Fisheries and Oceans Canada * Pêches et Océans Canada Canada
Français CHS HQ Water Levels Canada Site
CHS crest       The Canadian Hydrographic Service
      Central and Arctic Region

Link to Monthly Bulletin

Monthly Water Level Bulletin

  • Monthly Water Level Bulletin Great Lakes-Montreal Harbour
  • Level News

Permanent Gauging Network

  • Central and Arctic Region's network of tide and water level gauging stations.

Recent & Forecast Data

  • Voice Announcements
  • Hourly Heights
  • Weekly Water Level Bulletin
  • Monthly Water Level Bulletin St. Lawrence River

Historical Data

  • Lake Network Monthly Means

Other Information

  • The Great Lakes St. Lawrence River System
  • Natural Factors Affecting Lake Levels
  • Fluctuations in Lake Levels - types
  • Circulation in the Great Lakes
  • Datums - explanation of datums used for water levels and navigational charts


The Tides Currents and Water Levels Section is a unit within the Technical Services Division. The Section is responsible for the collection of tide, current and water level information in support of CHS hydrographic survey and charting responsibilities and of marine navigation in the region. The Section operates a permanent network of tide and water level gauging stations throughout the Great Lakes, Hudson Bay and the Arctic.

To the left of this screen are links to some of the data and information products available from this unit. If more detailed information is required, please contact :

Toll Free:
1-877-CHS-LINK (877-247-5465)

or by e-mail at

This symbol is used throughout these pages to indicate data or references prepared under the auspices of the binational Coordinating Committee on Great Lakes Basic Hydraulic and Hydrologic Data.

Looking for the latest data on water levels in the Great Lakes? Don't miss the new hydrology section on the Great Lakes Information Network. Thanks to a partnership between the Great Lakes Commission and the Coordinating Committee on Great Lakes Basic Hydraulic and Hydrologic Data, the GLIN hydrology section has been greatly enhanced to provide a centralized means to access hydrology information from the many different agencies responsible for its collection and dissemination. Interactive maps provide the most recent water levels data for the different gauging stations; some as often as every six minutes. The site also links to forecasted and historical data, and includes overviews on various hydrologic topics from experts on the Coordinating Committee.

Great Lakes-St. Lawrence Hydrology
Last Updated: 03/08/2013

Important Notices

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