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 2376–2400 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Triple Crossing Valley County | 35 | 1961 | Low | Not Rated |
| Triple Crossing Detention Dam Valley County | 34 | 1957 | Low | Poor |
| Triple L and Er Fritz Liberty County | 15 | 1950 | Low | Not Rated |
| Triple L Reservoir Chouteau County | 25 | 1950 | Low | Not Rated |
| Tri-W-Inc #2 Richland County | 14 | 1961 | Low | Not Rated |
| Trout Rosebud County | 32 | 1957 | Low | Not Rated |
| Trudell #1 Richland County | 10 | 1955 | Low | Not Rated |
| Tryannosaurus Chouteau County | 20 | 1953 | Low | Not Rated |
| Tsadi Glacier County | 15 | 1930 | Low | Not Rated |
| T&S Stock CO #4 McCone County | 12 | 1945 | Low | Not Rated |
| Tuff Retention Dam Valley County | 19 | 1975 | Low | Not Rated |
| Tulkarm Blaine County | 30 | 1937 | Low | Not Rated |
| Turk Chouteau County | 25 | 1960 | Low | Not Rated |
| Turkey Track Phillips County | 15 | 1953 | Low | Not Rated |
| Turnbull #1 Powder River County | 22 | 1954 | Low | Not Rated |
| Turner Liberty County | 15 | 1935 | Low | Not Rated |
| Tusler Creek Oyargers & Pardies McCone County | 15 | 1936 | Low | Not Rated |
| Tutsch Reservoir Fergus County | 30 | 1939 | Low | Not Rated |
| Tuttle Phillips County | 8 | 1958 | Low | Not Rated |
| Twelvemile Coulee Chouteau County | 20 | 1969 | Low | Not Rated |
| Twin Dam #1 Rosebud County | 15 | 1959 | Low | Not Rated |
| Twin Dam #2 Rosebud County | 15 | 1959 | Low | Not Rated |
| Twin Forks (Dawson) Dawson County | 35 | 1961 | Low | Not Rated |
| Twin Lakes Teton County | 15 | 1952 | Low | Not Rated |
| Twitchell #1 Garfield County | 24 | 1960 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.