Monthly Historical Great Lakes Means

Access monthly historical Great Lakes means data relative to IGLD:

Lake Superior
Lakes Michigan/Huron
Lake St. Clair
Lake Erie
Lake Ontario
Montreal Harbour
Access Monthly Historical Great Lake Means relative to Chart Datum

Graphs of Monthly and Yearly Historical Mean Water Levels by Lake ( PDF , 376 KB )

This PDF contains a series of line graphs showing the Great Lakes water level data by station. The raw data is also found on the web pages in this section.

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Monthly Historical Great Lakes Means