Ice on the Great Lakes

On February 14, the Great Lakes had 68.3% ice coverage. Lake Erie is the shallowest Great Lake and always freezes faster than the other, 
deeper lakes. 
In the NOAA image below, the darker the area on the lake, the more complete the ice coverage.

Lake Michigan is unique. It is deeper than Lake Huron, and prevailing winds tend to break up the ice that forms on edge of the west side of the lake, then move it across to the eastern shore.