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 1751–1775 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Heckmiller #1 Custer County | 20 | 1955 | Low | Not Rated |
| Heble Fergus County | 19 | 1954 | Low | Not Rated |
| Hebgen Dam Gallatin County | 120 | 1915 | High | Satisfactory |
| 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 |
| Haypense Garfield County | 12 | 1955 | Low | Not Rated |
| Haymaker Dam Wheatland County | 30 | 1978 | Low | Not Rated |
| Haylodge #2 Hill County | 15 | 1940 | Low | Not Rated |
| Haylodge #1 Hill County | 30 | 1939 | Low | Not Rated |
| Hay Creek Reservoir Rosebud County | 18 | 1940 | Low | Not Rated |
| H A Wyrick #1 Fallon County | 15 | 1954 | Low | Not Rated |
| Hawks Nest #1 Garfield County | 24 | 1950 | Low | Not Rated |
| Havre Reservoir Fergus County | 16 | 1940 | Low | Not Rated |
| Hauso Reservoir #2 Garfield County | 18 | 1960 | Low | Not Rated |
| Hauso Reservoir Garfield County | 20 | 1958 | Low | Not Rated |
| Hauser Dam Lewis and Clark County | 125 | 1911 | High | Satisfactory |
| Haughian #5 Custer County | 18 | 1958 | Low | Not Rated |
| Haughian #16 Custer County | 17 | 1968 | Low | Not Rated |
| Haughian #15 Custer County | 18 | 1952 | Low | Not Rated |
| Haughian #12 Custer County | 20 | 1970 | Low | Not Rated |
| Haughian #10 Custer County | 20 | 1970 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.