Minimum/Maximum Levels

Historic Minimum Monthly Mean Water Levels
1918 to 2001. Levels relative to International Great Lakes Datum, 1985. Source: U.S. Army Corps of Engineers.

Lake

Feet

Meters

Record Year

Superior

-1.8

-0.5

1926

Huron*

-1.4

-0.4

1964

Michigan*

-1.4

-0.4

1964

St. Clair

-1.8

-0.5

1936

Erie

-1.0

-0.3

1936

Ontario

-1.4

-0.5

1934

*the two lakes share a common water level through the Straits of Mackinac.



Historic Maximum Monthly Mean Water Levels
1918 to 2001. Levels relative to International Great Lakes Datum, 1985. Source: U.S. Army Corps of Engineers.

Lake

Feet

Meters

Record Year

Superior

+2.3

+0.7

1985

Huron*

+4.9

+1.5

1986

Michigan*

+4.9

+1.5

1986

St. Clair

+5.0

+1.6

1986

Erie

+5.1

+1.6

1986

Ontario

+5.3

+1.6

1952






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