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 1901–1925 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Easy Retention Dam Musselshell County | 34 | 1972 | Low | Not Rated |
| East Fork Reservoir Rosebud County | 11 | 1945 | Low | Not Rated |
| East Axolotl Lake Madison County | 10 | 1945 | Low | Not Rated |
| Early Bird Phillips County | 10 | 1960 | Low | Not Rated |
| Earl Krietel #4 Carter County | 30 | 1956 | Low | Not Rated |
| Earl Krietel #3 Carter County | 12 | 1959 | Low | Not Rated |
| Eagle Land #1 Big Horn County | 30 | 1940 | Low | Not Rated |
| Eagle Eyes Chouteau County | 24 | 1946 | Low | Not Rated |
| Dyncan #2 Valley County | 25 | 1964 | Low | Not Rated |
| Dye #2 Carter County | 20 | 1959 | Low | Not Rated |
| Dyan Chouteau County | 20 | 1948 | Low | Not Rated |
| Dwarf Dawson County | 15 | 1961 | Low | Not Rated |
| Dutch Fergus County | 20 | 1964 | Low | Not Rated |
| Durham Madison County | 10 | 1955 | Low | Not Rated |
| Durfee Creek Dam Fergus County | 30 | — | Low | Not Rated |
| Dunning #2 Rosebud County | 20 | 1961 | Low | Not Rated |
| Dunning #1 Rosebud County | 25 | 1961 | Low | Not Rated |
| Dunlap Richland County | 20 | 1960 | Low | Not Rated |
| Dugout #1 Garfield County | 18 | 1955 | Low | Not Rated |
| Duck/Sugrast Dam Prairie County | 20 | — | Low | Not Rated |
| Duck Fields Broadwater County | 20 | 1960 | Low | Not Rated |
| Dubbe Reservoir Valley County | 19 | 1937 | Low | Not Rated |
| D S Scott #3 Big Horn County | 20 | 1965 | Low | Not Rated |
| D S Scott #2 Big Horn County | 15 | 1930 | Low | Not Rated |
| Ds Scott #1 Big Horn County | 13 | 1935 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.