The overall highest percentage of ice coverage for all the Great Lakes took place in 1979 when they were 94.7% covered, NOAA said. Lake Superior has frozen over once since 1973, according to NOAA.

So far this winter season, maximum ice cover peaked at about 52% across the Great Lakes after February's polar vortex brought gripping cold to the region. That number is about the same as the long ...

The overall highest percentage of ice coverage for all the Great Lakes took place in 1979 when they were 94.7% covered, NOAA said.

Lake Huron: 195 feet in average depth, and approximately 750 feet at maximum. The overall highest percentage of ice coverage for all the Great Lakes took place in 1979 when they were 94.7% covered, ...