Is Knob Noster S.P. Lake 2 Safe for Swimming?
Knob Noster S.P. Lake 2 in Johnson County, Wisconsin has a water quality grade of C (Fair). Generally safe for swimming, moderate water quality. Water clarity: 3.9 ft visibility. Phosphorus: 29 µg/L. Chlorophyll-a (algae): 10.6 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | C (Fair) |
| Water Clarity (Secchi Depth) | 3.9 ft |
| Phosphorus | 29 μg/L |
| Chlorophyll-a (Algae) | 10.6 μg/L |
| Location | Johnson County, Wisconsin |
How does Knob Noster S.P. Lake 2 compare?
With an overall water quality grade of C, Knob Noster S.P. Lake 2 matches or beats the Wisconsin state average of Grade C. It ranks #3 of 5 lakes in Johnson County by water quality score.
Water clarity (Secchi depth) sits at 3.9 feet. That falls into moderate clarity — typical for lakes with some nutrient enrichment. Algae levels (chlorophyll-a) measure 10.6 µg/L — moderate; acceptable for swimming on most days, but worth checking advisories.