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 2501–2525 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Snake Blaine County | 18 | 1930 | Low | Not Rated |
| Snake Butte Reservoir Blaine County | 10 | 1937 | Low | Not Rated |
| Snake Ranch Blaine County | 12 | 1930 | Low | Not Rated |
| Sneezie Carter County | 20 | 1969 | Low | Not Rated |
| Snortland Dam Pondera County | 20 | 1940 | Low | Not Rated |
| Snowfall McCone County | 20 | 1930 | Low | Not Rated |
| Snow White Carter County | 14 | 1963 | Low | Not Rated |
| Snowy Mountain Musselshell County | 15 | 1960 | Low | Not Rated |
| Soap Creek Lewis and Clark County | 25 | 1950 | Low | Not Rated |
| Sob Detention Dam Valley County | 29 | 1966 | Low | Poor |
| Soda Creek Carter County | 15 | 1937 | Significant | Not Rated |
| Sonny #1 Garfield County | 14 | 1950 | Low | Not Rated |
| Sour Apple Chouteau County | 30 | 1930 | Low | Not Rated |
| South Axolotl Lake Dam Madison County | 15 | — | Low | Unsatisfactory |
| South Beaver Detention Dam Valley County | 24 | 1957 | Low | Unsatisfactory |
| Southerland Lacosta Garfield County | 21 | 1957 | Low | Not Rated |
| South Fork Detention Dam Prairie County | 28 | 1964 | Low | Poor |
| South Fork Dry Blood Creek Detention Dam Petroleum County | 36 | 1963 | Low | Fair |
| South Fork Reservoir Silver Bow County | 20 | 1946 | Significant | Not Rated |
| South Meadow Creek Dam Madison County | 22 | 1968 | High | Not Available |
| South Sandstone Creek Dam Fallon County | 49 | 1975 | Significant | Not Rated |
| South Side Detention Dam Carbon County | 47 | — | Low | Poor |
| Spaniard Cascade County | 42 | 1962 | Low | Not Rated |
| Sparrow Pond Dam Beaverhead County | 7 | 1965 | Low | Poor |
| Sparrow Slough Dam Beaverhead County | 14 | 1985 | Low | Fair |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.