Arizona has 11 tailings dams, of which 5 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 | 1 West | Graham | 400 | Low | Not assessed | |
| 2 | Sierrita | Pima | 350 | High | Not assessed | |
| 3 | 3 West | Graham | 307 | Low | Not assessed | |
| 4 | 4 West | Graham | 226 | High | Not assessed | |
| 5 | Silver Basin 1 | Graham | 225 | Significant | Not assessed | |
| 6 | Mineral Park Tailings Dam | Mohave | 200 | Significant | Not assessed | |
| 7 | Number 7 | Pima | 189 | High | Not assessed | |
| 8 | D Tailings | Pinal | 150 | Significant | Not assessed | |
| 9 | Ab-bc | Pinal | 150 | High | Not assessed | |
| 10 | 2 West | Graham | 125 | Low | Not assessed | |
| 11 | Number 4 | Pima | 40 | High | Not assessed |