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 1951–1975 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Rattlesnake Dam Dawson County | 22 | 1962 | Low | Satisfactory |
| Rattlesnake Reservoir Yellowstone County | 14 | 1909 | Low | Not Rated |
| Ratzburg,D Toole County | 20 | 1939 | Low | Not Rated |
| Ratzburg,M Toole County | 15 | 1924 | Low | Not Rated |
| Ratzburg'S Army Toole County | 25 | 1945 | Low | Not Rated |
| Ray Chouteau County | 12 | 1956 | Low | Not Rated |
| Ray Jeffers #1 Golden Valley County | 18 | 1938 | Low | Not Rated |
| Raymond (Phillips) Phillips County | 15 | 1940 | Low | Not Rated |
| R Burton #1 Yellowstone County | 15 | 1979 | Low | Not Rated |
| R C Mothershead #1 McCone County | 17 | 1942 | Low | Not Rated |
| R Downs #10 Big Horn County | 8 | 1950 | Low | Not Rated |
| R Downs #4 Big Horn County | 17 | 1950 | Low | Not Rated |
| R Downs #5 Big Horn County | 13 | 1950 | Low | Not Rated |
| R Downs #6 Big Horn County | 19 | 1950 | Low | Not Rated |
| R Downs #7 Big Horn County | 15 | 1961 | Low | Not Rated |
| Reagan Lake Glacier County | 37 | 1967 | Low | Not Rated |
| Real Close Gallatin County | 15 | 1963 | Low | Not Rated |
| Really Red Lewis and Clark County | 10 | 1953 | Low | Not Rated |
| R.E. Braun Chouteau County | 20 | 1948 | Low | Not Rated |
| Redeen #2 Rosebud County | 21 | 1953 | Low | Not Rated |
| Reed #4 Custer County | 16 | 1952 | Low | Not Rated |
| Reed #5 Custer County | 25 | 1952 | Low | Not Rated |
| Reeves Fergus County | 20 | 1930 | Low | Not Rated |
| Reichert #1 Custer County | 16 | 1944 | Low | Not Rated |
| Reinemer McCone County | 18 | 1939 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.