Conestogo River flows | Grand River Conservation Authority

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

Brochure

Drayton: Preparing for Flooding - Published by the GRCA in co-operation with the Township of Mapleton and the OPP.

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
Upper Drayton/Drayton	0.1	Normal summer low flow
	125	Water at banks; low-lying areas flooded
	125 - 200	Warning Zone 1
	290	Flooding behind Wood St. homes
	200 - 300	Warning Zone 2
	370	Water crosses Wood St.
	300 - 400	Warning Zone 3
	388	1974 flood
	450	Water crosses Main St.
	400 - 800	Warning Zone 4
Glen Allan	3	Normal summer low flow
Glen Allan	50	Water at banks; low-lying areas flooded
St. Jacobs	4	Normal summer low flow
	35	Twp. Rd. 21 (Three Bridges Rd.) low-level bridge flooded
	150	Water at banks; low-lying areas flooded
	595	1974 flood

Location of flow gauges in the Conestogo River

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.