WATER LEVELS PLUS WIND: Wind drives the water away:

During March, April, May and June, water levels rise because ice is thawing. By the middle of July, water levels peak and begin to decline again because of evaporation.

The area is also going through what experts call a seiche, when wind blows water to one end of the lake...

"This is not something that doesn't happen on a frequent basis," he said. "It happens, just a lot of times we don't notice because it's not as obvious as it is now."

The U.S. Coast Guard, however, had to move two of its boats from Marblehead to the Jackson Street Pier in Sandusky, something they haven't had to do in years. Also in the bay, a wrecked freighter whose frame has remained where it was since it burned to the waterline in the 1930s was revealed as water levels dropped.

Via Great Lakes Ship Watchers.