lake and east of Wisconsin Highway 26.() References External links Rock Koshkonong Lake District Lake Koshkonong data and Lake Koshkonong Wetland Association Visitor & Tourism | Rock Koshkonong Business Association Historical tidbits about the Lake from the Janesville Gazette Koshkonong - The Lake We Live On Lakes of Dane County, Wisconsin Lakes of Jefferson County, Wisconsin Lakes of Rock County, Wisconsin Dams in Wisconsin Reservoirs in Wisconsin United States local public utility dams