ballard #1 Rosebud County | 12 | 1941 | Low | Not Rated |
| Balder Reservoir McCone County | 28 | 1962 | Significant | Not Rated |
| Bair Meagher County | 106 | 1939 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.