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 2851–2875 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Watt Garfield County | 20 | 1966 | Low | Not Rated |
| Watt #2 Garfield County | 20 | 1960 | Low | Not Rated |
| Watters #1 Powder River County | 29 | 1966 | Significant | Not Rated |
| Watts #1 Custer County | 28 | 1912 | Low | Not Rated |
| Waukena Lake Dam Beaverhead County | 12 | 1930 | Low | Not Available |
| Wayne #2 McCone County | 14 | 1955 | Low | Not Rated |
| W B Black Phillips County | 10 | 1930 | Low | Not Rated |
| Wb Goffena #1 Musselshell County | 25 | 1955 | Low | Not Rated |
| W C Eustance #1 Cascade County | 14 | 1945 | Low | Not Rated |
| Weaver Dam Fergus County | 25 | 1966 | Low | Not Rated |
| Webb #1 Cascade County | 15 | 1962 | Low | Not Rated |
| Weeding #1 Garfield County | 18 | 1950 | Low | Not Rated |
| Weeding #2 Garfield County | 14 | 1965 | Low | Not Rated |
| Weeding #3 Garfield County | 16 | 1962 | Low | Not Rated |
| Weigand Reservoir Blaine County | 13 | — | High | Not Rated |
| Weigand Reservoir East Phillips County | 21 | — | High | Not Rated |
| Weingart Land & Livestock #1 Petroleum County | 25 | 1959 | Low | Not Rated |
| Wendall Willkie Judith Basin County | 15 | 1965 | Significant | Not Rated |
| Wendell #1 McCone County | 34 | 1950 | Low | Not Rated |
| Weppler #1 Stillwater County | 35 | 1950 | Low | Not Rated |
| Weppler #2 Stillwater County | 26 | 1957 | Low | Not Rated |
| W E Scott #1 Custer County | 18 | 1939 | Low | Not Rated |
| Wesley #1 Prairie County | 25 | 1957 | Low | Not Rated |
| Wesley #2 Prairie County | 25 | 1890 | Low | Not Rated |
| Weson Valley County | 22 | 1951 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.