Canadian permanent water level network (PWLN)- Great Lakes and St. Lawrence River and Gulf

The Canadian Hydrographic Service (CHS) of Fisheries and Oceans Canada (DFO) operates, across the country, a permanent water level network (PWLN) tracking the fluctuation of Canadian waters level. SLGO disseminates the tide gauges data in real time continuously since April 2014 and also prediction and forecast data. Data prior to 2014 are available on the SLGO through the EDMS (DFO) application. For more information, please see the data context.

Also, using the water level forecast data, the dynamic vertical clearance, the vertical distance between an obstacle and the surface of the water, is calculated for some St. Lawrence obstacle such as the Québec Bridge. For more information, please see the data contexte.

Parameters: water level, water temperature , salinity, air pressure, dynamic vertical clearance.

View data in the MARINE CONDITIONS application.

Access and Use

Licence: Creative Commons Attribution 4.0

Data and Resources


Dataset extent

Map data © OpenStreetMap contributors

Metadata Reference Date(s) June 23, 2022 (Creation)
June 23, 2022 (Revision)
Dataset Reference Date(s) March 27, 2017 (Creation)
February 21, 2020 (Revision)
Frequency of Update Continual

Responsible Party 1
Pêches et Océans Canada
Responsible Party 2
Marc Journault
Pêches et Océans Canada - Service hydrographique du Canada
Point of Contact

Field Value
Ocean Variables Sea Surface Height
Scope Dataset
Status On Going
Spatial Extent { "coordinates": [ [ [ -49.8977556, 54.7553201 ], [ -95.7170708, 54.7553201 ], [ -95.7170708, 40.0116142 ], [ -49.8977556, 40.0116142 ], [ -49.8977556, 54.7553201 ] ] ], "type": "Polygon" }
North Bounding Latitude 54.7553201
South Bounding Latitude 40.0116142
East Bounding Longitude -49.8977556
West Bounding Longitude -95.7170708
Temporal Extent
Default Locale French
Citation identifier