The warmest water temperature of the Great Lakes today is 81.1 degrees in Lake Erie and the coldest is at 65.1 degrees in Lake Michigan.

The organization has been pushing since 2018 to create high-resolution maps of all five Great Lakes bottoms, but that's a daunting task. The lakes cover 94,250 square miles — an area larger than ...

A couple sits on a beach near Lake Erie, Wednesday, Sept. 4, 2024, in Oregon, Ohio. An effort to map the bottom of the Great Lakes is gaining momentum amid promises that it will help ...

The Great Lakes Observing System estimates mapping all five lakes will cost $200 million. The money would be spent on a combination of advanced sound and light detection technologies over ...