New evacuations were ordered in Pierrefonds, on the northwestern shore of the Island of Montreal, after three temporary dikes ruptured, sending water levels higher.
A combination of torrential rains and runoff from melting snow has caused rivers to overflow their banks from Ottawa to Montreal, posing critical challenges for people already stressed and exhausted by the seemingly endless rainfall.
More than 1,000 people have been evacuated in Quebec province, the largest number coming from Gatineau, near Ottawa, said a statement today from the province's emergency response unit.
The worst is yet to come, Quebec Premier Philippe Couillard warned yesterday.
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"The water will continue rising over the next two or three days," he said after visiting the town of Rigaud, east of Montreal, which has been flooded for more than a week.
Water levels continued to rise across much of an area of some 500 kilometers, from Toronto and Lake Ontario and stretching downstream along the St. Lawrence River.
The Ministry of Public Safety said waters were expected to crest sometime tomorrow in Quebec province, where flooding has been especially bad.
"Our troops are responding quickly and professionally and are already beginning to deliver critical support to Canadians affected by the flooding," Defense Minister Harjit Sajjan said.
Emergency services warned that rising waters would reach regions east of Montreal, where precipitation by tonight could reach 3.5 to 5 inches.
"The ground, already near saturation, has little ability to absorb further rainfall," Environment Canada said in a weather alert for the region.
"Even shallow, fast-moving water across a road can sweep a vehicle or a person away. Don't approach washouts near rivers, creeks and culverts. Consider moving valuable items to higher levels."
"I understand people are reluctant to leave their homes," Couillard said, "but if you're asked, do it for your own safety."
Meanwhile, in British Columbia on the opposite side of the country, the same combination of rain and snow melt has caused flooding and mudslides that left at least two people missing, media reports said.
Residents of several dozen homes were ordered to move to safety.