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 effort, the marine scientist says, will pinpoint hundreds of ...

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

Data, maps, and reports are available at the lake-level (Great Lakes), for each state, and for the five-state region as a whole by clicking on the links below: Brief reports that summarize, analyze, ...

Due to a recent cold snap, ice coverage on the Great Lakes is significantly higher than last year. Lake Erie is almost ...

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 ...