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 1201–1225 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| La Ze #1 Carter County | 35 | 1960 | Low | Not Rated |
| Lavold Dam Sweet Grass County | 8 | 1913 | Low | Not Rated |
| Latka #5 Richland County | 14 | 1939 | Low | Not Rated |
| Latka Richland County | 14 | 1950 | Low | Not Rated |
| Larson (Garfield) Garfield County | 15 | 1948 | Low | Not Rated |
| Larson #3 Custer County | 14 | 1955 | Low | Not Rated |
| Larson #2 Custer County | 19 | 1963 | Low | Not Rated |
| Larso Garfield County | 15 | 1959 | Low | Not Rated |
| Lars Chouteau County | 66 | 1950 | Low | Not Rated |
| Larry Pilster #2 Carter County | 10 | 1950 | Low | Not Rated |
| Lark Detention Dam Phillips County | 41 | 1968 | Low | Fair |
| Langstaff #1 Carbon County | 25 | 1945 | Low | Not Rated |
| Langohr #1 Rosebud County | 16 | 1965 | Low | Not Rated |
| Lang Corners Phillips County | 8 | 1952 | Low | Not Rated |
| L and L Custer County | 22 | 1939 | Low | Not Rated |
| Landers #1 Park County | 15 | 1949 | Low | Not Rated |
| Landa #2 Powder River County | 18 | 1960 | Low | Not Rated |
| Lammers #1 Wheatland County | 25 | 1984 | Low | Not Rated |
| Lamesteer Dam Wibaux County | 34 | 1938 | Low | Unsatisfactory |
| Lambing Shed Rosebud County | 26 | 1971 | Low | Not Rated |
| Lake Thibadeau Diversion Dam Hill County | 18 | 1938 | Low | Satisfactory |
| Lake Thibadeau Dam Hill County | 18 | 1938 | Low | Poor |
| Lake Seventeen Dam Blaine County | 15 | 1930 | Low | Not Available |
| Lake Rene Lincoln County | 20 | 1950 | Low | Not Rated |
| Lady Bug Rosebud County | 18 | 1957 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.