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When the winter ice starts to break up the prevailing wind pushes the ice towards the shore where it’s starts to pile up and works its way onto the land. It will destroy docks, boat sheds, take down trees and even houses if the shove is severe enough. Google Lake Winnebago ice shove. Some of the videos are spectacular and scary all at the same time.
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The city of Oshkosh has a public park with a beach. (Menominee Park) My wife and boys usually escape from aviation heaven for one day and go swimming there.
https://www.yelp.com/biz/menominee-park-oshkosh
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A few years ago someone set up a swimming pool (I think it was someone affiliated with SunNFun) just west of Jerry Slegar and was giving scuba demos in it.