The Lake Simcoe Region Conservation Authority advises that a low-pressure system is forecast to move through the watershed beginning Friday, March 13. This weather system is expected to bring up to 10-15 mm of precipitation, with higher amounts of up to 20 mm south of Lake Huron. Temperatures forecast for Friday, March 13 may climb above zero degrees.
Over the past week, above zero temperatures have been experienced by the Lake Simcoe watershed, melting most of the snowpack and increasing flows in area watercourses. Upwards of 40 mm of rain was received yesterday across much of the watershed. Widespread precipitation, warmer temperatures and associated snowmelt coupled with mostly frozen ground conditions have increased water levels and flows in rivers and streams. The rain forecast for Friday March 13 is expected to further increase the current water levels and flows in watercourses.
Flooding has been reported in various low-lying areas of the watershed due to the rainfall received and melting of most of snowpack. Additional flooding, particularly of low-lying areas is possible due to the forecast rainfall.
Ice breakups have been reported in some parts of the watershed due to weakening ice cover, and ice jams remain a possibility, particularly around bridges, culverts and outlets to Lake Simcoe. Wind gusts may hasten ice break-up.
The combination of slippery and unstable banks, higher than normal flows and cold-water temperature will increase already hazardous conditions close to any river, stream or other water bodies, especially in the vicinity of culverts and bridges.
Extreme caution should be exercised around all water bodies. Children and pets should be kept away from all watercourses.
This Flood Watch will be in effect through Tuesday, March 17, 2026, at 10:30 a.m., or until otherwise updated or cancelled. For further information, contact duty officer Kenneth Cheney at 905-895-1281.