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 2276–2300 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Swart #3 Rosebud County | 15 | 1942 | Low | Not Rated |
| Swart #5 Rosebud County | 18 | 1946 | Low | Not Rated |
| Swart #7 Rosebud County | 25 | 1943 | Low | Not Rated |
| Swart #8 Rosebud County | 30 | 1948 | Low | Not Rated |
| Swart #9 Rosebud County | 25 | 1956 | Low | Not Rated |
| Swartz Lake Dam Lake County | 10 | 1960 | Low | Not Rated |
| Swayne #1 Garfield County | 18 | 1965 | Low | Not Rated |
| Sweet Adeline Hill County | 30 | 1940 | Low | Not Rated |
| Sweet Pea Chouteau County | 20 | 1940 | Low | Not Rated |
| Sweo Valley County | 19 | 1945 | Low | Not Rated |
| Swift (Prairie) Prairie County | 40 | 1965 | Low | Not Rated |
| Tacky Chouteau County | 25 | 1920 | Low | Not Rated |
| Tarawa Retention Dam Phillips County | 22 | 1947 | Low | Poor |
| Target Detention Dam Valley County | 18 | 1964 | Low | Unsatisfactory |
| Tarum Valley County | 15 | 1960 | Low | Not Rated |
| Tarzan Blaine County | 38 | 1973 | Low | Not Rated |
| Tauck #3 Carter County | 14 | 1955 | Low | Not Rated |
| Taylor #2 Garfield County | 45 | 1979 | Low | Not Rated |
| Taylor Fish (Fergus) Fergus County | 22 | 1951 | Low | Not Rated |
| Taylor (Garfield) Garfield County | 19 | 1968 | Low | Not Rated |
| Taylor Reservoir (Fergus) Fergus County | 27 | 1951 | Low | Not Rated |
| T-Bar Phillips County | 10 | 1955 | Low | Not Rated |
| T-Diamond #1 Custer County | 22 | 1961 | Low | Not Rated |
| Tedson Reservoir Pondera County | 10 | 1958 | Low | Not Rated |
| Teds Reservoir McCone County | 15 | 1949 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.