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 101–113 of 113
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Stillwater Nye Tailings Dam Stillwater County | — | — | High | Satisfactory |
| Sullivan Dam Toole County | 68 | 1967 | High | Satisfactory |
| Swift Dike (Pondera) Pondera County | 53 | 1967 | High | Satisfactory |
| Swift (Pondera) Pondera County | 205 | 1967 | High | Satisfactory |
| Taylor, Upper Powell County | 43 | 1951 | High | Satisfactory |
| Thompson Falls - Intake Dam B Sanders County | 142 | 1996 | Low | Satisfactory |
| Tongue River Dam Big Horn County | 93 | 1939 | High | Satisfactory |
| Upper Baker Dam Fallon County | 32 | 1975 | High | Satisfactory |
| West Dam Deer Lodge County | 100 | — | Significant | Satisfactory |
| Wilson (Judith Basin) Judith Basin County | 29 | 1952 | High | Satisfactory |
| Winkum Dam Valley County | 28 | — | Low | Satisfactory |
| Yankee Doodle Tailings Dam Silver Bow County | 570 | 1972 | High | Satisfactory |
| Yellow Water Dike Petroleum County | 11 | 1938 | High | Satisfactory |
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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.