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 2976–2990 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Ackley Lake Dam Judith Basin County | 55 | 1938 | High | Satisfactory |
| Aces Wild Carter County | 12 | 1956 | Low | Not Rated |
| Ace of Diamonds Carter County | 20 | 1956 | Low | Not Rated |
| Aberta Garfield County | 20 | 1954 | Low | Not Rated |
| A Anderson Valley County | 15 | 1960 | Low | Not Rated |
| 7-Up Sea Fallon County | 25 | 1949 | Low | Not Rated |
| 7-B Reservoir Garfield County | 36 | 1945 | Low | Not Rated |
| 761 Lang Fallon County | 21 | 1965 | Low | Not Rated |
| 71 Ranch (Bassett) Rosebud County | 21 | 1971 | Low | Not Rated |
| 6m Dam Garfield County | 12 | 1971 | Low | Not Rated |
| #6 Blaine County | 20 | 1938 | Low | Not Rated |
| #5 Dam Big Horn County | 36 | 1980 | Low | Not Rated |
| 26n9e22 Chouteau County | 22 | — | Low | Not Rated |
| 20 Dam Custer County | 29 | 2003 | Low | Poor |
| 1120 Ice Reservoir Dam Park County | 25 | 1898 | Low | Not Available |
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Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.