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 1501–1525 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Hewitt Dam Phillips County | 10 | 1938 | Low | Poor |
| Hess Fergus County | 20 | 1930 | Low | Not Rated |
| Heslo McCone County | 10 | 1942 | Low | Not Rated |
| Herzog #3 Custer County | 21 | 1955 | Low | Not Rated |
| Herzog #2 Custer County | 20 | 1973 | Low | Not Rated |
| Herzog #1 Custer County | 30 | 1952 | Low | Not Rated |
| Herrin Lake Lewis and Clark County | 15 | 1949 | Low | Not Rated |
| Herman #1 Phillips County | 20 | 1930 | Low | Not Rated |
| Hensleigh #2 Garfield County | 18 | 1950 | Low | Not Rated |
| Henry Dam #2 Toole County | 33 | 1963 | Low | Not Rated |
| Henry Dam #1 Toole County | 12 | 1948 | Low | Not Rated |
| Helluva Fergus County | 22 | 1956 | Low | Not Rated |
| Helen B Dent Dam Carter County | 37 | — | Low | Satisfactory |
| Helen B Carter County | 81 | 1966 | Low | Not Rated |
| Heifer Pen McCone County | 24 | 1950 | Low | Not Rated |
| Hedstorm Reservoir McCone County | 24 | 1936 | Low | Not Rated |
| Hediger Daniels County | 26 | 1971 | Low | Not Rated |
| Heckmiller #1 Custer County | 20 | 1955 | Low | Not Rated |
| Heble Fergus County | 19 | 1954 | Low | Not Rated |
| Hearst Lake Deer Lodge County | 9 | 1898 | Low | Not Rated |
| Heapby Reservoir Deer Lodge County | 15 | 1958 | Low | Not Rated |
| Headman Dam Petroleum County | 30 | — | Low | Not Rated |
| H C Brown #1 Big Horn County | 20 | 1961 | Low | Not Rated |
| Haystack Blaine County | 20 | 1940 | Low | Not Rated |
| Hays Garfield 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.