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 1976–2000 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Remulac Valley County | 15 | 1930 | Low | Not Rated |
| R E Peterson #1 Big Horn County | 10 | 1953 | Low | Not Rated |
| R Ereaux #1 Phillips County | 10 | 1962 | Low | Not Rated |
| Re-Regulating Stillwater County | 15 | 1979 | Low | Satisfactory |
| Reser Dam Blaine County | 37 | 1980 | Low | Unsatisfactory |
| Reservoir Lake Beaverhead County | 9 | 1920 | Low | Not Rated |
| Rey Garfield County | 17 | 1957 | Low | Not Rated |
| R Garst #1 Powder River County | 17 | 1954 | Low | Not Rated |
| R Garst #2 Powder River County | 22 | 1953 | Low | Not Rated |
| Richardson Rosebud County | 17 | 1936 | Low | Not Rated |
| Richey, Roy Dawson County | 20 | 1938 | Low | Not Rated |
| Richmond (Blaine) Blaine County | 15 | 1939 | Low | Not Rated |
| Rigby, South Pondera County | 15 | 1918 | Low | Not Rated |
| Rindal Fergus County | 28 | 1938 | Low | Not Available |
| Ringling #1 Carter County | 20 | 1960 | Low | Not Rated |
| Ringstveit Reservoir Rosebud County | 23 | 1976 | Low | Not Rated |
| R-Janssen #1 Powder River County | 24 | 1953 | Low | Not Rated |
| R Maier Fallon County | 18 | 1955 | Low | Not Rated |
| Road Reservoir Valley County | 10 | 1950 | Low | Not Rated |
| Roamin'Reservoir Chouteau County | 30 | 1950 | Low | Not Rated |
| Robbie (Teton) Teton County | 8 | 1940 | Low | Not Rated |
| Robert Bold #2 Fergus County | 20 | 1960 | Low | Not Rated |
| Robert Bold #3 Fergus County | 10 | 1958 | Low | Not Rated |
| Robert Johnson Richland County | 17 | 1937 | Low | Not Rated |
| Robertson (Chouteau) Chouteau County | 20 | 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.