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 1351–1375 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| L Galt #17 Rosebud County | 8 | 1959 | Low | Not Rated |
| Lewis Dam #1 Pd Petroleum County | 26 | — | Low | Not Rated |
| Leveque Reservoir Cascade County | 10 | 1930 | Low | Not Rated |
| Letz Lake Pondera County | 30 | 1952 | Low | Not Rated |
| Lester Peters #1 Toole County | 27 | 1958 | Low | Not Rated |
| Lester #1 Carbon County | 25 | 1941 | Low | Not Rated |
| Lepus Missoula County | 30 | 1956 | Low | Not Rated |
| Leo Bergtoll Irrigation Dam Valley County | 17 | 1981 | Low | Not Rated |
| Leo #2 Fallon County | 20 | 1954 | Low | Not Rated |
| Leo Richland County | 15 | 1965 | Low | Not Rated |
| Lenhart #5 Hill County | 20 | 1938 | Low | Not Rated |
| Lemon Hart Carter County | 27 | 1960 | Low | Not Rated |
| Leland #1 Custer County | 20 | 1959 | Low | Not Rated |
| Leidholt Dam Custer County | 30 | — | Low | Not Rated |
| Lefdehl Phillips County | 15 | 1928 | Low | Not Rated |
| Lee Sa #2 Richland County | 30 | 1962 | Low | Not Rated |
| Lee, S.A. #1 Dawson County | 22 | 1963 | Low | Not Rated |
| Leepin'Antelope Chouteau County | 13 | 1941 | Low | Not Rated |
| Lee #9 Rosebud County | 20 | 1963 | Low | Not Rated |
| Lee #6 Rosebud County | 20 | 1959 | Low | Not Rated |
| Lee #13 Rosebud County | 15 | 1950 | Low | Not Rated |
| Lee #12 Rosebud County | 20 | 1965 | Low | Not Rated |
| Lee #11 Rosebud County | 15 | 1950 | Low | Not Rated |
| Lebo #3,East Dam Wheatland County | 27 | 1973 | High | Satisfactory |
| Lebo #2 Ne Dam Wheatland County | 15 | 1969 | Significant | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.