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 1251–1275 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Henry Dam #1 Toole County | 12 | 1948 | Low | Not Rated |
| Henry Dam #2 Toole County | 33 | 1963 | Low | Not Rated |
| Hensleigh #2 Garfield County | 18 | 1950 | Low | Not Rated |
| Herman #1 Phillips County | 20 | 1930 | Low | Not Rated |
| Herrin Lake Lewis and Clark County | 15 | 1949 | Low | Not Rated |
| Herzog #1 Custer County | 30 | 1952 | Low | Not Rated |
| Herzog #2 Custer County | 20 | 1973 | Low | Not Rated |
| Herzog #3 Custer County | 21 | 1955 | Low | Not Rated |
| Heslo McCone County | 10 | 1942 | Low | Not Rated |
| Hess Fergus County | 20 | 1930 | Low | Not Rated |
| Hewitt Dam Phillips County | 10 | 1938 | Low | Poor |
| Hey Joe Reservoir Fergus County | 25 | 1962 | Low | Not Rated |
| Hey Ray #2 Chouteau County | 61 | 1958 | Low | Not Rated |
| Higgins Brothers #1 Meagher County | 15 | 1936 | Significant | Not Rated |
| Higham Dam Lincoln County | 8 | 1945 | Low | Not Rated |
| High Lake Ravalli County | 30 | 1938 | High | Poor |
| Hill #2 Garfield County | 25 | 1954 | Low | Not Rated |
| Hillbilly Phillips County | 10 | 1960 | Low | Not Rated |
| Hilldale Colony Hill County | 16 | 1964 | Low | Not Rated |
| Hillkleberry Coulee Toole County | 30 | 1954 | Low | Not Rated |
| Hillside (Lake) Lake County | 30 | — | Low | Not Rated |
| Hilstad McCone County | 20 | 1952 | Low | Not Rated |
| Him Toole County | 10 | 1900 | Low | Not Rated |
| Hines #1 Prairie County | 20 | 1950 | Low | Not Rated |
| Hines #2 Prairie County | 17 | 1950 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.