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 2101–2125 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Complimentary Judith Basin County | 30 | 1950 | Low | Not Rated |
| Colvin #2 Custer County | 13 | 1946 | Low | Not Rated |
| Colver Fergus County | 22 | 1939 | Low | Not Rated |
| Collins Detention Reservoir Valley County | 41 | 1957 | Low | Not Rated |
| Collins Valley County | 22 | 1955 | Low | Not Rated |
| Colen Phillips County | 20 | 1945 | Low | Not Rated |
| Coleman #1 Garfield County | 18 | 1960 | Low | Not Rated |
| Coibson #1 Big Horn County | 18 | 1955 | Low | Not Rated |
| Coffee Mate Fergus County | 15 | 1938 | Low | Not Rated |
| Coffee Cake Dam Judith Basin County | 14 | 1930 | Low | Not Rated |
| Coffee #3 Rosebud County | 30 | 1960 | Low | Not Rated |
| Coffee #2 Rosebud County | 25 | 1950 | Low | Not Rated |
| Cockran Grazing #5 Carter County | 25 | 1965 | Low | Not Rated |
| Cockran Grazing #4 Carter County | 15 | 1959 | Low | Not Rated |
| Cockran Grazing #3 Carter County | 25 | 1965 | Low | Not Rated |
| Cockran Grazing #2 Carter County | 20 | 1960 | Low | Not Rated |
| Cockran Grazing #1 Carter County | 25 | 1959 | Low | Not Rated |
| Coal Dam Garfield County | 20 | 1960 | Low | Not Rated |
| Coal Creek Drop Dam Prairie County | 31 | — | Low | Satisfactory |
| Coal Creek Detention Dam Prairie County | 31 | 1963 | Low | Poor |
| Coal Creek Dam #1 Custer County | 19 | 1949 | Low | Not Rated |
| Clover Drop Dam Valley County | 15 | — | Low | Satisfactory |
| Cloudy Day Teton County | 20 | 1953 | Low | Not Rated |
| Cloudy Dam Blaine County | 17 | — | Low | Not Rated |
| Closed Doors Liberty County | 14 | 1962 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.