Notice
A maintenance activity is scheduled to start at 12:00 (EDT), ending 14:30 (EDT) on September 17. During the maintenance, the historical data access will be interrupted. We will monitor our system diligently to detect the interruption and will work to resume the data flow as quickly as possible. Your understanding and patience during this period are greatly appreciated. If you have any questions, please send via Contact Us. Note that the real-time data access is not impacted.
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, Downloads, and Complimentary Data
Download freely-available hydrological modelling tools and complimentary data products, including the HYDAT database, supporting documentation for the Reference Hydrometric Basin Network, and the Canadian Surface Reanalysis (CaSR).
Partners
Learn about the federal-provincial/territorial and international partnerships of the national hydrometric program.
Resources
Learn about the Water Survey of Canada, and access other websites related to water data or water resource management.
NHS Water Watch
View the streamflow (discharge) current conditions by comparing the real-time discharge with the historical daily discharge.
News and Events
- HYDAT Release (2026-07-17)
- Unit Data (2011 - 2026, updated on 2026-05-11)
- Updated drainage areas for WSC hydrometric basins
- Wateroffice Release 58 (2026-02-26)
- Upcoming Enhancements to Network Change Communications
- Datamart URL change (2025-10-07)
- Auto-QAQC Pilot Launch (2025-06-02)
- Height Modernization Status
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