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 451–475 of 2,606
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Sidney Sewage Lagoon Richland County | 9 | 1960 | Low | Not Rated |
| Sidney Dam Carter County | 32 | — | Low | Not Rated |
| Sibra Chouteau County | 17 | 1960 | Low | Not Rated |
| Shupak #1 Carbon County | 18 | 1963 | Low | Not Rated |
| Shumaker #1 Prairie County | 18 | 1965 | Low | Not Rated |
| Shoup Lake Powell County | 18 | 1925 | Low | Not Rated |
| Shipley'S (Custer) Custer County | 27 | 1965 | Low | Not Rated |
| Shipley Reservoir (Powder R.) Powder River County | 23 | 1961 | Low | Not Rated |
| Shining Mountain Ravalli County | 45 | 1972 | Low | Not Rated |
| Shields Fields Roosevelt County | 30 | 1960 | Low | Not Rated |
| Shendell #2 Meagher County | 30 | 1949 | Low | Not Rated |
| Shelly'S Hope Lincoln County | 8 | 1950 | Low | Not Rated |
| Shelby Sewage Lagoon Toole County | 10 | 1960 | Low | Not Rated |
| Sheffels Reservoir Cascade County | 68 | 1963 | Low | Not Rated |
| Shefelbine McCone County | 20 | 1965 | Low | Not Rated |
| Sheepshed Detention Dam Valley County | 27 | 1954 | Low | Unsatisfactory |
| Sheepland Musselshell County | 15 | 1946 | Low | Not Rated |
| Sheep Buyer Chouteau County | 25 | 1905 | Low | Not Rated |
| Shawver #1 Garfield County | 25 | 1940 | Low | Not Rated |
| Shaw Reservoir (Garfield) Garfield County | 20 | 1948 | Low | Not Rated |
| Shaw #3 Garfield County | 30 | 1947 | Low | Not Rated |
| Shaw #1 Garfield County | 35 | 1973 | Low | Not Rated |
| Sharkey #1 Petroleum County | 25 | 1965 | Low | Not Rated |
| Shand #1 Rosebud County | 15 | 1948 | Low | Not Rated |
| Shale Creek Petroleum County | 29 | 1957 | Low | Not Rated |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.