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 651–675 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Damschen #2 Petroleum County | 25 | 1960 | Low | Not Rated |
| Dana-Cameron Ranch Cascade County | 20 | 1940 | Low | Not Rated |
| Danelson Reservoir Daniels County | 22 | 1968 | Low | Not Rated |
| Danial Downs #2 Dawson County | 14 | 1940 | Low | Not Rated |
| Danial Downs #4 Dawson County | 18 | 1940 | Low | Not Rated |
| Daniel #1 Hill County | 20 | 1960 | Low | Not Rated |
| Daniel #2 Hill County | 20 | 1954 | Low | Not Rated |
| Daniel #3 Hill County | 30 | 1976 | Low | Not Rated |
| Dato Pondera County | 15 | 1960 | Low | Not Rated |
| David Drum #1 Phillips County | 12 | 1950 | Low | Not Rated |
| David Drum #2 Phillips County | 12 | 1950 | Low | Not Rated |
| David Drum #3 Phillips County | 15 | 1950 | Low | Not Rated |
| David Drum #4 Phillips County | 12 | 1950 | Low | Not Rated |
| Davis Creek Dam Powell County | 38 | 1960 | Significant | Not Rated |
| Davis (Richland) Richland County | 25 | 1939 | Low | Not Rated |
| Dawson Ranch #1 Cascade County | 30 | 1948 | Low | Not Rated |
| D Drum Phillips County | 12 | 1960 | Low | Not Rated |
| Dead Horse Detention Dam Valley County | 16 | 1960 | Low | Satisfactory |
| Deadmans Basin Dam Wheatland County | 60 | 1941 | High | Satisfactory |
| Deadmans Basin Dike Wheatland County | 23 | 1941 | High | Satisfactory |
| Deadmans Basin Water Supply Canal Storage Reservoir #2 Wheatland County | 33 | — | Low | Not Rated |
| Deadmans Basin Water Supply Canal Storage Reservoir #5 Wheatland County | 30 | — | Significant | Not Rated |
| Deadmans Basin Water Supply Canal Storage Reservoir #6 Wheatland County | 28 | — | Low | Not Rated |
| Dealers Choice McCone County | 20 | 1944 | Low | Not Rated |
| Dean S #1 McCone County | 20 | 1943 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.