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 2001–2025 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Robertson Reservoir Garfield County | 24 | 1959 | Low | Not Rated |
| Robin Hood #1 Meagher County | 25 | 1965 | Low | Not Rated |
| Robinson Phillips County | 30 | 1945 | Low | Not Rated |
| Robinson #1 Custer County | 28 | 1940 | Low | Not Rated |
| Robinson #2 Custer County | 26 | 1942 | Low | Not Rated |
| Robinson #3 Custer County | 28 | 1956 | Low | Not Rated |
| Robinson #4 Custer County | 33 | 1940 | Low | Not Rated |
| Robinson #7 Custer County | 19 | 1950 | Low | Not Rated |
| Robinson #8 Custer County | 21 | 1944 | Low | Not Rated |
| Robinson #9 Custer County | 20 | 1964 | Low | Not Rated |
| Rock Creek Beaverhead County | 15 | 1965 | Low | Not Rated |
| Rock Creek Lake Dam Powell County | 25 | 1900 | Low | Not Rated |
| Rockport Colony #1 Teton County | 7 | 1960 | Low | Not Rated |
| Rockport Colony #2 Teton County | 15 | 1960 | Low | Not Rated |
| Rock Springs Rosebud County | 15 | 1949 | Low | Not Rated |
| Rocky Phillips County | 25 | 1947 | Low | Not Rated |
| Rocky #1 Phillips County | 10 | 1931 | Low | Not Rated |
| Rocky #2 Phillips County | 10 | 1971 | Low | Not Rated |
| Rocky Mountain High Toole County | 20 | 1900 | Low | Not Rated |
| Rodgers Custer County | 27 | 1936 | Low | Not Rated |
| Rogers #2 Custer County | 23 | 1960 | Low | Not Rated |
| Rolph #1 Carter County | 15 | 1948 | Low | Not Rated |
| Romain F. Pond Chouteau County | 25 | 1952 | Low | Not Rated |
| Romo Valley County | 25 | 1962 | Low | Not Rated |
| Ron Jacobson Dam Lake County | 25 | 1977 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.