There are over 15,000 lakes in Wisconsin. Of these, about 40 percent have been named. Excluding Lake Michigan and Lake Superior, Lake Winnebago is the largest lake by area, largest by volume and the lake with the longest shoreline. The deepest lake is Wazee Lake, at 350 feet (107 meters). The deepest natural lake is Green Lake, at 237 feet (72 meters). The largest man-made lake is Petenwell Lake. Many lakes have the same names, with over 150 named Mud Lake and over 100 named Bass Lake.
Below is the list of named lakes/reservoirs in Wisconsin, as identified by the USGS and/or the WIDNR. Areas and max depths are provided by WIDNR unless otherwise noted. Alternate names are indicated in parentheses. Only included are lakes over 100 acres.
The WIDNR identifies over 8,000 unnamed lakes/reservoirs in Wisconsin, although this is not an exhaustive list. Below is the list of those greater than 100 acres identified by the WIDNR. Areas and max depths are provided by WIDNR unless otherwise noted.
Here is the breakdown of the lakes by county. The northern counties have a higher density of lakes as a result, in part, from the Laurentide ice sheet during the Wisconsin glaciation. As counties in the Driftless Area of southwestern Wisconsin were not covered by ice at that time, there are significantly fewer lakes. The unnamed lakes column only includes those identified by the WIDNR, which is not exhaustive. The sum of the columns do not equal the Wisconsin total as lakes shared by multiple counties are listed under each county.