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 51–75 of 79
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Pear Lake Dam Beaverhead County | 19 | 1904 | High | Poor |
| Petrolia Petroleum County | 76 | 1951 | High | Poor |
| Powell Powell County | 52 | 1981 | High | Poor |
| Praire Goat Dam Dawson County | 35 | — | Low | Poor |
| Ruins Detention Dam Valley County | 35 | 1965 | Low | Poor |
| Sob Detention Dam Valley County | 29 | 1966 | Low | Poor |
| South Fork Detention Dam Prairie County | 28 | 1964 | Low | Poor |
| South Side Detention Dam Carbon County | 47 | — | Low | Poor |
| Sparrow Pond Dam Beaverhead County | 7 | 1965 | Low | Poor |
| Square Butte Detention Dam Phillips County | 42 | 1967 | Low | Poor |
| Storm Lake Dam Deer Lodge County | 29 | 1898 | High | Poor |
| Tabor North Lake County | 42 | 1930 | High | Poor |
| Tarawa Retention Dam Phillips County | 22 | 1947 | Low | Poor |
| Three Mile Reservoir (L.&C.) Lewis and Clark County | 70 | 1926 | High | Poor |
| Triple Crossing Detention Dam Valley County | 34 | 1957 | Low | Poor |
| Twin (Turtle) Lake County | 34 | 1932 | High | Poor |
| Two Forks Detention Dam Valley County | 24 | 1956 | Low | Poor |
| U.L.T. Detention Dam Valley County | 18 | 1966 | Low | Poor |
| Upper Dry Fork East Dike Sanders County | 14 | 1942 | Low | Poor |
| Upper Glasston North Dam Sweet Grass County | 20 | 1912 | High | Poor |
| Upper Glasston West Dam Sweet Grass County | 22 | 1912 | High | Poor |
| Vr-2 Detention Dam Valley County | 27 | 1936 | Low | Poor |
| Vr-77 Retention Dam Valley County | 17 | 2003 | Low | Poor |
| West Fork Bitterroot (Painted Rocks) Ravalli County | 143 | 1940 | High | Poor |
| Whaley #11 Dam Rosebud County | 26 | — | Low | Poor |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.