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 1401–1425 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Larson #3 Custer County | 14 | 1955 | Low | Not Rated |
| Larson (Garfield) Garfield County | 15 | 1948 | Low | Not Rated |
| Latka Richland County | 14 | 1950 | Low | Not Rated |
| Latka #5 Richland County | 14 | 1939 | Low | Not Rated |
| Lavold Dam Sweet Grass County | 8 | 1913 | Low | Not Rated |
| La Ze #1 Carter County | 35 | 1960 | Low | Not Rated |
| Lazy E Bar 9 Fallon County | 20 | 1954 | Low | Not Rated |
| Lazy Jackson Beaverhead County | 10 | 1950 | Low | Not Rated |
| Lazy J-D #1 Phillips County | 30 | 1952 | Low | Not Rated |
| Lazy Jd #10 Fergus County | 30 | 1958 | Low | Not Rated |
| Lazy Jd #12 Phillips County | 30 | 1959 | Low | Not Rated |
| Lazy J-D #2 Phillips County | 25 | 1959 | Low | Not Rated |
| Lazy J-D #4 Phillips County | 30 | 1972 | Low | Not Rated |
| Lazy S #2 Custer County | 17 | 1966 | Low | Not Rated |
| L Cline #1 Carter County | 12 | 1961 | Low | Not Rated |
| Leachman #1 Yellowstone County | 20 | 1965 | Low | Not Rated |
| Leachman #2 Yellowstone County | 12 | 1965 | Low | Not Rated |
| Leachman #4 Yellowstone County | 20 | 1979 | Low | Not Rated |
| Lee #11 Rosebud County | 15 | 1950 | Low | Not Rated |
| Lee #12 Rosebud County | 20 | 1965 | Low | Not Rated |
| Lee #13 Rosebud County | 15 | 1950 | Low | Not Rated |
| Lee #6 Rosebud County | 20 | 1959 | Low | Not Rated |
| Lee #9 Rosebud County | 20 | 1963 | Low | Not Rated |
| Leepin'Antelope Chouteau County | 13 | 1941 | Low | Not Rated |
| Lee, S.A. #1 Dawson County | 22 | 1963 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.