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 2001–2025 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Froze-To-Death Land CO #1 Treasure County | 14 | 1958 | Low | Not Rated |
| Froze-To-Death #7 Treasure County | 15 | 1956 | Low | Not Rated |
| Froze-To-Death #4 Treasure County | 18 | 1954 | Low | Not Rated |
| Froze-To-Death #3 Treasure County | 10 | 1949 | Low | Not Rated |
| Froze-To-Death #11 Treasure County | 12 | 1949 | Low | Not Rated |
| Frog Dam Richland County | 28 | 1973 | Low | Not Rated |
| Frog Blaine County | 46 | 1960 | Low | Not Rated |
| Friez #2 Rosebud County | 25 | 1960 | Low | Not Rated |
| Frey Yellowstone County | 15 | 1930 | Low | Not Rated |
| Fresno Dam Hill County | 111 | 1939 | High | Not Available |
| Freske #1 Sheridan County | 8 | 1934 | Low | Not Rated |
| Frenchman Ir. Company #1 Phillips County | 10 | 1951 | Significant | Not Rated |
| Frenchman Dam Phillips County | 63 | 1953 | Significant | Not Rated |
| French Fry #2 Phillips County | 25 | 1947 | Low | Not Rated |
| French Fry #1 Phillips County | 20 | 1945 | Low | Not Rated |
| French #9 Custer County | 22 | 1947 | Low | Not Rated |
| French #8 Custer County | 20 | 1950 | Low | Not Rated |
| French #5 Custer County | 17 | 1960 | Low | Not Rated |
| French #2 Custer County | 30 | 1947 | Low | Not Rated |
| French #18 Custer County | 18 | 1956 | Low | Not Rated |
| French #17 Rosebud County | 15 | 1953 | Low | Not Rated |
| French #16 Rosebud County | 20 | 1958 | Low | Not Rated |
| French #15 Rosebud County | 22 | 1960 | Low | Not Rated |
| French #12 Custer County | 24 | 1960 | Low | Not Rated |
| French #11 Custer County | 26 | 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.