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 1851–1875 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Miles City Sewage Disposal Pond #3 Custer County | 9 | 1954 | Low | Not Rated |
| Milford Colony Lewis and Clark County | 15 | 1963 | Low | Not Rated |
| Miller Sheridan County | 27 | 1974 | Low | Not Rated |
| Miller (Blaine) Blaine County | 16 | 1939 | Significant | Not Rated |
| Miller Bros Hill County | 30 | 1970 | Low | Not Rated |
| Miller Brothers Livestock Reservoir Judith Basin County | 20 | 1975 | Low | Not Rated |
| Miller Dam Lincoln County | 9 | 1980 | Significant | Not Rated |
| Miller Lake (Powell) Powell County | 25 | 1962 | Low | Not Rated |
| Miller Reservoir (Blaine) Blaine County | 30 | 1954 | Low | Not Rated |
| Mill Lake Ravalli County | 25 | 1895 | High | Not Rated |
| Mincoff #2 Garfield County | 20 | 1950 | Significant | Not Rated |
| Mincoff Reservoir #1 Garfield County | 22 | 1937 | Low | Not Rated |
| Miner Farms #1 Daniels County | 25 | 1940 | Low | Not Rated |
| Minutemen Prairie County | 30 | 1952 | Low | Not Rated |
| Misplaced Dam Garfield County | 27 | 1963 | Low | Not Rated |
| Miss Doll Dial Dam Blaine County | 15 | — | Low | Not Rated |
| Miss Easy Pride Toole County | 8 | 1960 | Low | Not Rated |
| Miss Flaming Jet Blaine County | 25 | 1938 | Low | Not Rated |
| Mission Lake County | 98 | 1935 | High | Fair |
| Mission Mountain Hill County | 20 | 1950 | Low | Not Rated |
| Missouri Bird Cascade County | 15 | 1930 | Low | Not Rated |
| Missouri Wolf Judith Basin County | 16 | 1950 | Low | Not Rated |
| Mistress Leader Hill County | 25 | 1956 | Low | Not Rated |
| Mitchell Blaine County | 25 | 1938 | Low | Not Rated |
| Mitchell One Phillips County | 15 | 1960 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.