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 2526–2550 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| A S Welch #1 Rosebud County | 12 | 1950 | Low | Not Rated |
| Aster Toole County | 7 | 1920 | Low | Not Rated |
| Askin Fallon County | 30 | 1960 | Low | Not Rated |
| Ashley Flathead County | 10 | 1928 | Low | Not Rated |
| Ashenhurst #2 Rosebud County | 12 | 1948 | Low | Not Rated |
| Ashenhurst #1 Rosebud County | 12 | 1930 | Low | Not Rated |
| Ash Creek Prairie County | 29 | 1951 | Low | Not Rated |
| Artz #1 Garfield County | 12 | 1950 | Low | Not Rated |
| Artic Chouteau County | 25 | 1950 | Low | Not Rated |
| Arthur #1 Dawson County | 20 | 1952 | Low | Not Rated |
| Arthur Richland County | 20 | 1930 | Low | Not Rated |
| Arrambide Detention Dam X Valley County | 17 | 1957 | Low | Fair |
| Armells Reservoir Fergus County | 38 | 1951 | Low | Not Rated |
| Aries Judith Basin County | 15 | 1960 | Low | Not Rated |
| Archie #1 Garfield County | 20 | 1959 | Low | Not Rated |
| Archer #2 Fergus County | 33 | 1964 | Low | Not Rated |
| Arbuckle #2 Carter County | 12 | 1909 | Low | Not Rated |
| Arbuckle #1 Carter County | 12 | 1940 | Low | Not Rated |
| Apogee Hill County | 30 | 1965 | Low | Not Rated |
| Apocolipse Pondera County | 10 | 1930 | Low | Not Rated |
| A Peterson Richland County | 10 | 1951 | Low | Not Rated |
| Apache Dam Carter County | 22 | — | Low | Satisfactory |
| Antelope Dam Garfield County | 18 | 1950 | Low | Not Rated |
| Antelope Creek Reservoir McCone County | 22 | 1944 | Low | Not Rated |
| Antares Judith Basin County | 30 | 1954 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.