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UMD researchers reveal data from wetland studies in the Northland
KQDS-TV - Duluth, MN (7/27)
From Green Bay Wisconsin to Duluth Minnesota, research is being conducted to figure out the current status of our lakes and rivers when it comes to invasive species, and other aquatic trespassers.

Coastal Centre concerned about plastic pollution in Lake Huron
Owen Sound Sun Times (7/17)
Everyone has a role to play in turning the tide on the growing problem of plastic pollution in the Great Lakes. That's the message from Ontario's Lake Huron Centre for Coastal Conservation outreach specialist, who is working to educate people on simple ways to help combat the issue.

Elementary Adventure Day outing provides hands-on fun
The Ashland Daily Press (7/12)
Just over half-a-dozen youngsters gathered at the Northern Great Lakes Visitor Center, in Wisconsin, to participate in the first of this year’s three 4-H Elementary Adventure Day’s.

Summer interns help to research Lake Erie issues
The Toledo Blade (7/5)
Eleven college and university students from across the United States are studying freshwater lake issues this summer at the University of Toledo’s Lake Erie Center.

Lake State opens Sea Grant office
Sault Ste. Marie Evening News (6/29)
Lake Superior State University officially welcomed its new Michigan Sea Grant office to campus with a ribbon cutting ceremony Monday morning.

TEACH Calendar of Events
What's going on in your neighborhood this month? Meet other people and learn together at recreational and educational events! Our new dynamic calendar is updated daily with current educational events.
Water levels on the Great Lakes

3 | History repeating itself

Long-term water level fluctuations are shown on a hydrograph, a plot of lake levels versus time. The hydrographs on this page show average monthly water levels for each of the Great Lakes and Lake St. Clair since the middle of the 19th century. Levels have been measured on most lakes since 1865, with the current network of water level gages operating since 1918.

As the hydrographs illustrate, Great Lakes water levels tend to follow a cyclical pattern. The Great Lakes system experienced extremely high water levels in the 1870s, early 1950s, early 1970s, mid-1980s and mid-1990s. Extremely low water levels were experienced in the late 1920s, mid-1930s, mid-1960s, and in the late 1990s leading up to today.

Lake Superior
Lake Superior historical levels. Click to see larger image.

Lakes Michigan-Huron
Lakes Michigan-Huron historical levels. Click to see larger image.

Lake St. Clair
Lake St. Clair historical levels. Click to see larger image.

Lake Erie
Lake Erie historical levels. Click to see larger image.

Lake Ontario
Lake Ontario historical levels. Click to see larger image.

See also: Current Great Lakes-St. Lawrence Water Levels

Graphics courtesy U.S. Army Corps of Engineers, Detroit District.

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