Is Lake Koshkonong Safe for Swimming?
Lake Koshkonong in Jefferson County, Wisconsin has nutrient and algae measurements on record from state and federal monitoring. A water-quality reading is not a swimming clearance. The state water agency and county health departments post current advisories; check them before you swim.. Water clarity: 1.7 ft visibility. Phosphorus: 287 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Water Clarity (Secchi Depth) | 1.7 ft |
| Phosphorus | 287 μg/L |
| Maximum Depth | 7 ft |
| Location | Jefferson County, Wisconsin |
How does Lake Koshkonong compare?
With an overall water-quality readings of —, Lake Koshkonong runs above the Wisconsin state average. It ranks #7 of 7 lakes in Jefferson County by water quality score.
Water clarity (Secchi depth) sits at 1.7 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff.
Watch Lake Koshkonong water quality
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