MOUNT VERNON, Wash. — National Guard troops went door-to-door early Friday to evacuate a farming city north of Seattle as severe flooding throughout Western Washington stranded families on rooftops, washed over bridges and ripped homes from their foundations.

Days of torrential rain have swelled rivers to record or near-record levels, with Gov. Bob Ferguson warning that as many as 100,000 people would need to evacuate statewide.

Officials had warned that dikes and levees could fail and issued “go now” orders Wednesday to tens of thousands of residents in the flood plain of the Skagit River, including in the city of Burlington, home to nearly 10,000.

But by Friday morning, the muddy waters began overflowing a slough and rushing into homes, and officials’ pleas became more urgent.

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