28Total Dams
10High Hazard
3Significant
Dam Safety in Spokane County, Washington
Spokane County has 28 dams tracked in the National Inventory of Dams. Of these, 10 are classified as high hazard — meaning failure would probably cause loss of human life. Another 3 carry a significant hazard classification. Currently, 5 dams have a condition assessment of poor or unsatisfactory.
The average dam in Spokane County is 62 years old. The most common purpose is other. The tallest dam is Nine Mile at 87 ft.
Explore more: Oldest dams in Washington · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Nine Mile | High | Satisfactory | 87 | Hydroelectric | 1908 |
| Spokane Hutterian Brethren Dam | High | Poor | 39 | Flood Risk Reduction | 2006 |
| Upriver Dam | High | Poor | 38 | Hydroelectric | 1937 |
| Reflection Lake South Dam | High | Fair | 28 | Recreation | 1955 |
| Deer Park Ww Storage Lagoon No 3 | High | Satisfactory | 24 | Other | 1997 |
| Deer Park Ww Storage Lagoons 1 & 2 | High | Satisfactory | 23 | Other | 1985 |
| Hog Lake Dam | High | Fair | 22 | Recreation | 1957 |
| Deer Park Aeration Lagoon | High | Fair | 17 | Other | 2023 |
| Newman Lake Flood Control Dam | High | Poor | 13 | Flood Risk Reduction | 1976 |
| Reflection Lake North Dam | High | Fair | 8 | Recreation | 1955 |
| Rockford Wastewater Pond No. 3 | Significant | Satisfactory | 24 | Other | 1999 |
| Fairfield Sewage Aerated Lagoon - Lagoon 1 | Significant | Fair | 13 | Other | 2003 |
| Fairfield Sewage Equalization Basin - Lagoon 2 | Significant | Fair | 12 | Other | 1966 |
| Williams Lake Sewer Dist 2 Lagoons | Low | Not assessed | 30 | Other | 2007 |
| Long Lake East Dam | Low | Fair | 25 | Fish and Wildlife Pond | 1960 |
| Upper Falls Intake Dam | Low | Satisfactory | 20 | Hydroelectric | 1922 |
| Chapman Lake Dam | Low | Not assessed | 18 | Recreation | 1940 |
| Dragoon Lake Dam | Low | Not assessed | 18 | Recreation | 1913 |
| Lower Pine Lake Dam | Low | Satisfactory | 18 | Fish and Wildlife Pond | 1940 |
| Martin Dam | Low | Not assessed | 16 | Irrigation | 1972 |
| Williams Dam | Low | Not assessed | 14 | Flood Risk Reduction | 1982 |
| Dosser Reservoir Dam | Low | Not assessed | 14 | Irrigation | 1959 |
| Upper Turnbull Dam | Low | Fair | 12 | Fish and Wildlife Pond | 1960 |
| Blackhorse East Dam | Low | Poor | 12 | Fish and Wildlife Pond | 1960 |
| Middle Pine Lake Dam | Low | Poor | 11 | Fish and Wildlife Pond | 1938 |
| Wandermere Lake Dam | Low | Not assessed | 10 | Recreation | 1930 |
| Upper Blackhorse Dam | Low | Fair | 10 | Fish and Wildlife Pond | 1960 |
| Lower Turnbull Dam | Low | Fair | 8 | Fish and Wildlife Pond | 1960 |