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 2551–2575 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Anita Dam Yellowstone County | 42 | 1937 | Low | Not Available |
| A Nichols Valley County | 10 | 1967 | Low | Not Rated |
| Angus #4 Garfield County | 15 | 1950 | Low | Not Rated |
| Andy Capp Roosevelt County | 12 | 1949 | Low | Not Rated |
| Anderson Reservoir #1 (Roosevelt) Roosevelt County | 20 | 1959 | Low | Not Rated |
| Anderson Reservoir Blaine County | 28 | 1939 | Low | Not Rated |
| Anderson Lake Lewis and Clark County | 15 | 1956 | Low | Not Rated |
| A Muri #2 Powder River County | 24 | 1924 | Low | Not Rated |
| A M Prevost Richland County | 22 | 1968 | Low | Not Rated |
| American Prairie Reserve Pond 6 Phillips County | 14 | — | Low | Not Rated |
| American Prairie Reserve Pond 3 Phillips County | 12 | — | Low | Not Rated |
| Aluminum Wibaux County | 18 | 1963 | Low | Not Rated |
| Allison Toole County | 12 | 1964 | Low | Not Rated |
| Alley Oop Phillips County | 20 | 1957 | Low | Not Rated |
| Allen #6 Powder River County | 23 | 1960 | Low | Not Rated |
| Allen #5 Custer County | 21 | 1964 | Low | Not Rated |
| Allan #2 Custer County | 24 | 1955 | Low | Not Rated |
| Allan Richland County | 10 | 1950 | Low | Not Rated |
| Alkali (Toole) Toole County | 20 | 1907 | Low | Not Rated |
| Alkali Flat Toole County | 25 | 1965 | Low | Not Rated |
| Alkali Detention Dam Valley County | 14 | 1958 | Low | Unsatisfactory |
| Alfred Jordan #1 Garfield County | 25 | 1950 | Low | Not Rated |
| Alexander Garfield County | 22 | 1938 | Low | Not Rated |
| Alderman #2 Powder River County | 30 | 1945 | Low | Not Rated |
| Alderman #1 Powder River County | 20 | 1970 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.