Mudslides, Floods Swamp Washington

Floods, mudslides and avalanches in the Pacific Northwest kept tens of thousands of people from their homes and stranded hundreds of trucks along the major highways that link Seattle's busy ports with markets around the country.

The flooding - some of the worst on record in Washington state - was touched off by a combination of heavy rain of 6 inches or more and a warm spell in the mid-40s that rapidly melted snow in the Cascade Mountains.

A state of emergency has been declared in nearly two dozen counties, reports CBS News correspondent John Blackstone.

A 20-mile stretch of Interstate 5, the state's major north-south freeway, was shut down between Olympia and the Oregon line, with one section under 3 feet of water. Avalanches closed Interstate 90, which cuts east from Seattle through the Cascades, along with the two other routes through the mountains. On Thursday, highway crews reopened one of those cross-state routes, U.S. Highway 2 across Stevens Pass.

Amtrak service and some freight trains were stopped as well.

Hundreds of truckers pulled their rigs off onto highway shoulders or packed truck stops as the bad weather bottled up nearly all freight in and around Seattle, costing the economy untold millions of dollars of day.

More than 30,000 people in western Washington were urged to evacuate their homes on Wednesday in low-lying areas from Bellingham near the Canadian border to the Kelso area near the Oregon line as rivers spilled over their banks and flooded some neighborhoods.

The stricken areas included such far-flung Seattle bedroom communities as Fife, Orting and Snohomish, but Seattle itself saw little flooding.

By Thursday afternoon, Orting officials told residents they could return to their homes.

Rescuers had used boats to evacuate scores of people from nursing homes. Fire trucks rolled through the streets, using loudspeakers to warn people to leave.

No serious injuries were reported.

"I think we're seeing an all-timer, or as bad as anyone has seen," said Rob Harper, a spokesman for the state Division of Emergency Management. "We just haven't seen this extent of flooding."

Most of the flooding rivers in Western Washington had crested by late Thursday and begun to fall, although major flooding continued on the Snohomish at the town of Snohomish, the Snoqualmie at Carnation in the Snoqualmie Valley and the Chehalis and Skookumchuck near Centralia, along I-5.

State Transportation Secretary Paula Hammond estimated the economic effect of just the I-5 shutdown at $4 million a day. A major storm 13 months ago closed the same stretch for four days.

Crews struggled to reopen highways, especially those leading to communities cut off by the flooding and avalanches.

In Orting, a town near Mount Rainier, Jamie Hicks used five pumps to try to clear the 2½ feet of water from his house, about 50 yards from the swollen Puyallup River.

"We're veterans at this," Hicks said as his son rowed a boat in front of the house. "You just pump it out."

In Snohomish, about 30 miles north of Seattle, a crowd watched as Robert Bishop and his roommates were rescued by boat from their two-story duplex. The home close to the Pilchuck River was nearly half underwater.

"I thought it was fine, but it went higher than I thought," said Bishop, 48, who waited out previous floods. "It was very scary."

Because of the closed highways, a truck traveling north from Portland, Ore., to Seattle - normally a journey of about 175 miles - would need to take a lengthy detour. Ten thousand trucks travel I-5 each day, and an additional 7,000 move freight across the Cascades.

A spokesman for the Port of Seattle said it was too early to gauge the cost of the storm. In 2008, the port took in 1.7 million 20-foot containers from China, Japan, South Korea and elsewhere. Most of that freight leaves the port by rail.

No freight or passenger trains were moving between Seattle and Portland, but trains were making it across the Cascade Range. About 60 trains travel daily between Portland and Seattle carrying freight and passengers, said Gus Melonas, a spokesman for Burlington Northern Santa Fe.

Some of the north-south freight was being rerouted through eastern Washington until tracks can reopen, Melonas said.