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 2376–2400 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Creedman Coulee Dam Hill County | 22 | 1938 | Low | Fair |
| Crazy Sombreo Meagher County | 58 | 1950 | Significant | Not Rated |
| Crazy Mountain Ranch Park County | 36 | 1968 | High | Satisfactory |
| Crazy Creek Reservoir Fergus County | 30 | 1946 | Low | Not Rated |
| Crandall Reservoir Roosevelt County | 20 | 1937 | Low | Not Rated |
| Cramer (Sweet Grass) Sweet Grass County | 15 | 1960 | Low | Not Rated |
| Cracker Pondera County | 35 | 1915 | Significant | Not Rated |
| Cowpath Dam Toole County | 65 | 1967 | High | Satisfactory |
| Cow Creek Blaine County | 43 | — | Significant | Not Rated |
| Cowan Reservoir Chouteau County | 20 | 1936 | Low | Not Rated |
| Courtney Herefords #3 Carter County | 14 | 1960 | Low | Not Rated |
| Coulter #2 Garfield County | 25 | 1956 | Low | Not Rated |
| Coulter #1 Garfield County | 25 | 1955 | Low | Not Rated |
| Couch Coulee #3 Hill County | 15 | 1941 | Low | Not Rated |
| Couch Coulee #2 Hill County | 20 | 1940 | Low | Not Rated |
| Couch Coulee #1 Hill County | 16 | 1918 | Low | Not Rated |
| Cottonwood Grazing #4 Dam Phillips County | 16 | — | Low | Not Rated |
| Cottonwood Grazing #2 Phillips County | 12 | 1954 | Low | Not Rated |
| Cottonwood Dam (Park) Park County | 39 | 1953 | High | Poor |
| Cottonwood Fergus County | 38 | 1964 | Low | Not Rated |
| Cotter Phillips County | 20 | 1950 | Low | Not Rated |
| Costly Coulee Reservoir Teton County | 15 | 1950 | Low | Not Rated |
| Costich Dam Lincoln County | 29 | 1956 | High | Satisfactory |
| Cosmic Nick Madison County | 15 | 1956 | Low | Not Rated |
| Corvette Richland County | 20 | 1950 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.