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 1951–1975 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Doukhobors Judith Basin County | 28 | 1965 | Low | Not Rated |
| Douglas Creek Dam Granite County | 20 | 1968 | Low | Not Rated |
| Douglas Blaine County | 15 | 1950 | Low | Not Rated |
| Dougcliff Reservoir Teton County | 20 | 1950 | Low | Not Rated |
| Double Crossing Detention Dam Valley County | 19 | 1962 | Low | Unsatisfactory |
| Dordrecht Judith Basin County | 28 | 1968 | Low | Not Rated |
| Doran Custer County | 25 | 1936 | Low | Not Rated |
| Donley Reservoir (Rosebud) Rosebud County | 38 | 1930 | Low | Not Rated |
| Doney Lake Dam Powell County | 18 | 1946 | Low | Not Available |
| Dondarlee #1 Prairie County | 21 | 1948 | Low | Not Rated |
| Don #1 Valley County | 8 | 1960 | Low | Not Rated |
| Dolomites Judith Basin County | 20 | 1958 | Low | Not Rated |
| Dolcefarniente Judith Basin County | 20 | 1960 | Low | Not Rated |
| Dolabriform Chouteau County | 25 | 1965 | Low | Not Rated |
| Doig Brothers Meagher County | 30 | 1942 | Low | Not Rated |
| Dogwood Blaine County | 10 | 1940 | Low | Not Rated |
| Dog Star Chouteau County | 25 | 1962 | Low | Not Rated |
| Doesitall Liberty County | 25 | 1950 | Low | Not Rated |
| Dodson Diversion Dam Phillips County | 26 | 1910 | Low | Not Available |
| Dodecanese Chouteau County | 10 | 1967 | Low | Not Rated |
| Dnestr Chouteau County | 25 | 1950 | Low | Not Rated |
| Djokjakarta Chouteau County | 15 | 1960 | Low | Not Rated |
| D Johnson #2 Fallon County | 20 | 1935 | Low | Not Rated |
| Dividend Valley County | 18 | 1964 | Low | Not Rated |
| Dishwater Blaine 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.