How Clean Is Thayer Lake?
Thayer 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): 3.5 ft. Chlorophyll-a (algae): 34.3 µg/L. Trophic State Index: 62.
Cleanliness Snapshot
| Metric | Thayer Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | D | D |
| Water Clarity (Secchi) | 3.5 ft | — |
| Chlorophyll-a (Algae) | 34.3 µg/L | <10 = clean |
| Trophic State Index | 62 | <50 = clean |
How does Thayer Lake compare?
Thayer Lake's grade of D matches or beats the Wisconsin state average of D. It ranks #2 of 6 lakes in Union County by water quality score.