This stuff happens up north. Lakes freeze, wind blows, ice breaks up, wind blows the ice into piles on land.
It IS, of course, a bit late in the year for this, but it is not rare. If your house is near the water level, you are asking for trouble.
Here’s some shots from Grand Lake St. Marys in Ohio. Click on the thumbnails below for some more shots. Ice seems to have been about 8 inches thick when the wind broke it up.
http://www.dailystandard.com/archive/2008-01-31/pictures/4437
Here are some more great shots. Scroll down to “Wind-Blown Ice Photos.”
http://www.dnr.state.mn.us/waters/watermgmt_section/pwpermits/ice_ridge_photos.html
It happens on the Great Lakes, too.
Mother Nature just showing and being BOSS.