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 1801–1825 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Mckay Creek Powell County | 33 | 1955 | High | Fair |
| Mckeever, Frank #2 Garfield County | 25 | 1956 | Significant | Not Rated |
| Mckeever Reservoir Garfield County | 18 | 1967 | Low | Not Rated |
| Mckerlic #1 Garfield County | 15 | 1920 | Low | Not Rated |
| Mckinley Lake Missoula County | 7 | 1923 | Significant | Not Rated |
| Mckinnsey Reservoir Hill County | 16 | 1914 | Low | Not Rated |
| Mcknight #1 Carter County | 25 | 1951 | Low | Not Rated |
| Mcknight #2 Carter County | 25 | 1953 | Low | Not Rated |
| McLaren Dam Blaine County | 24 | 1890 | Low | Poor |
| Mc Lean #1 Custer County | 12 | 1957 | Low | Not Rated |
| Mclean and Sons INCorporated #1 Pondera County | 22 | 1948 | Low | Not Rated |
| Mclean Dam (Hill) Hill County | 25 | 1899 | Low | Not Rated |
| Mclean (Toole) Toole County | 27 | 1950 | Low | Not Rated |
| Mcmullin Bros Cooperative Prairie County | 30 | 1964 | Low | Not Rated |
| Mcmullin Bros Detention Prairie County | 30 | 1966 | Low | Not Rated |
| Mcmullin Bros Upper Prairie County | 30 | 1960 | Low | Not Rated |
| Mcnab Dam Valley County | 39 | 2003 | Low | Unsatisfactory |
| Mc Rae #1 Rosebud County | 24 | 1955 | Low | Not Rated |
| Mcslay,John Estate Hill County | 20 | 1947 | Low | Not Rated |
| Mcwilliams Reservoir Garfield County | 34 | 1965 | Low | Not Rated |
| Meadow Blaine County | 20 | 1967 | Low | Not Rated |
| Meccage #3 Fallon County | 20 | 1955 | Low | Not Rated |
| Medicine Lake Dam No. 10 Sheridan County | 8 | 1935 | Low | Poor |
| Medicine Lake Dam No. 11 Sheridan County | 9 | 1935 | Low | Poor |
| Medicine Lake Dam No. 12 Sheridan County | 10 | 1935 | Low | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.