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 1151–1175 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Halfpint Detention Dam Valley County | 32 | 1965 | Low | Poor |
| Halfway Big Horn County | 18 | 1956 | Low | Not Rated |
| Hall (Custer) Custer County | 18 | 1936 | Low | Not Rated |
| Halmans #1 Fallon County | 20 | 1954 | Low | Not Rated |
| Halmans #2 Fallon County | 21 | 1954 | Low | Not Rated |
| Halmans #3 Fallon County | 20 | 1954 | Low | Not Rated |
| Halverson Valley County | 27 | 1954 | Significant | Not Rated |
| Halverson #1 Yellowstone County | 30 | 1960 | Low | Not Rated |
| Halverson Ranch Chouteau County | 30 | 1967 | Low | Not Rated |
| Halverson Ranch INCorporated #1 Chouteau County | 11 | 1948 | Low | Not Rated |
| Halvor #1 Phillips County | 14 | 1917 | Low | Not Rated |
| Halvor #2 Phillips County | 20 | 1925 | Low | Not Rated |
| Hamen Reservoir Meagher County | 22 | 1945 | Low | Not Rated |
| Hamlick Reservoir Custer County | 24 | 1959 | Low | Not Rated |
| Hammer #1 Golden Valley County | 20 | 1973 | Low | Not Rated |
| Hamms Detention Dam Valley County | 19 | 1957 | Low | Unsatisfactory |
| Hamster Wibaux County | 23 | 1950 | Low | Not Rated |
| Hand #3 Phillips County | 19 | 1954 | Low | Not Rated |
| Hanford Chouteau County | 30 | 1962 | Low | Not Rated |
| Hankins #1 Chouteau County | 40 | 1950 | Low | Not Rated |
| Hanley Carter County | 15 | 1936 | Low | Not Rated |
| Hannaland #1 McCone County | 25 | 1944 | Low | Not Rated |
| Hannaland Reservoir McCone County | 20 | 1959 | Low | Not Rated |
| Hansen Roosevelt County | 15 | 1940 | Low | Not Rated |
| Hansen (Blaine) Blaine County | 10 | 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.