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 2326–2350 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Bob #2 Garfield County | 20 | 1959 | Low | Not Rated |
| Bob #1 Garfield County | 20 | 1968 | Low | Not Rated |
| Bn #9 Treasure County | 13 | 1950 | Low | Not Rated |
| Bn #3 Rosebud County | 33 | 1966 | Low | Not Rated |
| Bn #11 Garfield County | 14 | 1954 | Low | Not Rated |
| Blyton Wibaux County | 18 | 1936 | Low | Not Rated |
| Blunt Ranches #4 Phillips County | 31 | 1946 | Low | Not Rated |
| Blunt Ranches #2 Phillips County | 8 | 1960 | Low | Not Rated |
| Blunt Ranch #3 Phillips County | 15 | 1960 | Low | Not Rated |
| Blue Shoes Garfield County | 9 | 1955 | Low | Not Rated |
| Blue Drew #1 Garfield County | 20 | 1966 | Low | Not Rated |
| Blue Cheese Valley County | 12 | 1950 | Low | Not Rated |
| Blue Baron Chouteau County | 30 | 1950 | Low | Not Rated |
| Blooming Creek Dam Cascade County | 8 | 1960 | Low | Not Rated |
| Blomquist Reservoir Beaverhead County | 12 | 1950 | Low | Not Rated |
| Blodgett Lake Ravalli County | 14 | 1911 | Low | Not Rated |
| Blatter Valley County | 25 | 1945 | Low | Not Rated |
| Blanchard Pond Beaverhead County | 10 | 1960 | Low | Not Rated |
| Blanchard Detention Dam X Valley County | 24 | 1960 | Low | Unsatisfactory |
| Blair #1 Liberty County | 14 | 1961 | Low | Not Rated |
| Black Wolff #3 Carter County | 25 | 1964 | Low | Not Rated |
| Black Wolff #2 Carter County | 12 | 1979 | Low | Not Rated |
| Blacks Pond Dam Rosebud County | 26 | 1960 | Low | Not Rated |
| Black Sea Reservoir Rosebud County | 28 | 1950 | Low | Not Rated |
| Black Out (Pondera) Pondera County | 18 | 1928 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.