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 193
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Manual Oakley Group Dam Teton County | 20 | 1963 | Significant | Not Rated |
| Mathilda #1 McCone County | 15 | 1950 | Significant | Not Rated |
| Mccarter North Dam Toole County | 38 | 1953 | Significant | Not Rated |
| Mccarter West Dam Toole County | 28 | 1953 | Significant | Not Rated |
| Mcfarland-White Wheatland County | 35 | 1968 | Significant | Not Rated |
| Mcgilla Gorilla #50 Lincoln County | 20 | 1970 | Significant | Not Rated |
| Mcglynn Reservoir Richland County | 26 | 1939 | Significant | Not Rated |
| Mcintyre Reservoir Toole County | 30 | 1930 | Significant | Not Rated |
| Mckeever, Frank #2 Garfield County | 25 | 1956 | Significant | Not Rated |
| Mckinley Lake Missoula County | 7 | 1923 | Significant | Not Rated |
| Middle Creek Lake (Cascade) Cascade County | 30 | 1950 | Significant | Not Rated |
| Miller (Blaine) Blaine County | 16 | 1939 | Significant | Not Rated |
| Miller Dam Lincoln County | 9 | 1980 | Significant | Not Rated |
| Mincoff #2 Garfield County | 20 | 1950 | Significant | Not Rated |
| Murnions (Jim) Garfield County | 20 | 1938 | Significant | Not Rated |
| Mussigbrod Lake Dam Beaverhead County | 15 | 1969 | Significant | Not Rated |
| Nelson #1 McCone County | 20 | 1960 | Significant | Not Rated |
| Noble (Custer) Custer County | 25 | 1936 | Significant | Not Rated |
| No. Decker Flood Control Reservoir No. 2 Big Horn County | 52 | — | Significant | Fair |
| Norwegian Creek Dam Madison County | 85 | 1958 | Significant | Not Rated |
| O'Halloran Park County | 23 | 1960 | Significant | Not Rated |
| Olie Toole County | 35 | 1956 | Significant | Not Rated |
| Olson (Richland) Richland County | 30 | 1958 | Significant | Not Rated |
| Panasuk Dam Roosevelt County | 57 | — | Significant | Not Rated |
| Pawlowski #1 McCone County | 20 | 1944 | Significant | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.