How Clean Is Mattoon Lake?
Mattoon Lake 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): 1.3 ft. Phosphorus: 206 µg/L. Trophic State Index: 77.
Cleanliness Snapshot
| Metric | Mattoon Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | F | D |
| Water Clarity (Secchi) | 1.3 ft | — |
| Phosphorus | 206 µg/L | <30 = clean |
| Trophic State Index | 77 | <50 = clean |
How does Mattoon Lake compare?
Mattoon Lake's grade of F falls below the Wisconsin state average of D. It ranks #1 of 1 lakes in Cumberland County by water quality score.