Lower Grand flows

Learn how to read these charts on our River and stream flows page.
Many timeseries can be downloaded from our Data Downloads page.

Critical flows

**Critical flows table:** 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.
Gauge (Community)	Flow (m³/s)	Significance
Galt (Cambridge)	15	Normal summer low flow
	400	Water at banks; low-lying areas flooded
	638	Water St. closed south of Ainslie
	1,050	Concession St. bridge closed
	1,472	Main St. bridge closed
	1,550	1974 flood
	1,628	Parkhill St. bridge closed
	2,352	Dike capacity
Canning		See Nith River chart
Brantford (Brantford)	20	Normal summer low flow
	400	Water at banks; low-lying areas flooded
	600	Gilkison St. closed
	1,800	1974 flood
	3,400	Dike capacity
Brantford (Caledonia)	400	Water at banks; low-lying areas flooded
	1,040	Caledonia Arena floods
	1,800	1974 flood
Brantford (Six Nations)	555	Fourth Line floods
York (York)	22	Normal summer low flow
York (York)	300	Water at banks; low-lying areas flooded
York (Cayuga)	300	Water at banks; low-lying areas flooded
	300	Campground flooding on Lower Grand
	600	Grand Sports Road floods
	1,800	1974 flood
Dunnville Dam (Dunnville)	300	Water at banks; low-lying areas flooded
	900	Some backyards flooded
	1,800	1974 flood

Location of flow gauges in the Lower Grand River area

Provisional Data

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.

Grand River Conservation Authority
400 Clyde Road, PO Box 729
Cambridge, ON
N1R 5W6
Phone: 519-621-2761
Toll Free: 1-866-900-4722
grca@grandriver.ca