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 1876–1900 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Eliasson (Petroleum) Petroleum County | 19 | 1939 | Low | Not Rated |
| Elias #1 Blaine County | 15 | 1965 | Low | Not Rated |
| Elder Elmer Cascade County | 36 | 1953 | Low | Not Rated |
| Eightmile Spring Chouteau County | 15 | 1953 | Low | Not Rated |
| Eide Trail Toole County | 15 | 1952 | Low | Not Rated |
| Ehret Land Reservoir Fallon County | 12 | 1963 | Low | Not Rated |
| Ehret #1 Fallon County | 30 | 1944 | Low | Not Rated |
| E Hardy #4 Custer County | 24 | 1974 | Low | Not Rated |
| E Hardy #2 Custer County | 20 | 1961 | Low | Not Rated |
| Eggebrecht Dam Lake County | 35 | 1977 | Low | Not Rated |
| Edwards Reservoir Garfield County | 15 | 1956 | Low | Not Rated |
| Edward Lanning #2 Carter County | 15 | 1960 | Low | Not Rated |
| Edward Lanning #1 Carter County | 20 | 1970 | Low | Not Rated |
| Edward Enterprises Hill County | 30 | 1978 | Low | Not Rated |
| Ed Styer #5 Fergus County | 25 | 1930 | Low | Not Rated |
| Ed Styer #4 Fergus County | 20 | 1949 | Low | Not Rated |
| Ed Styer #3 Fergus County | 30 | 1958 | Low | Not Rated |
| Ed Styer #2 Fergus County | 20 | 1963 | Low | Not Rated |
| Ed Rath #1 Carter County | 15 | 1940 | Low | Not Rated |
| Ed Mcintyre Toole County | 15 | 1889 | Low | Not Rated |
| Eddie #6 Valley County | 7 | 1970 | Low | Not Rated |
| Eddie #2 Valley County | 20 | 1950 | Low | Not Rated |
| Eddie #1 Valley County | 15 | 1969 | Low | Not Rated |
| Echo Reservoir Liberty County | 18 | 1950 | Low | Not Rated |
| E B Ranch #1 Powder River County | 30 | 1956 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.