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 1126–1150 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Grove Gulch Silver Bow County | 30 | 1964 | Low | Not Rated |
| Grubb Dam Pondera County | 25 | — | Low | Not Rated |
| Grub Detention Dam Valley County | 21 | 1964 | Low | Unsatisfactory |
| Grumpy Carter County | 20 | 1961 | Low | Not Rated |
| Gruszie Blaine County | 20 | 1935 | Low | Not Rated |
| Guelff Dawson County | 15 | 1946 | Low | Not Rated |
| Guesanborn Garfield County | 20 | 1936 | Low | Not Rated |
| Guesenburu, Michel Garfield County | 25 | 1966 | Low | Not Rated |
| Gull Wing Detention Dam Phillips County | 27 | 1968 | Low | Unsatisfactory |
| Gumbo #3 Custer County | 22 | 1959 | Low | Not Rated |
| Gumbo #4 Custer County | 17 | 1948 | Low | Not Rated |
| Gus Richland County | 30 | 1943 | Low | Not Rated |
| Gussie #2 Carter County | 25 | 1940 | Low | Not Rated |
| Gussie #3 Carter County | 22 | 1975 | Low | Not Rated |
| Guthridge Rosebud County | 30 | 1967 | Low | Not Rated |
| Gutshot Detention Dam Valley County | 38 | 1965 | Low | Unsatisfactory |
| Guttormson #1 Phillips County | 14 | 1943 | Low | Not Rated |
| Ha-Choo Toole County | 8 | 1908 | Low | Not Rated |
| Hacker Dam Madison County | 34 | 1953 | Low | Not Rated |
| Hagerty Glacier County | 15 | 1942 | Low | Not Rated |
| Haglof Reservoir Garfield County | 15 | 1949 | Low | Not Rated |
| Haines Reservoir Treasure County | 15 | 1950 | Low | Not Rated |
| Hainie Reservoir McCone County | 19 | 1942 | Low | Not Rated |
| Half Barrel Detention Dam Valley County | 21 | 1956 | Low | Unsatisfactory |
| Half-Pint Teton County | 25 | 1960 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.