In this Jan. 7, 2014 photo ice forms on parts of a dock on West Grand Traverse Bay near the Great Lakes Maritime Academy in Traverse City, Mich. It may be hard to think of this week's deep freeze as anything but miserable. But in the realm of nature, there are silver linings: Heavy ice cover may help raise low water in the Great Lakes and protect shorelines and wetlands from erosion. (AP Photo/ Traverse City Record-Eagle, Keith King, File)