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 2576–2600 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Stillwater Hertzler Tailings Dam Stillwater County | — | — | High | Satisfactory |
| Stillwater Nye Tailings Dam Stillwater County | — | — | High | Satisfactory |
| Stinebaugh #1 Garfield County | 25 | 1971 | Low | Not Rated |
| Stinebaugh #2 Garfield County | 30 | 1972 | Low | Not Rated |
| Stone Ranch Dam Fergus County | 40 | 2001 | Low | Not Rated |
| Stony Lake Sanders County | 8 | 1979 | Low | Not Rated |
| Storm Lake Dam Deer Lodge County | 29 | 1898 | High | Poor |
| Stoyanoff Meagher County | 50 | 1947 | Low | Not Rated |
| Stratton Reservoir Phillips County | 16 | 1945 | Low | Not Rated |
| Stroud Garfield County | 20 | 1949 | Low | Not Rated |
| Structure No 149 Roosevelt County | 15 | 1937 | Low | Not Rated |
| Strudy Dam Toole County | 15 | 1950 | Low | Not Rated |
| Stub Daniels County | 18 | 1948 | Low | Not Rated |
| Stump Retention Dam Powder River County | 31 | 2003 | Low | Not Rated |
| Sturgis Richland County | 28 | 1970 | Low | Not Rated |
| Styer #2 Fergus County | 24 | 1961 | Low | Not Rated |
| Sugar Blaine County | 38 | 1940 | Low | Not Rated |
| Sullivan Dam Toole County | 68 | 1967 | High | Satisfactory |
| Sumo Chouteau County | 20 | 1934 | Low | Not Rated |
| Sun Coulee Rosebud County | 27 | 1956 | Low | Not Rated |
| Sunday Creek Reservoir Rosebud County | 18 | 1953 | Low | Not Rated |
| Sunday Milk Phillips County | 15 | 1958 | Low | Not Rated |
| Sundial Custer County | 33 | 1950 | Low | Not Rated |
| Sunny Blaine County | 20 | 1955 | Low | Not Rated |
| Sunny Bueno Cascade County | 30 | 1953 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.