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 201–225 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Bethel #7 Petroleum County | 18 | 1955 | Low | Not Rated |
| Bethel College #3 Rosebud County | 8 | 1960 | Low | Not Rated |
| B G Olson #1 Rosebud County | 22 | 1976 | Low | Not Rated |
| B G Olson #2 Rosebud County | 20 | 1915 | Low | Not Rated |
| B Henderson Richland County | 10 | 1945 | Low | Not Rated |
| Big Bucks #10 Garfield County | 22 | 1955 | Low | Not Rated |
| Big Bucks #11 Garfield County | 22 | 1960 | Low | Not Rated |
| Big Bucks #13 Garfield County | 22 | 1960 | Low | Not Rated |
| Big Bucks #14 Garfield County | 20 | 1955 | Low | Not Rated |
| Big Bucks #15 Garfield County | 20 | 1950 | Low | Not Rated |
| Big Bucks #16 Garfield County | 25 | 1950 | Low | Not Rated |
| Big Bucks #5 Garfield County | 22 | 1955 | Low | Not Rated |
| Big Bucks #7 Garfield County | 24 | 1955 | Low | Not Rated |
| Big Bucks #8 Garfield County | 22 | 1955 | Low | Not Rated |
| Big Bucks #9 Garfield County | 24 | 1955 | Low | Not Rated |
| Big Casino Creek Dam Fergus County | 80 | 1976 | High | Satisfactory |
| Big Creek Lake Ravalli County | 12 | 1892 | Significant | Not Rated |
| Big Deal Valley County | 25 | 1952 | Low | Not Rated |
| Big Dumb Bunny Cascade County | 16 | 1972 | Low | Not Rated |
| Big Elk Wheatland County | 21 | 1927 | Significant | Not Rated |
| Bigfork Diversion Dam Flathead County | 22 | 1910 | High | Poor |
| Biggerstuf Powder River County | 13 | 1960 | Low | Not Rated |
| Big Gravel Dam 1 Hill County | 20 | 1952 | Low | Not Available |
| Big John M Fergus County | 52 | 1972 | Low | Not Rated |
| Big Jugs Hill County | 20 | 1960 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.