Integrated Water Level System (IWLS)- Great Lakes and St. Lawrence River and Gulf
The Canadian Hydrographic Service (CHS) of Fisheries and Oceans Canada (DFO) operates, across the country, a integrated water level system (IWLS) tracking the fluctuation of Canadian waters level. SLGO disseminates the tide gauges data in real time continuously and also prediction and forecast data. 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 NAUTILO.
Data and resources
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This resource describes the web services offered by the Canadian Hydrographic Service (CHS) for accessing hydrographic data.HTML Open
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This resource provides a REST API for accessing data from the Integrated Water Level System (IWLS).HTML Open
Additional information
| Temporal extent | 2014-05-01 – ongoing |
|---|---|
| Vertical extent | 0.0 – 0.0 m |
| Date (creation) | 2014-05-01 |
| Date (publication) | 2017-03-27 |
| Status | onGoing |
| Update frequency | asNeeded |
| Metadata language | fr |
| License | Creative Commons Attribution 4.0 |
| Source metadata | ISO 19115 XML |
| Last updated | 2026-07-31 |
| Created | 2026-07-31 |
| API | package_show |