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 2,990
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Zinger #1 Richland County | 16 | 1960 | Low | Not Rated |
| Zimmerman Retention Dam #1 Petroleum County | 19 | 2003 | Low | Not Rated |
| Zempel #3 Rosebud County | 20 | 1940 | Low | Not Rated |
| Zempel Rosebud County | 22 | 1936 | Low | Not Rated |
| Zelzo Carter County | 15 | 1920 | Low | Not Rated |
| Z Cake Rosebud County | 15 | 1950 | Low | Not Rated |
| Zanzi Pal Hill County | 25 | 1930 | Low | Not Rated |
| Yunck Glacier County | 20 | 1950 | Low | Not Rated |
| Yuletide Blaine County | 20 | 1930 | Low | Not Rated |
| Young Sun Teton County | 15 | 1970 | Low | Not Rated |
| Young Clemons Teton County | 18 | 1950 | Low | Not Rated |
| Young #1 Custer County | 26 | 1952 | Low | Not Rated |
| Yellow Water Main Dam Petroleum County | 37 | 1938 | High | Fair |
| Yellow Water Dike Petroleum County | 11 | 1938 | High | Satisfactory |
| Yellowtail Afterbay Dam Big Horn County | 72 | 1966 | High | Not Available |
| Yellow Sarpy Treasure County | 25 | 1965 | Low | Not Rated |
| Yellow Minni Stone Treasure County | 20 | 1965 | Low | Not Rated |
| Yellow Haired Custer Yellowstone County | 15 | 1967 | Low | Not Rated |
| Yastremski Dam Park County | 10 | 1950 | Low | Not Rated |
| Yantighem Chouteau County | 14 | 1961 | Low | Not Rated |
| Yankee Doodle Tailings Dam Silver Bow County | 570 | 1972 | High | Satisfactory |
| Wyrick Fallon County | 22 | 1984 | Low | Not Rated |
| Wyotana Ranch #5 Carter County | 15 | 1962 | Low | Not Rated |
| Wyotana Ranch #4 Carter County | 18 | 1962 | Low | Not Rated |
| Wyant Lake Ravalli County | 18 | 1909 | Low | 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.