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 2351–2375 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Tomsheck Toole County | 36 | 1954 | Low | Not Rated |
| Tonn #2 Custer County | 15 | 1960 | Low | Not Rated |
| Tonn #3 Custer County | 18 | 1958 | Low | Not Rated |
| Tonn #4 Custer County | 20 | 1950 | Low | Not Rated |
| Too Far Gone Fergus County | 15 | 1955 | Low | Not Rated |
| Toprail Dam Valley County | 20 | — | Low | Unsatisfactory |
| Tortilla Chouteau County | 12 | 1920 | Low | Not Rated |
| Towe Farms INC #1 McCone County | 16 | 1969 | Low | Not Rated |
| Towe Farms INC #2 McCone County | 16 | 1967 | Low | Not Rated |
| Towe Farms INC #3 McCone County | 15 | 1945 | Low | Not Rated |
| Towe Farms INC #4 McCone County | 20 | 1970 | Low | Not Rated |
| Townhouse Dawson County | 10 | 1955 | Low | Not Rated |
| Townsend Sewage Lagoon Broadwater County | 9 | 1962 | Low | Not Rated |
| Tow, Wilfred Hill County | 20 | 1952 | Low | Not Available |
| Toy Box Chouteau County | 30 | 1973 | Low | Not Rated |
| Trail Creek Retention Dam Rosebud County | 15 | 2003 | Low | Not Rated |
| Transistor #1 Blaine County | 15 | 1950 | Low | Not Rated |
| Transistor #2 Blaine County | 15 | 1950 | Low | Not Rated |
| Traub #1 Powder River County | 30 | 1956 | Low | Not Rated |
| Traub #2 Powder River County | 24 | 1952 | Low | Not Rated |
| Traub#3 Powder River County | 25 | 1967 | Low | Not Rated |
| Traweek #2 Fallon County | 30 | 1958 | Low | Not Rated |
| Tree Bark #1 Phillips County | 20 | 1947 | Low | Not Rated |
| Tree Bark #2 Phillips County | 25 | 1957 | Low | Not Rated |
| Tree Coulee Dam Garfield County | 18 | 1950 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.