US Army Corps of Engineers
Detroit District

Great Lakes

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Great Lakes Water Level Data

All levels are referenced to the International Great Lakes Datum of 1985 (IGLD 85). Water levels have been coordinated with Canada for 1918-2018.

For water level forecasts, click here.



Monthly mean lakewide average water levels

 

Download the Long Term Average, Maximum, and Minimum Great Lakes Water Levels in english units (feet).

 Download the Long Term Average, Maximum, and Minimum Great Lakes Water Levels in metric units (meters).

Download the coordinated monthly mean water levels in english units.

Download the coordinated monthly mean water levels in metric units.

Graph of Great Lakes monthly mean lakewide average water levels from 1918-present.

 



 

 

Daily Lakewide Average Water Levels

 

Great Lakes Water Levels Report (Meters)

 

Current Month

Last Month

Two Months Ago

Three Months Ago

Graph of Great Lakes daily lakewide average water levels for this year and the previous year.
 

Great Lakes Water Levels Report (Feet)

 

Current Month

Last Month

Two Months Ago

Three Months Ago

 



 

 

Connecting Channels Water Levels

Detroit River

St. Clair River

St. Marys River

 



 

NOAA Water Level Gage Data

Preliminary Great Lakes water level gage data

Historic Great Lakes water level gage data



For water level forecasts, click here.

Document Information and Assistance

NOTICE:  Not all documents accessible via this page are readable using optical character recognition (OCR). For more information and/or assistance please call 313-226-6441.

Detroit District Disclaimer

NOTICE: All data contained herein is preliminary in nature and therefore subject to change. The data is for general information purposes ONLY and SHALL NOT be used in technical applications such as, but not limited to, studies or designs. All critical data should be obtained from and verified by the United States Army Corps of Engineers, Detroit District, Engineering and Technical Services, Great Lakes Hydraulics and Hydrology Office, 477 Michigan Ave., Detroit, MI 48226. The United States of America assumes no liability for the completeness or accuracy of the data contained herein and any use of such data inconsistent with this disclaimer shall be solely at the risk of the user.