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 26–44 of 44
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Noxon Rapids Sanders County | 260 | 1960 | High | Fair |
| Pilster Diversion One Dam Carter County | 14 | 1960 | Low | Fair |
| Pr-21 Ret. Dam./Whitewater Lake Phillips County | 12 | 1939 | Low | Fair |
| Sand Creek Du Dam Beaverhead County | 9 | 1999 | Low | Fair |
| Scott Reservoir Lewis and Clark County | 32 | 1952 | High | Fair |
| Scoup Dam Carter County | 15 | 1966 | Low | Fair |
| Script Detention Dam Valley County | 17 | 1957 | Low | Fair |
| Selis Ksanka Qlispe (Skq) Lake County | 200 | 1938 | High | Fair |
| Sentinel Detention Dam Phillips County | 33 | 1969 | Low | Fair |
| Seven-Up Detention Dam Phillips County | 24 | 1967 | Low | Fair |
| Silver Lake West Dam Deer Lodge County | 17 | 1918 | High | Fair |
| South Fork Dry Blood Creek Detention Dam Petroleum County | 36 | 1963 | Low | Fair |
| Sparrow Slough Dam Beaverhead County | 14 | 1985 | Low | Fair |
| Tin Cup Lake (Powell) Powell County | 19 | 1965 | High | Fair |
| Voldseth East Dam Meagher County | 24 | 1939 | High | Fair |
| Voldseth West Dam Meagher County | 32 | 1939 | High | Fair |
| Ward Dam Valley County | 23 | 2003 | Low | Fair |
| Willow Creek Dike 2 Big Horn County | 40 | 1941 | Undetermined | Fair |
| Yellow Water Main Dam Petroleum County | 37 | 1938 | High | Fair |
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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.