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 188
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| 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 |
| Yankee Doodle Tailings Dam Silver Bow County | 570 | 1972 | High | Satisfactory |
| Wilson (Judith Basin) Judith Basin County | 29 | 1952 | High | Satisfactory |
| Willow Creek Dam Madison County | 105 | 1938 | High | Poor |
| Willow Creek BOR MT-Dike 5 Lewis and Clark County | 23 | 1940 | High | Not Available |
| Whitetail Dam Jefferson County | 28 | 1922 | High | Not Rated |
| West Fork Bitterroot (Painted Rocks) Ravalli County | 143 | 1940 | High | Poor |
| Weigand Reservoir East Phillips County | 21 | — | High | Not Rated |
| Weigand Reservoir Blaine County | 13 | — | High | Not Rated |
| Voldseth West Dam Meagher County | 32 | 1939 | High | Fair |
| Voldseth East Dam Meagher County | 24 | 1939 | High | Fair |
| Upper Glasston West Dam Sweet Grass County | 22 | 1912 | High | Poor |
| Upper Glasston North Dam Sweet Grass County | 20 | 1912 | High | Poor |
| Upper Baker Dam Fallon County | 32 | 1975 | High | Satisfactory |
| Twin (Turtle) Lake County | 34 | 1932 | High | Poor |
| Twin Bridges Wastewater Lagoon Dam Madison County | 13 | — | High | Not Rated |
| Tongue River Dam Big Horn County | 93 | 1939 | High | Satisfactory |
| Tin Cup Lake (Powell) Powell County | 19 | 1965 | High | Fair |
| Tiber Dam Liberty County | 211 | 1956 | High | Not Available |
| Three Mile Reservoir (L.&C.) Lewis and Clark County | 70 | 1926 | High | Poor |
| Taylor, Upper Powell County | 43 | 1951 | High | Satisfactory |
| Tabor North Lake County | 42 | 1930 | High | Poor |
| Swift (Pondera) Pondera County | 205 | 1967 | High | Satisfactory |
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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.