Apparently, Lake Superior replicates the surf found in the ocean well enough, that it's a huge draw for those willing to put up with the cold to experience it.
One such 'mythical' figure is Dan Schetter, located in the 'UP' or Upper Peninsula of Michigan. Whos entire life and identity is surfing the frigid waters of Superior:
And don't fret my ride or die Minnesotans, there are plenty of free and unique spirits on this side of the shore that give it go during the winter as well: