Wisconsin's Largest Lakes


I have seen Lake Koshkonong ranked anywhere between second and seventh as far as how big it is compared to other inland lakes in Wisconsin. I did some digging on the Wisconsin DNR Lake Maps Directory and found out is is actually the eighth largest lake in Wisconsin. However, calling it the seventh largest inland lake may still be accurate as Lake Pepin is on the Mississippi River, and technically not "inland." I may be wrong, but my guess is that it was the second largest at the time the dam was built and the lake was created. It has since fallen in the rankings as more dams were built across Wisconsin rivers.

Lakes sorted by acreage from largest to smallest. Only lakes over 5,000 acres are included.

# Name County Area
1 Lake Winnebago Calumet, Fond du Lac, Winnebago 137,708
2 Petenwell Flowage Adams, Juneau, Wood 23,040
3 Lake Pepin Pepin 19,649
4 Chippewa Flowage Sawyer 15,300
5 Lake Poygan Winnebago 14,102
6 Castle Rock Flowage Adams, Juneau 13,955
7 Turtle-Flambeau Flowage Iron 13,545
8 Lake Koshkonong Dane, Jefferson, Rock 10,460
9 Lake Mendota Dane 9,842
10 Lake Wisconsin Columbia, Dane, Sauk 9,000
11 Lake Butte Des Mortes Winnebago 8,857
12 Lake Onalaska LaCrosse 7,688
13 Green Lake Green Lake 7,346
14 Big Eau Pleine Reservoir Marathon 6,830
15 Beaver Dam Lake Dodge 6,542
16 Willow Flowage Oneida 6,306
17 Lake Wissota Chippewa 6,300
18 Lake Shawano Shawano 6,063
19 Lake Puckaway Green Lake 5,433
20 Lake Geneva Walworth 5,262
21 Lac Courte Oreilles Sawyer 5,039

 


 
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