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 151–175 of 188
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Scott Coulee Dam Hill County | 58 | 1955 | High | Satisfactory |
| Scott Reservoir Lewis and Clark County | 32 | 1952 | High | Fair |
| Selis Ksanka Qlispe (Skq) Lake County | 200 | 1938 | High | Fair |
| Silver Lake West Dam Deer Lodge County | 17 | 1918 | High | Fair |
| Smith Lake Dam Flathead County | 12 | 1938 | High | Satisfactory |
| South Meadow Creek Dam Madison County | 22 | 1968 | High | Not Available |
| Spartan/Playfair Park Retention Basins Missoula County | 8 | 2003 | High | Satisfactory |
| Stillwater Hertzler Tailings Dam Stillwater County | — | — | High | Satisfactory |
| Stillwater Nye Tailings Dam Stillwater County | — | — | High | Satisfactory |
| Storm Lake Dam Deer Lodge County | 29 | 1898 | High | Poor |
| Sullivan Dam Toole County | 68 | 1967 | High | Satisfactory |
| Sun River Diversion Dam Teton County | 132 | 1915 | High | Not Available |
| Swift Dike (Pondera) Pondera County | 53 | 1967 | High | Satisfactory |
| Swift (Pondera) Pondera County | 205 | 1967 | High | Satisfactory |
| Tabor North Lake County | 42 | 1930 | High | Poor |
| Taylor, Upper Powell County | 43 | 1951 | High | Satisfactory |
| Three Mile Reservoir (L.&C.) Lewis and Clark County | 70 | 1926 | High | Poor |
| Tiber Dam Liberty County | 211 | 1956 | High | Not Available |
| Tin Cup Lake (Powell) Powell County | 19 | 1965 | High | Fair |
| Tongue River Dam Big Horn County | 93 | 1939 | High | Satisfactory |
| Twin Bridges Wastewater Lagoon Dam Madison County | 13 | — | High | Not Rated |
| Twin (Turtle) Lake County | 34 | 1932 | High | Poor |
| Upper Baker Dam Fallon County | 32 | 1975 | High | Satisfactory |
| Upper Glasston North Dam Sweet Grass County | 20 | 1912 | High | Poor |
| Upper Glasston West Dam Sweet Grass County | 22 | 1912 | High | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.