GRCA Monitoring Data Explorer
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GRCA has a number of automatic water level gauges on rivers and streams at important locations throughout the Grand River watershed. Weather forecasts are monitored regularly to detect conditions that could cause flooding in the Grand River watershed.
For a comprehensive list of pre-made charts, please visit the River Data section of our website. To download data, use our online download form or data API located on the Grand River Information Network (GRIN).
All timeseries are updated 30 minutes past the hour to provide the last 5-days of hourly data from GRCA's monitoring network. Station parameters are organized by NOAA Shef code:
- QR Discharge, River. Measure in cubic metres per second (m3/s)
- PN Precipitation Normal. Measured in millimetres (mm)
- TA Temperature, Air. Measured in degrees celsius (°C)
The radar displays two modes, Rain or Snow, depending on the season. Rain mode (default April 1 to November 30; expressed in mm/h) would display the radar for the reflectivity of liquid precipitation. Snow mode (default December 1 to March 31; expressed in cm/h) would display the radar for the reflectivity of frozen precipitation.
Caution: Users of the GRCA's real-time data are cautioned to consider the provisional nature of the information before using it for decisions that concern personal or public safety or the conduct of business. The Grand River Conservation Authority assumes no responsibility for the correctness of the information contained in this website nor liability to any user of such information, regardless of the purpose. Warning: River levels and flows can change rapidly.
All Monitoring web services and data are made available under the terms of the GRCA Open Data Licence. We continue to review our data and licensing approach and are committed to providing access to more data over time. GRCA may make changes to the terms of these licenses from time to time, to be released in the form of a new version of a licence. Your use of the information will be governed by the terms of the licence in force as of the date you accessed the information.