[timlilje]

I have seen this but only on rivers. In Toledo Ohio the Maumee would freeze completely over and the water would backup behind it. Since there was no place to go the water went under the ice lifting the ice up and on the shore. I have seen 4-5ft thick slabs as big as a house move quite a ways inland!!

[markomalley]

I have seen this but only on rivers.

Me too. But in mid-May. Not that far south (I mean, we're talking Mille Lacs, not Red Lake).