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 426–450 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Stella #1 Golden Valley County | 20 | 1966 | Low | Not Rated |
| Steinreisser #10 Richland County | 20 | 1955 | Significant | Not Rated |
| Steinhilber Reservoir Big Horn County | 30 | 1930 | Low | Not Rated |
| Steffen Dawson County | 14 | 1936 | Low | Not Rated |
| Stauffer Chemical #1 Silver Bow County | 47 | 1954 | Low | Not Rated |
| State-Murphy Dam McCone County | 15 | 1936 | Low | Not Rated |
| State-Klamert Petroleum County | 32 | — | Low | Not Rated |
| State #3 Liberty County | 25 | 1938 | Low | Not Rated |
| Stark Dam Fallon County | 20 | 1945 | Low | Not Rated |
| Staples Glacier County | 25 | 1950 | Low | Not Rated |
| Stanley Steamer Hill County | 12 | 1965 | Low | Not Rated |
| Standley Irrigation Dam Teton County | 15 | 1977 | Low | Not Rated |
| Standish #5 Rosebud County | 22 | 1959 | Low | Not Rated |
| Standish #4 Rosebud County | 18 | 1953 | Low | Not Rated |
| Standish #3 Rosebud County | 14 | 1950 | Low | Not Rated |
| Standish #1 Rosebud County | 18 | 1955 | Low | Not Rated |
| Staff #2 Blaine County | 30 | 1914 | Low | Not Rated |
| Staff #1 Blaine County | 10 | 1910 | Significant | Not Rated |
| S&S Kurth #1 Yellowstone County | 35 | 1940 | Low | Not Rated |
| Squiggles #2 Chouteau County | 15 | 1965 | Low | Not Rated |
| Squiggles #1 Chouteau County | 25 | 1965 | Low | Not Rated |
| Square Butte Detention Dam Phillips County | 42 | 1967 | Low | Poor |
| Spun Cascade County | 15 | 1960 | Significant | Not Rated |
| Springtime #1 Stillwater County | 12 | 1971 | Low | Not Rated |
| Spring-Miller Garfield County | 25 | 1958 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.