Lake Koshkonong is historically a marsh. The lake was created by the Indianford Dam. The average depth of Lake Koshkonong is six feet. Lake Koshkonong is 10,500 acres which makes it the second largest body of open water in the state of Wisconsin. Lake Winnebago is the largest body of open water in the state, and a true lake.
Lake Koshkonong is one of South Central Wisconsin residents favorite places to visit for outdoor recreation. During the summer season all types of boats can be found on the lake. Water sports such as water skiing, tubing, and jet skiing are also popular past times on Lake Koshkonong. The fishing is great on the lake and the fish population is maintained by the Wisconsin DNR. Every year the DNR oversees the removal of rough fish from the lake by commercial fisherman and stock the lake with millions of game fish every year. A recent survey of the lake by the DNR found 28 species of fish in the lake including perch, walleye, channel and flathead catfish, white bass, largemouth and small mouth bass, bluegill, crappie, muskie, northern pike, as well as rough fish species such as carp, buffalo, and sheepshead.
The Lake Koshkonong area is also very popular in the winter months. When the ice becomes over 6" thick it is not uncommon to see people riding snowmobiles and ATV's on the frozen lake.
Each year The Rock River Koshkonong Association sponsors the Koshkonong Bounty Hunt ice fishing tournament. This ice fishing tournament offers prizes for largest fish and tagged fish caught from the lake.
A local Newville bar, the Anchor Inn sponsors two major lake parties each year, the "Break In the Weather" party in early spring and "Winter Waterland" which consists of icey belly flops and water skiers in the ice cold water.
See a list of available homes, including lake homes on Lake Koshkonong, here.