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 1851–1875 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Ernie Hudson Stillwater County | 45 | 1928 | Low | Not Rated |
| Ernie #1 Dam Musselshell County | 17 | — | Low | Not Rated |
| Ernest Wallstein Dam Carter County | 36 | — | Low | Poor |
| Ernest Phillips County | 25 | 1938 | Low | Not Rated |
| Erickson L&L #5 Rosebud County | 20 | 1940 | Low | Not Rated |
| Erickson #4 Rosebud County | 18 | 1931 | Low | Not Rated |
| Erickson #3 Rosebud County | 14 | 1957 | Low | Not Rated |
| Erickson #2 Rosebud County | 25 | 1945 | Low | Not Rated |
| Erickson Richland County | 23 | 1950 | Low | Not Rated |
| Erb #1 Big Horn County | 16 | 1965 | Low | Not Rated |
| Epstlon Blaine County | 15 | 1940 | Low | Not Rated |
| Epiphany Hill County | 8 | 1960 | Low | Not Rated |
| Engstrom Sheridan County | 24 | 1967 | Low | Not Rated |
| Engdall Reservoir #2 Garfield County | 25 | 1934 | Low | Not Rated |
| Engdall Reservoir #1 Garfield County | 30 | 1937 | Low | Not Rated |
| Engdahl #7 Garfield County | 24 | 1940 | Low | Not Rated |
| Engdahl #6 Garfield County | 23 | 1950 | Low | Not Rated |
| Engdahl #5 Garfield County | 17 | 1940 | Low | Not Rated |
| Engdahl #4 Garfield County | 25 | 1950 | Low | Not Rated |
| Emmons #1 Powder River County | 20 | 1955 | Low | Not Rated |
| Emma #1 Garfield County | 14 | 1962 | Low | Not Rated |
| Elroy Richland County | 15 | 1960 | Low | Not Rated |
| Ellsworth Valley County | 15 | 1963 | Low | Not Rated |
| Elloam Ass.Reservoir Blaine County | 25 | 1903 | Low | Not Rated |
| E L Johnson #1 Rosebud County | 30 | 1935 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.