33Total Dams
20High Hazard
2Significant
Dam Safety in Okanogan County, Washington
Okanogan County has 33 dams tracked in the National Inventory of Dams. Of these, 20 are classified as high hazard — meaning failure would probably cause loss of human life. Another 2 carry a significant hazard classification. Currently, 3 dams have a condition assessment of poor or unsatisfactory.
The average dam in Okanogan County is 88 years old. The most common purpose is irrigation. The tallest dam is Grand Coulee Dam at 550 ft.
Explore more: Oldest dams in Washington · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Grand Coulee Dam | High | Not assessed | 550 | Flood Risk Reduction | 1941 |
| Conconully Dam | High | Not assessed | 72 | Irrigation | 1911 |
| Fanchers Dam | High | Fair | 68 | Irrigation | 1926 |
| Leader Lake Dam | High | Satisfactory | 61 | Irrigation | 1910 |
| Salmon Lake Dam | High | Not assessed | 54 | Irrigation | 1921 |
| Patterson Lake Dam | High | Fair | 32 | Irrigation | 1924 |
| Stout Reservoir Dam | High | Satisfactory | 29 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Sinlahekin Dam No 3 | High | Satisfactory | 24 | Recreation | 1950 |
| Schweitzer Dam and Reservoir | High | Poor | 18 | Irrigation | 1914 |
| Sinlahekin Dam No 2 | High | Fair | 18 | Recreation | 1949 |
| Moccasin Lake Dam | High | Fair | 17 | Irrigation | 1969 |
| Leader Lake Saddle Dam | High | Satisfactory | 16 | Irrigation | 1910 |
| Zosel Dam | High | Satisfactory | 16 | Irrigation | 1986 |
| Hawkins Dam | High | Fair | 16 | Irrigation | 1940 |
| Chalfa Dam | High | Satisfactory | 15 | Irrigation | 1940 |
| Rabel Dam | High | Poor | 15 | Recreation | 1940 |
| Sinlahekin Dam No 1 | High | Satisfactory | 14 | Recreation | 1949 |
| Owhi | High | Unsatisfactory | 12 | Irrigation | 1915 |
| Little Green Lake Dam | High | Fair | 11 | Fish and Wildlife Pond | 1959 |
| Milles Lake Dam | High | Satisfactory | 6 | Fish and Wildlife Pond | 1950 |
| Enloe Dam | Significant | Fair | 63 | Recreation | 1920 |
| Beth Lake | Significant | Not assessed | 16 | Recreation | |
| Horse Spring Coulee Dam | Low | Not assessed | 67 | Irrigation | 1924 |
| Blue Lake Dam Okanogan Co | Low | Not assessed | 32 | Recreation | 1923 |
| Spectacle Lake Dike | Low | Not assessed | 25 | Irrigation | 1969 |
| Schallow Lake Dam | Low | Not assessed | 13 | Recreation | 1954 |
| Beaver Lake Dam | Low | Not assessed | 10 | Recreation | 1910 |
| Campbell Lake Dam | Low | Not assessed | 10 | Recreation | 1948 |
| Sasse Reservoir Dam | Low | Not assessed | 10 | Recreation | 1910 |
| Bonaparte Lake Dam | Low | Not assessed | 9 | Irrigation | 1957 |
| Whitestone Lake Dam | Low | Not assessed | 9 | Irrigation | 1930 |
| Fish Lake Dam | Low | Not assessed | 7 | Recreation | 1920 |
| Davis Lake Dam Okanogan Co | Low | Not assessed | 7 | Recreation | 1974 |