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 1626–1650 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Grove Gulch Silver Bow County | 30 | 1964 | Low | Not Rated |
| Groh Stock McCone County | 24 | 1938 | Low | Not Rated |
| Groh #1 McCone County | 35 | 1954 | Low | Not Rated |
| Gritty Milk Hill County | 30 | 1938 | Low | Not Rated |
| Grimes Dam Custer County | 16 | 1950 | Low | Not Rated |
| Griffith Wheatland County | 15 | 1959 | Low | Not Rated |
| Griffin #2 Custer County | 20 | 1956 | Low | Not Rated |
| Griffin Custer County | 29 | 1972 | Low | Not Rated |
| Grierson #1 Treasure County | 15 | 1958 | Low | Not Rated |
| Gregg #1 Garfield County | 22 | 1960 | Low | Not Rated |
| Greenwood #2 Valley County | 27 | 1970 | Low | Not Rated |
| Green Lake Dam Pondera County | 13 | 1939 | Low | Not Available |
| Green Hollow #2 | 37 | — | Low | Not Rated |
| Green Coulee Dam Garfield County | 20 | 1960 | Low | Not Rated |
| Green #6 Powder River County | 13 | 1943 | Low | Not Rated |
| Green #5 Powder River County | 14 | 1969 | Low | Not Rated |
| Green #4 Powder River County | 20 | 1970 | Low | Not Rated |
| Grebe #1 Rosebud County | 20 | 1970 | Low | Not Rated |
| Grazing Antelope Wheatland County | 10 | 1978 | Low | Not Rated |
| Gray #3 Custer County | 26 | 1949 | Low | Not Rated |
| Gray #2 Custer County | 20 | 1939 | Low | Not Rated |
| Gray 13 Rosebud County | 20 | 1940 | Low | Not Available |
| Gray #1 Custer County | 18 | 1947 | Low | Not Rated |
| Gravely Powell County | 25 | 1973 | Low | Not Rated |
| Grasshopper Blaine County | 31 | 1930 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.