The collision has blocked both lanes in Whatcom County at Slater Road near Bellingham. Washington State Patrol is on scene.

The incident occurred around 3 p.m. Sunday afternoon just south of Whatcom County. It remains under investigation.

All northbound lanes of a stretch of Interstate 5 between San Diego and Del Mar have been closed due to police activity, authorities said Friday.

An illustration shows what a fixed-span replacement Interstate 5 Bridge might look like as it crosses the Columbia River between Hayden Island in Oregon and the state Highway 14 interchange in ...

The wreck blocked the right northbound I-5 lane near Maytown for about an hour, Washington State Patrol Trooper Kameron Watts said.

Three separate collisions have snarled traffic in Whatcom County, according to the Washington State Patrol.

The incident occurred at about 7:29 a.m. and resulted in a miles-long traffic backup, according to the Washington State Department of Transportation.

Up to three lanes in each direction of Interstate 5 will be closed Tuesday through Friday next week.

WSP says a fire truck was hit by a semi-truck after it responded to the scene.

Troopers say a Washington State Patrol vehicle was hit on Interstate 5 while a trooper was outside the car handling a separate crash investigation.

A powerful atmospheric river is hitting the region, delivering several inches of rain, flood watches and landslide risk. Here ...