( CNN ) -- The U.S. Army Corps of Engineers offered support Monday to state and local officials in western Washington battling fast-moving floodwaters and rising rivers . Six teams , including 39 flood fighters , were sent to the Olympic Peninsula and the Chehalis , Nooksack , Skagit , Snohomish and Puyallup river basins to monitor areas of concern and provide real-time river condition observations to the local and federal emergency operations centers , officials said . The Corps also supplied two pumps to the city of Orting at its request and 15,000 sandbags to Snohomish County . Monday morning , the National Weather Service was reporting major flooding on the Snoqualmie River at Carnation and moderate flooding on the Snohomish River at Snohomish . Flooding also was occurring or was predicted for areas along the Green , Nooksack , Skagit , Skokomish and Chehalis rivers , according to the weather service 's Advanced Hydrologic Prediction Service . The Stillaguamish River , which Sunday evening rose to a record level at Arlington , had receded below flood stage Monday morning and will continue to drop , the prediction service said . The rain that led to the flooding also triggered mudslides that shut down passenger trains north and south of Seattle over the weekend . About 300 people are staying in shelters after homes flooded in several cities north of Seattle , said Rob Harper an emergency management spokesman for Washington . He said they evacuated voluntarily . `` Swift-water teams were called out Sunday , '' Harper said . `` Rescue operations are still being mobilized to be available if needed . '' Rivers in nine counties had crested at or above flood stage by Sunday morning , the state Emergency Operations Center reported . And a mudslide north of Vancouver , Washington , just across the state line from Portland , Oregon , shut down Amtrak 's Cascades train route until Tuesday morning , Amtrak said . `` They have to make sure where the mudslide occurred or anywhere else along that track , that the slope is stable enough to where there will not be any chances of an additional mudslide occurring before they release passenger traffic back onto the track , '' said Washington Department of Transportation spokeswoman Vickie Sheehan . Mudslides occurred north of Seattle as well , shutting down train service that connected the city to Canada , Sheehan said . But shutting down the Portland-to-Seattle run has `` a much bigger impact that affects a lot more people , '' she said . Amtrak will provide bus service for all ticketed passengers throughout the weekend and until the rail line reopens , Amtrak spokeswoman Vernae Graham said . CNN 's Antoinette Campbell , Jessica Jordan , Shelby Lin Erdman , Leslie Tripp and Greg Morrison contributed to this report .
NEW : U.S. Army Corps of Engineers sends six flood flight teams to Washington state . The corps is also sending a team from the National Guard and Coast Guard. Flooding reported on several rivers , with some still rising . Nine counties report flooding , Washington state says .