Moderate flooding is possible along that stretch of the river, according to the National Weather Service in Seattle, which issued the warning.
The Snohomish River was nearing flood stage at 5:30 p.m. Sunday, the warning said. The water level was forecast to crest just above flood stage at 4 a.m. Monday and begin to recede.
Low-lying roads, especially those not protected by levees, are susceptible to flooding, according to the warning. A section of the Old Snohomish-Monroe Road near French Creek was closed to traffic early Sunday evening, said Bruce Keaton, a battalion chief with Snohomish County Fire District No. 4.
Drivers are urged not to drive through standing water, as this is the leading cause of flood-related deaths in the state, according to the weather service warning.
About three inches of rain fell in the Cascades late Saturday into Sunday and as much as two inches fell in lowlands, according to the weather service.
Earlier flood warnings for the Skykomish River near Gold Bar and the Stillaguamish River near Arlington were ended Sunday afternoon after those rivers began to recede.
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