How Clean Is Hawthorn Lake?
Hawthorn 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): 2.4 ft. Chlorophyll-a (algae): 27.5 µg/L. Trophic State Index: 64.
Cleanliness Snapshot
| Metric | Hawthorn Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | D | D |
| Water Clarity (Secchi) | 2.4 ft | — |
| Chlorophyll-a (Algae) | 27.5 µg/L | <10 = clean |
| Trophic State Index | 64 | <50 = clean |
How does Hawthorn Lake compare?
Hawthorn Lake's grade of D matches or beats the Wisconsin state average of D. It ranks #1 of 3 lakes in Mahaska County by water quality score.