How Clean Is Charles Mill Reservoir?
Charles Mill Reservoir has very poor water quality and a high algae bloom risk. It received a water quality grade of F (Very Poor) based on EPA monitoring data. Water clarity (Secchi depth): 0.9 ft. Trophic State Index: 79.
Cleanliness Snapshot
| Metric | Charles Mill Reservoir | Wisconsin avg |
|---|---|---|
| Overall Grade | F | D |
| Water Clarity (Secchi) | 0.9 ft | — |
| Trophic State Index | 79 | <50 = clean |
How does Charles Mill Reservoir compare?
Charles Mill Reservoir's grade of F falls below the Wisconsin state average of D. It ranks #1 of 1 lakes in Ashland County by water quality score.