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 101–125 of 188
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Isaac Creek Missoula County | 32 | 1948 | High | Satisfactory |
| Hungry Horse Dam Flathead County | 564 | 1953 | High | Not Available |
| Hubbart Flathead County | 130 | 1923 | High | Poor |
| Holter Dam Lewis and Clark County | 124 | 1918 | High | Satisfactory |
| Hinman Dam Lewis and Clark County | 34 | 2000 | High | Not Rated |
| High Lake Ravalli County | 30 | 1938 | High | Poor |
| Hell Roaring Lake County | 30 | 1916 | High | Unsatisfactory |
| Helena Valley Dam Lewis and Clark County | 94 | 1959 | High | Not Available |
| Hebgen Dam Gallatin County | 120 | 1915 | High | Satisfactory |
| Hauser Dam Lewis and Clark County | 125 | 1911 | High | Satisfactory |
| Hanson Creek Dam Fergus County | 72 | 1974 | High | Satisfactory |
| Green Hollow Creek Dam Madison County | 45 | 1990 | High | Satisfactory |
| Golden Sunlight #2 Tailings Dam Jefferson County | — | — | High | Satisfactory |
| Glen Lake Lincoln County | 14 | 1950 | High | Poor |
| Glacier Lake South Dam Carbon County | 20 | 1937 | High | Satisfactory |
| Glacier Lake North Dam Carbon County | 57 | 1937 | High | Satisfactory |
| Gibson Dam Teton County | 199 | 1929 | High | Not Available |
| Georgetown Dam Deer Lodge County | 55 | 1900 | High | Satisfactory |
| Gartside Richland County | 31 | 1962 | High | Satisfactory |
| Fresno Dam Hill County | 111 | 1939 | High | Not Available |
| Fred Burr Lake (Granite) Granite County | 21 | 1930 | High | Satisfactory |
| Four Horns Glacier County | 50 | 1915 | High | Satisfactory |
| Fort Peck Dam McCone County | 256 | 1940 | High | Not Available |
| Flower Creek Dam Lincoln County | 59 | 2016 | High | Satisfactory |
| Eureka Reservoir West Dike Teton County | 12 | 1936 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.