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 2826–2850 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Beaver Creek Reservoir Dam Hill County | 108 | 1974 | High | Fair |
| Beaver Blaine County | 15 | 1957 | Low | Not Rated |
| Bearpaw Lake Dam Hill County | 64 | 1958 | High | Satisfactory |
| Beardsley Retention Dam Custer County | 31 | 2003 | Low | Poor |
| Beardsley #7 Custer County | 28 | 1964 | Low | Not Rated |
| Beardsley #6 Custer County | 20 | 1962 | Low | Not Rated |
| Bear Creek Reservoir Center Dam Fergus County | 11 | 1950 | Low | Not Rated |
| B-Downs #8 Big Horn County | 20 | 1974 | Low | Not Rated |
| B B Naylor Big Horn County | 15 | 1933 | Low | Not Rated |
| Bayer #1 Granite County | 10 | 1900 | Low | Not Rated |
| Battle Horse Reservoir Blaine County | 15 | 1920 | Low | Not Rated |
| Battle Creek Meagher County | 34 | 1956 | Low | Not Rated |
| Batters Box Liberty County | 25 | 1930 | Low | Not Rated |
| Bateman #1 Garfield County | 20 | 1973 | Low | Not Rated |
| Bass (Rosebud) Rosebud County | 30 | 1963 | Low | Not Rated |
| Bass Lake Ravalli County | 35 | 1887 | High | Not Rated |
| Bassett Treasure County | 10 | 1959 | Low | Not Rated |
| Basin Creek Dam #2 Silver Bow County | 49 | 1907 | Significant | Poor |
| Basin Creek Dam #1 Silver Bow County | 101 | 1897 | High | Satisfactory |
| Bar Z F Ranch INCorporated #1 Toole County | 12 | 1940 | Low | Not Rated |
| Bar V Ranch Big Horn County | 25 | 1960 | Low | Not Rated |
| Bar V #1 Big Horn County | 30 | 1955 | Low | Not Rated |
| Barta, A.J. #2 Custer County | 34 | 1972 | Low | Not Rated |
| Barta, A.J. #1 Custer County | 20 | 1972 | Low | Not Rated |
| Barretts Diversion Dam Beaverhead County | 11 | 1963 | Low | Not Available |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.