PORTLAND, Ore. (AP) - Rains, melting snow runoff and high tides combined to close U.S. 101 at Tillamook and restrict traffic at Seaside Thursday, but the drenching Western Oregon has taken in recent days seemed to be easing off.

Flood warnings for parts of Union County in the east were posted Thursday. Some valley flooding was reported in the Union, Elgin and La Grande areas.

Adam Torgerson, northwest Oregon spokesman for the Oregon Department of Transportation, said U.S. 101 south of Seaside was open only to high-center and emergency vehicles while it was closed at Tillamook, but that a short detour was open.

The flood warning in Union County was in effect into Friday afternoon. Flash flooding was considered unlikely.

Partly cloudy weather was expected over much of Oregon through Monday.

Oregon had braced for much worse flooding, especially in the Nehalem area on the north coast.

But Washington took the brunt of the storm. Floods, mudslides and avalanches stopped trains and kept thousands of people in their homes.

A 20-mile stretch of Interstate 5 was shut down between Olympia and the Oregon line, with one section under 3 feet of water.

Truckers pulled onto highway shoulders or crowded truck stops parking lots, bottling up nearly all freight headed to or from Northwest ports.

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 Washington state Division of Emergency Management. "We just haven't seen this extent of flooding."

Because of the closed highways, a truck traveling from Portland to Seattle, normally about 175 miles, needed a 440-mile detour. Ten thousand trucks travel I-5 each day.

None of the 60 or so freight and passenger trains that usually travel between Portland and Seattle each day was moving. Some freight was being rerouted.

(Copyright 2009 by The Associated Press. All Rights Reserved.)