All lanes of southbound Interstate 5 are blocked due to a serious crash at West Street in Chehalis. According to the Washington State Patrol, the accident involved a semi-truck and occurred at milepost 78.

Crews are working to clear debris from the roadway, but there is no estimated time for reopening the highway. Southbound I-5 traffic is being detoured onto Chamber Way.

Drivers should expect long delays, use an alternate route or delay travel.