NOAA

National Oceanic and Atmospheric Administration

On Tuesday, The Watershed Center said Grand Traverse Bay was officially frozen. The official designation happens after West Bay is frozen from Traverse City to Power Island for more than 24 hours. Even though that's only a fraction of the bay, that's been the official measurement for over a hundred years.

Heather Smith, Grand Traverse Baykeeper at The Watershed Center, says the bay didn’t freeze over the last two winters – not since 2015. She says, since 1990, it has only frozen between 20 to 30 percent of the time.

The Great Lakes sunk to some of their lowest water levels ever two years ago. People were concerned about the low levels then, but today people are concerned for the opposite reason – water levels are high.