Downloads Monitoring Data

Grand River Conservation Authority monitors stream flow, water quality, meteorological conditions, and operational conditions at GRCA dams. The information is collected and transmitted from each station to GRCA's Operations Centre in Cambridge, Ontario once an hour.

Users of GRCA's near 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. These data are not citable until reviewed and approved by GRCA.

Monitoring Data Download

All GRCA Monitoring Data is made available under the GRCA Open Data Licence.

Selecting a parameter will update the Locations list

A maximum of 5 locations per request

From Date (yyyy-mm-dd)

To Date (yyyy-mm-dd)

Note: Charts will not show metadata



Timezone information: When requesting data, the time format is: yyyy-MM-dd'T'HH:mm:ss in Coordinated Universal Time (UTC). Use caution when adjusting to local time (EST vs. DST).

Qualification of Flow Data Collected by GRCA: Sediment accumulation may lead to plugged or partially plugged intakes at monitoring. Best efforts are made to identify plugged intakes and remove this data from the record and tag the period as missing. The data is provided to you in an as is form and may be subject to change. The best available information is provided to you at this time. Float and tapes can stick or malfunction. Best efforts are made to identify these instances and remove this data from the record and tag the period as missing. Full details on the factors that influence accuracy of the real-time monitoring data are listed on the GRCA Provisional Data page.