GRCA Flood Message #3 – Combined Flood Warning and Flood Watch

The Grand River Conservation Authority (GRCA) is issuing a Flood Warning message for the community of Grand Valley. The previous Flood Warning message for the communities of West Montrose and St. Jacobs and the Flood Watch message for the remainder of the Grand River watershed remain in effect.

Weather forecast

Recent warm temperatures, beginning on Monday March 30, along with thunderstorms and heavy rain have resulted in up to 30 mm of rainfall across the Grand River watershed over the past 24 hours. Current forecasts indicate moderate to heavy precipitation throughout the week, with more rain expected on Tuesday afternoon, including the ongoing risk of thunderstorms. While projected totals vary, most forecasts call for 40 to 50 mm of rain over the next few days.

Flood Warning (Action) Message for Grand Valley

River flows have exceeded flood thresholds in Grand Valley and will continue to affect this area. Municipal flood coordinators in Grand Valley have been advised to monitor conditions and take necessary actions.

Previously Issued Flood Warnings and Flood Watch Remain in Effect

Flood Warning messages for Communities of West Montrose and St Jacobs and the Flood Watch message for the remainder of the Grand River watershed remain in effect.

Flood Warning (Action) Message for West Montrose

River flows are expected to reach Flood Warning Zone 1 in West Montrose in the afternoon on Tuesday, March 31. Municipal flood coordinators in the Township of Woolwich have been advised to notify affected properties and monitor conditions. Residents are encouraged to refer to the guide on the GRCA’s website for information regarding flood warning zones.

Flood Warning (Action) Message for St. Jacobs

River flows have resulted in flooding of low-lying areas in St. Jacobs and may continue to affect this area into Wednesday, April 1. Municipal flood coordinators in the Township of Woolwich have been advised to take necessary actions.

GRCA Reservoirs

GRCA reservoirs are being used to help reduce the impact of downstream flooding.

Public safety

High flows and unstable ice conditions will increase the safety risk around rivers and streams throughout the watershed. The public is encouraged to exercise extreme caution around local waterways. Families are reminded to keep children and pets away from watercourses. The public is reminded to stay off ice-covered waterbodies, due to unsafe conditions.

River conditions and forecasts are being monitored closely, and any additional flood messages will be issued as needed.

This message will remain in effect until 12 p.m. on Tuesday, April 7, 2026. 

More information

• For more information on flows, weather and reservoir conditions see the River Data section of the GRCA website.
• More information on the flood warning system is available on the GRCA website.
• Receive GRCA flood messages by e-mail by subscribing through the GRCA website.
• Follow GRCA flood messages on X at grca_flood_msg.
• More information about how the GRCA’s role in managing floods is available in the Flooding section of the website.
• Copies of the GRCA’s River Safety Rules booklet is available by contacting the GRCA Administration Centre

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Media contacts:

Lisa Stocco, GRCA Director of Strategic Communications and Environmental Education

Phone 519-621-2763 x2316 | Email lstocco@grandriver.ca

Serena Catania, GRCA Supervisor of Communications and Marketing

Phone 519-621-2763 x2240 | Email scatania@grandriver.ca