Ottawa is sending hundreds of air force personnel to aid the recovery and "there are thousands more on standby," Trudeau told reporters in Washington ahead of a U.S.-Canada-Mexico summit on Thursday.
The death toll from massive floods and landslides that devastated parts of British Columbia is set to rise, with the Canadian province declaring a state of emergency on Wednesday and the federal government promising major help.
Authorities have confirmed one death after torrential rains and mudslides destroyed roads and left several mountain towns isolated. At least three people are missing. Some 18,000 people are displaced in the Pacific Coast province, Canadian Public Safety Minister Marco Mendicino said.
The flooding is the second weather-related calamity to hit British Columbia in the past few months. A massive wildfire in the same region as some of the devastation destroyed an entire town in late June.
"For those who understand and recognize that these events are increasing in regularity because of the effects of human caused climate change, there is hope in terms of the roadmap to 2030 that we've developed here in British Columbia," said British Columbia Premier John Horgan.
The disaster could be one of the most expensive in Canadian history.