How Clean Is Otter Lake?
Otter Lake has poor water quality, with elevated phosphorus and algae. It received a water quality grade of D (Poor) based on EPA monitoring data. Water clarity (Secchi depth): 1.8 ft. Phosphorus: 37 µg/L. Trophic State Index: 62.
Cleanliness Snapshot
| Metric | Otter Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | D | D |
| Water Clarity (Secchi) | 1.8 ft | — |
| Phosphorus | 37 µg/L | <30 = clean |
| Trophic State Index | 62 | <50 = clean |
How does Otter Lake compare?
Otter Lake's grade of D matches or beats the Wisconsin state average of D. It ranks #2 of 3 lakes in Macoupin County by water quality score.