How Clean Is Nelson Lake?
Nelson 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): 3.8 ft. Chlorophyll-a (algae): 30.6 µg/L. Trophic State Index: 61.
Cleanliness Snapshot
| Metric | Nelson Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | D | D |
| Water Clarity (Secchi) | 3.8 ft | — |
| Chlorophyll-a (Algae) | 30.6 µg/L | <10 = clean |
| Trophic State Index | 61 | <50 = clean |
How does Nelson Lake compare?
Nelson Lake's grade of D matches or beats the Wisconsin state average of D. It ranks #1 of 2 lakes in Crawford County by water quality score.