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 576–600 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Conleys Lake (Powell) Powell County | 11 | 1958 | Low | Not Rated |
| Conover #1 Yellowstone County | 15 | 1970 | Low | Not Rated |
| Conover #2 Yellowstone County | 25 | 1974 | Low | Not Rated |
| Cool Black Rock Hill County | 30 | 1919 | Low | Not Rated |
| Cool Cotton Hill County | 20 | 1938 | Significant | Not Rated |
| Coon Richland County | 15 | 1950 | Low | Not Rated |
| Cooney Carbon County | 102 | 1937 | High | Poor |
| Cooper Adams #1 Fergus County | 18 | 1950 | Low | Not Rated |
| Cooper-Adams #4 Fergus County | 15 | 1960 | Low | Not Rated |
| Cooper-Adams #5 Fergus County | 13 | 1950 | Low | Not Rated |
| Cooper-Adams #6 Fergus County | 13 | 1960 | Low | Not Rated |
| Cope Fergus County | 16 | 1960 | Low | Not Rated |
| Cornhuskers Sheridan County | 25 | 1939 | Low | Not Rated |
| Cornwell Valley County | 23 | 1952 | Significant | Not Rated |
| Corral Junction Detention #2 Dam Valley County | 20 | 1954 | Low | Unsatisfactory |
| Corvette Richland County | 20 | 1950 | Low | Not Rated |
| Cosmic Nick Madison County | 15 | 1956 | Low | Not Rated |
| Costich Dam Lincoln County | 29 | 1956 | High | Satisfactory |
| Costly Coulee Reservoir Teton County | 15 | 1950 | Low | Not Rated |
| Cotter Phillips County | 20 | 1950 | Low | Not Rated |
| Cottonwood Fergus County | 38 | 1964 | Low | Not Rated |
| Cottonwood Dam (Park) Park County | 39 | 1953 | High | Poor |
| Cottonwood Grazing #2 Phillips County | 12 | 1954 | Low | Not Rated |
| Cottonwood Grazing #4 Dam Phillips County | 16 | — | Low | Not Rated |
| Couch Coulee #1 Hill County | 16 | 1918 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.