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 2951–2975 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Alkali Detention Dam Valley County | 14 | 1958 | Low | Unsatisfactory |
| Algol Toole County | 20 | 1959 | Significant | Not Rated |
| 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 |
| Aldebaran Pondera County | 35 | 1920 | Significant | Not Rated |
| Albro Madison County | 11 | 1967 | Low | Not Available |
| Albert #2 Fergus County | 19 | 1936 | Low | Not Rated |
| Albert #1 Fergus County | 19 | 1940 | Low | Not Rated |
| Alay #2 Garfield County | 15 | 1950 | Low | Not Rated |
| Alay #1 Garfield County | 15 | 1950 | Low | Not Rated |
| A J Tillman #2 Blaine County | 18 | 1930 | Low | Not Rated |
| Airpump Wheatland County | 20 | 1965 | Low | Not Rated |
| A Irion #1 Powder River County | 12 | 1953 | Low | Not Rated |
| Agnes Lake Beaverhead County | 13 | 1928 | High | Not Rated |
| Agnes Bob and Noel Chouteau County | 30 | 1957 | Low | Not Rated |
| Agate Flat Dam Prairie County | 32 | — | Low | Satisfactory |
| Adidias Garfield County | 15 | 1960 | Low | Not Rated |
| Adams, L. (Fergus) Fergus County | 20 | 1957 | Low | Not Rated |
| Adams #5 Rosebud County | 17 | 1936 | Low | Not Rated |
| Adams #4 Rosebud County | 17 | 1935 | Low | Not Rated |
| Adams #3 Rosebud County | 17 | 1952 | Low | Not Rated |
| Adams #2 Fergus County | 16 | 1960 | Low | Not Rated |
| A C Lincoln Hill County | 31 | 1930 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.