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 101–125 of 188
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Lake Creek Lincoln County | 44 | 1917 | High | Satisfactory |
| Lake Frances East Dam Pondera County | 59 | 1909 | High | Satisfactory |
| Lake Frances North Dam Pondera County | 22 | 1909 | High | Satisfactory |
| Lake Sherburne Dam Glacier County | 109 | 1919 | High | Not Available |
| Lakeside Yellowstone County | 22 | — | High | Satisfactory |
| Lebo #3,East Dam Wheatland County | 27 | 1973 | High | Satisfactory |
| Libby Dam Lincoln County | 422 | 1973 | High | Not Available |
| Lima Beaverhead County | 56 | 1934 | High | Satisfactory |
| Lion Lake Dam Flathead County | 22 | 1948 | High | Not Rated |
| Little Bitterroot Flathead County | 17 | 1917 | High | Not Available |
| Little Sleeping Child Creek Dam Ravalli County | 35 | 1927 | High | Satisfactory |
| Lower Baker Dam Fallon County | 23 | 1908 | High | Satisfactory |
| Lower Dry Fork Sanders County | 37 | 1921 | High | Fair |
| Lower Glasston Dam Sweet Grass County | 30 | 1912 | High | Poor |
| Lower Two Medicine Glacier County | 70 | 1967 | High | Satisfactory |
| Lower Willow Creek Dam Granite County | 96 | 1962 | High | Poor |
| Madison Dam Madison County | 39 | 1907 | High | Satisfactory |
| Martinsdale, East Dam Wheatland County | 49 | 1939 | High | Poor |
| Martinsdale, North Dam Wheatland County | 91 | 1939 | High | Satisfactory |
| Mcdonald Lake County | 47 | 1920 | High | Satisfactory |
| Mckay Creek Powell County | 33 | 1955 | High | Fair |
| Melstone Detention Dam Musselshell County | 19 | 2003 | High | Unsatisfactory |
| Mill Lake Ravalli County | 25 | 1895 | High | Not Rated |
| Mission Lake County | 98 | 1935 | High | Fair |
| Morony Cascade County | 107 | 1929 | High | Satisfactory |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.