Washington has 26 tailings dams, of which 4 carry a high hazard classification. Tailings dams contain waste material from mining operations — typically a slurry of finely ground rock left over after valuable minerals have been extracted.
| # | Dam | County | Height (ft) | Hazard | Condition | Year |
|---|---|---|---|---|---|---|
| 1 | Centralia Coal Mine Dam No 3d | Lewis | 285 | Low | Not assessed | 1988 |
| 2 | Kinross Gold Kettle River Tailings Dam | Ferry | 189 | High | Satisfactory | 1994 |
| 3 | Centralia Coal Mine Dam No 3b | Lewis | 140 | Significant | Fair | 1980 |
| 4 | Centralia Coal Mine Dam No 3c North | Lewis | 134 | Significant | Satisfactory | 1987 |
| 5 | Hecla-day Mine Aspen Tailings Dam | Ferry | 95 | Significant | Fair | 1940 |
| 6 | Van Stone Tailings Dam | Stevens | 90 | Significant | Poor | 1970 |
| 7 | Pend Oreille Mine Ne Tailings Dam | Pend Oreille | 72 | Significant | Satisfactory | 2003 |
| 8 | Centralia Coal Mine Dam No 3c South | Lewis | 69 | Significant | Satisfactory | 1987 |
| 9 | Pend Oreille Mine Nw Tailings Dam | Pend Oreille | 67 | Significant | Satisfactory | 2003 |
| 10 | Western Nuclear Tailings Pond | Stevens | 62 | Significant | Satisfactory | 1977 |
| 11 | Hecla-day Mine Aspen Tailings Saddle Dam | Ferry | 40 | Significant | Fair | 1987 |
| 12 | Van Stone Pit Lake Dam | Stevens | 25 | High | Poor | 1999 |
| 13 | Kinross Old Reclaim Pond | Ferry | 24 | Significant | Satisfactory | 2008 |
| 14 | Centralia Coal Mine Dam No 3c East | Lewis | 21 | Significant | Satisfactory | 1987 |
| 15 | Centralia Coal Mine Dam No 5c | Lewis | 20 | Low | Not assessed | 1970 |
| 16 | Centralia Coal Mine Dam No 44 | Lewis | 19 | Low | Not assessed | 1975 |
| 17 | Centralia Coal Mine Dam No 3a | Lewis | 18 | Low | Not assessed | 1970 |
| 18 | Centralia Coal Mine Dam No 8a | Lewis | 18 | High | Satisfactory | 1972 |
| 19 | Centralia Coal Mine Dam No 36a | Lewis | 14 | Low | Not assessed | 1989 |
| 20 | Centralia Coal Mine Dam No 5 | Lewis | 14 | Low | Not assessed | 1971 |
| 21 | Centralia Coal Mine Dam No 36 | Lewis | 13 | Low | Not assessed | 1989 |
| 22 | Centralia Coal Mine Dam No 19a | Lewis | 13 | Low | Not assessed | 1977 |
| 23 | Centralia Coal Mine Dam No 19 | Lewis | 13 | Low | Not assessed | 1977 |
| 24 | Centralia Coal Mine Dam No 6b | Lewis | 13 | Low | Not assessed | 1970 |
| 25 | Centralia Coal Mine Dam No 8 | Lewis | 12 | High | Satisfactory | 1972 |
| 26 | Centralia Coal Mine Dam No 20c | Thurston | 10 | Low | Not assessed | 1981 |