CALGARY, Alberta (AP) — As many as 100,000 people could be forced from their homes by heavy flooding in western Canada, Calgary city officials said, while mudslides forced the closure of the Trans-Canada Highway, isolating the mountain resort towns of Banff and Canmore.

Torrential rains and widespread flooding throughout southern Alberta on Thursday washed out roads and bridges, left at least one person missing and caused cars, couches and refrigerators to float away. Communities were hit hard just south of Calgary, a city of more than a million people that hosted the 1988 Winter Olympics.

Many downtown neighborhoods were ordered evacuated as the evening went on. Officials said the evacuation would take place in stages over the next few days. The province reported that 12 communities were under states of emergency.

Water levels were expected to reach their maximum around noon today.

One woman who had been stranded on top of a trailer was missing after it was swept away, STARS air ambulance spokesman Cam Heke said.

Motorists who were trapped overnight Wednesday by water spilling over Canada’s main western highway had to be rescued by helicopter, town of Canmore spokeswoman Sally Caudill said.

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