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?
On nutrient and algae readings, Lake Koshkonong runs above the Wisconsin state average. It ranks #7 of 7 lakes in Jefferson County on nutrient and algae readings.
Water clarity (Secchi depth) sits at 1.7 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff.
Stays via Stay22
Where to stay near Lake Koshkonong
Compare cabins, hotels, and vacation rentals near Lake Koshkonong in Jefferson County, Wisconsin. Live availability and prices for your nights. Switch the map to Satellite to see how close each stay is to the water.
Top-rated places to stay near Lake Koshkonong
Prices for Nov 6–8, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Lake Koshkonong?
Get lake water-quality updates plus the best cabin & lodging deals near Lake Koshkonong — straight to your inbox. No spam, unsubscribe anytime.
Watch Lake Koshkonong water quality
Get an email when the clarity or algae readings change. Unsubscribe anytime.