Language selection



National Hydrometric Network Basin Polygons

The prerelease V.2 (2022-06-17) of national hydrometric network basin polygons has been published on This prerelease version of the dataset contains drainage area polygons for over 7300 of the 7896 active and discontinued stations. The prerelease version will continue to be updated as new polygons are added and errors are corrected. Please do not hesitate to contact us to report any errors in the data or to provide comments. We can be reached at

Water Level and Flow

Real-time hydrometric data

Search by station name, station number, or location for real-time unit values or provisional daily mean values of water level and discharge data. Refine your search by data or station attributes. Results will be in list format.

Historical hydrometric data

Explore historical daily water level and flow (discharge) data collected at over 7900 hydrometric stations across Canada.

Hydrometric Station and Network Data

Access station and network metadata (such as station name, location, drainage area, data type, gauge type, stream order).

Tools and Downloads

Download freely-available hydrometric data products and hydrological modelling tools.


Learn about the federal-provincial/territorial and international partnerships of the national hydrometric program.


Learn about the Water Survey of Canada, and access other websites related to water data or water resource management.

News and Events

  • National Hydrometric Network Basin Polygons
  • Wateroffice Release
  • HYDAT Release
  • Height Modernization Status

What we are doing

Date modified: