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 ...

If all that water was spread across the contiguous United States ... Ultimately, the Great Lakes Observing System plans to make the lakebed map accessible to everyone and easy to use.

Michigan has the highest percentage of water area among U.S. states, at 41.5%. Alaska has the largest total water area, while ...

North America’s Great Lakes are the largest source of fresh surface water in the world. They are essential for cities, industries, and agriculture in eight states in the United States and one ...