USACE CastleGreat Lakes Great Lakes
Daily Water Levels
for This Month in Feet


The United States Army Corps of Engineers collects and disseminates this water level data in cooperation with National Oceanic and Atmospheric Administration (NOAA) and the Canadian Hydrographic Service (CHS). All data are provisional and are referenced to IGLD 85. All data are displayed in Eastern Local Time. Blanks indicate data that are missing or not yet available. Mean levels are calculated by averaging the best available data at report generation and are subject to change. Long term average (LTA), maximum (MAX), and minimum (MIN) water level data for the month are provided for historical reference. Period of record 1918 - 2023.

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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 Construction Division, Hydraulics and Hydrology Branch, 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.