Colorado has 9 tailings dams, of which 3 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 | Ten Mile Pond #3 Dam | Summit | 416 | High | Not assessed | |
| 2 | Mayflower Pond # 5 | Summit | 237 | High | Not assessed | |
| 3 | #1 Tailings Pond | Eagle | 235 | Significant | Not assessed | |
| 4 | Robinson | Eagle | 110 | High | Satisfactory | 1936 |
| 5 | Cotter Tailings | Fremont | 104 | Low | Not assessed | 1980 |
| 6 | Coyote | Moffat | 66 | Low | Not assessed | 1977 |
| 7 | Robinson Tailings Pond #2 Dam | Park | 52 | Significant | Not assessed | |
| 8 | St. Joe Tailings | Boulder | 42 | Low | Not assessed | 1936 |
| 9 | Unocal Storage Pond #3 | Garfield | 21 | Low | Satisfactory | 1989 |