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): 1.3 ft. Chlorophyll-a (algae): 23.1 µg/L. Trophic State Index: 67.
Cleanliness Snapshot
| Metric | Nelson Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | D | C |
| Water Clarity (Secchi) | 1.3 ft | — |
| Chlorophyll-a (Algae) | 23.1 µg/L | <10 = clean |
| Trophic State Index | 67 | <50 = clean |
How does Nelson Lake compare?
Nelson Lake's grade of D falls below the Wisconsin state average of C. It ranks #3 of 3 lakes in Oliver County by water quality score.