Lake Koshkonong

Lake Koshkonong at a glance

The center of the lake is at 42.8742, -88.9581. Releases go downstream into the Rock River. Maximum depth is around 7 feet.

No agency lists a named swimming spot at Lake Koshkonong. Shoreline access here is likely informal. Shoreline access on lakes like this one is often informal and unsigned. If you need a named beach, Esther Beach on Lake Monona is some 24 miles from here.

No public sensor reports water temperature at Lake Koshkonong, so the panel shows air temperature and wind. Most Wisconsin day-use areas open for the summer season and close outside it. If the water looks like pea soup or paint, stay out and report it to the managing agency.

Nearby water includes Lake Kegonsa (Wisconsin, 16 mi), Lake Waubesa (Wisconsin, 21 mi) and Lauderdale Lakes (Wisconsin, 21 mi). Wisconsin has 34 lakes on this site in total.

The level comes from gauge 05427235, LAKE KOSHKONONG NEAR NEWVILLE, WI, and carries the time it was taken. Over the record shown on the level page the gauge has moved between 775.63 ft and 781.15 ft (low on 2025-11-11, high on 2026-04-24). The last value stored here, 776.57 ft, is from 2026-09-09. When the pool drops, shoreline beaches grow and shallow ramps can run out of concrete.