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Concern about mudslides along rail tracks prompted Amtrak to decide to bus passengers between Seattle and Everett on Wednesday and Thursday, Seattle station agent Harry Patterson said. Travelers on Amtrak's Empire Builder to Chicago were affected. Passengers on trains linking Seattle and Bellingham and Seattle and Vancouver, British Columbia, were bused the entire way, he said.

Freight train traffic was not affected, said Gus Melonas, a spokesman for Burlington Northern Sante Fe, which owns the tracks.

PASS PICTURESSlideshow: The Scene At Snoqualmie

Heavy snow and numerous accidents prompted highway officials to close Interstate 90 over Snoqualmie Pass briefly Wednesday evening.

Flood warnings were in effect for the Stillaguamish, Skokomish, Snohomish, Skagit, Nooksack and Snoqualmie rivers, whose high waters were affecting mostly rural areas and low-lying roads. Most were expected to return to their channels Thursday as the rain tapered off.

Rains forced the closure of numerous roads in northwest Washington's Whatcom County, said Don Boyd of Whatcom County's Division of Emergency Management.

The Skokomish River slipped its banks Tuesday in Mason County, forcing closure of several low-lying roads.

Three rockslides on the North Cascades Highway -- one east of the tiny town of Diablo and two to the west -- have cut off the town. Snow and fog has kept crews from working to clear the slides on State Route 20, state Transportation Department spokeswoman Jamie Holter said.

"We're just waiting on the weather" to begin work, Holter said.