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 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Harold #1 Garfield County | 15 | 1965 | Low | Not Rated |
| Harold #3 Garfield County | 18 | 1940 | Low | Not Rated |
| Harris #1 Petroleum County | 14 | 1975 | Low | Not Rated |
| Harstad #1 Rosebud County | 26 | 1968 | Low | Not Rated |
| Harvard McCone County | 30 | 1955 | Low | Not Rated |
| Harvey Lake Teton County | 26 | 1941 | Significant | Not Rated |
| Has A Name Stillwater County | 12 | 1938 | Low | Not Rated |
| Hasland #2 Sheridan County | 15 | 1946 | Low | Not Rated |
| Hassett #1 Petroleum County | 30 | 1944 | Low | Not Rated |
| Hassett #2 Petroleum County | 15 | 1959 | Low | Not Rated |
| Hassett #3 Petroleum County | 30 | 1958 | Low | Not Rated |
| Hastetter #1 Richland County | 12 | 1950 | Low | Not Rated |
| Hastetter #2 Richland County | 12 | 1950 | Low | Not Rated |
| Hauf Lake Ravalli County | 16 | 1937 | Low | Not Rated |
| Haughan #2 Custer County | 28 | 1973 | Low | Not Rated |
| Haughian #10 Custer County | 20 | 1970 | Low | Not Rated |
| Haughian #12 Custer County | 20 | 1970 | Low | Not Rated |
| Haughian #15 Custer County | 18 | 1952 | Low | Not Rated |
| Haughian #16 Custer County | 17 | 1968 | Low | Not Rated |
| Haughian #5 Custer County | 18 | 1958 | Low | Not Rated |
| Hauser Dam Lewis and Clark County | 125 | 1911 | High | Satisfactory |
| Hauso Reservoir Garfield County | 20 | 1958 | Low | Not Rated |
| Hauso Reservoir #2 Garfield County | 18 | 1960 | Low | Not Rated |
| Havre Reservoir Fergus County | 16 | 1940 | Low | Not Rated |
| Hawks Nest #1 Garfield County | 24 | 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.