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 1–25 of 193
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Aldebaran Pondera County | 35 | 1920 | Significant | Not Rated |
| Algol Toole County | 20 | 1959 | Significant | Not Rated |
| Allie Valley County | 30 | 1960 | Significant | Not Rated |
| Anchor Lake North Dam Beaverhead County | 12 | 1904 | Significant | Not Rated |
| Angie McCone County | 25 | 1943 | Significant | Not Rated |
| Arther Dengel #1 Fergus County | 24 | 1948 | Significant | Not Rated |
| Arthun Dam Park County | 23 | 1956 | Significant | Not Rated |
| Balder Reservoir McCone County | 28 | 1962 | Significant | Not Rated |
| Barley Reservoir Rosebud County | 24 | 1958 | Significant | Not Rated |
| Basin Creek Dam #2 Silver Bow County | 49 | 1907 | Significant | Poor |
| Big Creek Lake Ravalli County | 12 | 1892 | Significant | Not Rated |
| Big Elk Wheatland County | 21 | 1927 | Significant | Not Rated |
| Big Lake Missoula County | 30 | 1915 | Significant | Not Rated |
| Big Sky Lake Dam (Missoula) Missoula County | 7 | — | Significant | Not Rated |
| Big Timber #47 Rosebud County | 18 | 1955 | Significant | Not Rated |
| Binion #3 Garfield County | 23 | 1945 | Significant | Not Rated |
| Blevins Blaine County | 26 | 1952 | Significant | Not Rated |
| Bonanza Meagher County | 44 | 1938 | Significant | Not Rated |
| Brown (Liberty) Liberty County | 20 | 1939 | Significant | Not Rated |
| Bryan Dam Blaine County | 25 | 1980 | Significant | Not Rated |
| Buffalo Hill Garfield County | 20 | 1936 | Significant | Not Rated |
| Burke Richland County | 15 | 1948 | Significant | Not Rated |
| Carter Pond, Lower (Fergus) Fergus County | 21 | 1938 | Significant | Not Rated |
| Carter Pond, Upper (Fergus) Fergus County | 21 | 1951 | Significant | Not Rated |
| Cool Cotton Hill County | 20 | 1938 | Significant | Not Rated |
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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.