Is Nelson Lake Safe for Swimming?
Nelson Lake in Crawford County, Wisconsin has a water quality grade of D (Poor). Swimming not recommended, poor water quality with high algae risk. Water clarity: 3.8 ft visibility. Chlorophyll-a (algae): 30.6 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | D (Poor) |
| Water Clarity (Secchi Depth) | 3.8 ft |
| Chlorophyll-a (Algae) | 30.6 μg/L |
| Location | Crawford County, Wisconsin |
How does Nelson Lake compare?
With an overall water quality grade of D, Nelson Lake matches or beats the Wisconsin state average of Grade D. It ranks #1 of 2 lakes in Crawford County by water quality score.
Water clarity (Secchi depth) sits at 3.8 feet. That falls into moderate clarity — typical for lakes with some nutrient enrichment. Algae levels (chlorophyll-a) measure 30.6 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.