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 151–175 of 193
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Salsbury (Richland) Richland County | 24 | 1965 | Significant | Not Rated |
| Sanders Lake Dam #1 North Missoula County | 10 | 1913 | Significant | Not Rated |
| Sand Rock Carter County | 27 | 1937 | Significant | Not Rated |
| Sands Lake East Dike Hill County | 6 | 1911 | Significant | Not Rated |
| Sands Lake North Dam Hill County | 11 | 1911 | Significant | Not Rated |
| Shay Dam Toole County | 15 | 1915 | Significant | Not Rated |
| Shotgun Creek Dike #2 Roosevelt County | 10 | 1930 | Significant | Not Rated |
| Shotgun Creek Dike #3 Roosevelt County | 8 | 1930 | Significant | Not Rated |
| Smith Lake Lewis and Clark County | 15 | 1954 | Significant | Not Rated |
| Smurfit-Stone Container Storage Ponds Missoula County | 25 | — | Significant | Not Rated |
| Soda Creek Carter County | 15 | 1937 | Significant | Not Rated |
| South Fork Reservoir Silver Bow County | 20 | 1946 | Significant | Not Rated |
| South Sandstone Creek Dam Fallon County | 49 | 1975 | Significant | Not Rated |
| Sportsman Fallon County | 28 | 1955 | Significant | Not Rated |
| Spring Creek Missoula County | 15 | 1951 | Significant | Not Rated |
| Spun Cascade County | 15 | 1960 | Significant | Not Rated |
| Staff #1 Blaine County | 10 | 1910 | Significant | Not Rated |
| Steinreisser #10 Richland County | 20 | 1955 | Significant | Not Rated |
| Sunrise Lake Madison County | 14 | 1916 | Significant | Not Rated |
| Supenau Lake Hill County | 40 | 1959 | Significant | Not Rated |
| Sweet Carolyn Valley County | 26 | 1958 | Significant | Not Rated |
| Tailings Impoundment Madison County | 155 | — | Significant | Not Rated |
| Tarum #2 Valley County | 18 | 1952 | Significant | Not Rated |
| Thornton Lake Dam Deer Lodge County | 11 | 1904 | Significant | Not Rated |
| Torger Dam Petroleum County | 18 | 1976 | Significant | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.