USACE CastleGreat Lakes St. Marys River
Hourly Water Levels
for the Last 7 Days in Meters


The United States Army Corps of Engineers (USACE) collects and disseminates this water level data in cooperation with the 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. USACE data collection operates seasonally as weather permits. Blanks indicate data that are missing or not yet available.

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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.