A word of note, even though the Ice is thick enough to venture out on (within the Harbor), there are some soft spots around the edges, so be careful. This being said, the Ice on Lake Erie is not safe and has many fissures, cracks and is shifting with the wind, do not venture out on that Ice. This photo was taken 3/3/08.
Check out satellite images of the Great Lakes at: http://coastwatch.glerl.noaa.gov/modis/region_map.html