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.
This chart will help you understand the significance of various flows levels. The chart shows the name of the gauge, the affected communities and various flow levels along with the significance of that flow level. Flows are measured in cubic metres per second, i.e. the amount of water flowing past a spot in one second.
|Riverview||0.1||Normal summer low flow|
|Legatt||Grand Valley||0.5||Normal summer low flow|
|60||Water at banks; low-lying areas flooded|
|135||Water over CR25|
|Marsville||Waldemar||0.8||Normal summer low flow|
|65||Water at banks; low-lying areas flooded|
|Shand discharge||Elora||160||Elora boardwalk floods|
|Salem (Irvine R.)||0.3||Normal summer low flow|
|West Montrose||West Montrose||5||Normal summer low flow|
|Up to 180||Warning Zone 1|
|180 - 280||Warning Zone 2; village floods|
|280 - 400||Warning Zone 3|
|400 - 700||Warning Zone 4|
|700 - 1400||Warning Zone 5|