When the Great Lakes Water Quality Agreement was passed in the 1970s, eutrophication was the big problem. Eutrophication occurs when too many nutrients enter a body of water, increasing the amount of ...

As executive director of the Great Lakes Observing System, she’s leading a campaign to map every meter of the lakes’ bottom.

As executive director of the Great Lakes Observing System, she's leading a campaign to map every meter of the lakes' bottom.

The dip of Arctic air into the Midwest expanded ice coverage across all 5 Great Lakes, some seeing greater increases than ...

The Great Lakes' water temperatures have been running ... Here’s the current ice cover map. Saginaw Bay is shallow and confined. Saginaw Bay is building ice quickly and will continue to do ...

Since 1973, ice coverage has fallen by 77% on Lake Michigan and 71% on the Great Lakes as a whole. That has a far-reaching ...

Lake effect snow is dependent on the Great Lakes water temperature and how much of the lake is frozen. But what does the current ice concentration look like and ...

Ice growth on the Great Lakes requires long spells of subfreezing temperatures like we’ve seen of late. The shallower lakes—Erie and Huron—are the first to build significant surface ice, with the ...