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 1776–1800 of 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Mathew James #1 Powder River County | 26 | 1949 | Low | Not Rated |
| Mathilda #1 McCone County | 15 | 1950 | Significant | Not Rated |
| Matovich #1 Garfield County | 15 | 1947 | Low | Not Rated |
| Matovich One Phillips County | 12 | 1960 | Low | Not Rated |
| Mattingly Roosevelt County | 17 | 1949 | Low | Not Rated |
| Maughan Dam Lake County | 35 | 1960 | Low | Not Rated |
| Mauland Dam Fergus County | 34 | 1946 | Low | Not Rated |
| Mayns Dam Meagher County | 14 | 1940 | Low | Not Rated |
| Mccarter North Dam Toole County | 38 | 1953 | Significant | Not Rated |
| Mccarter West Dam Toole County | 28 | 1953 | Significant | Not Rated |
| Mccloy, R. McCone County | 20 | 1943 | Low | Not Rated |
| Mcclure Detention Dam Prairie County | 15 | 2003 | Low | Fair |
| Mcconnell Blaine County | 25 | 1983 | Low | Not Rated |
| Mccoys Daniels County | 30 | 1966 | Low | Not Rated |
| Mccracken Brothers Toole County | 50 | 1953 | Low | Not Rated |
| Mccracken, Tom Pondera County | 25 | 1950 | Low | Not Rated |
| Mccuin Valley County | 10 | 1930 | Low | Not Rated |
| Mcdonald Lake County | 47 | 1920 | High | Satisfactory |
| Mcfarland-White Wheatland County | 35 | 1968 | Significant | Not Rated |
| Mcferran #1 Big Horn County | 25 | 1928 | Low | Not Rated |
| Mcferran #2 Big Horn County | 17 | 1928 | Low | Not Rated |
| Mcferran #3 Big Horn County | 25 | 1928 | Low | 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 |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.