Update at 4:45 p.m.: The driver was airlifted with Harborview Medical Center with critical injuries, according to the Washington State Patrol.
One lane of Highway 530 will be open to alternate traffic around 5 p.m.
Original post: A driver was injured after a tree fell on a semi-truck on state Highway 530 near Oso on Thursday afternoon.
The driver is still trapped in the truck, the Washington State Patrol said. His or her injuries may be critical.
Highway 530, just west of 310th Street Northeast, is blocked in both directions, according to the state Department of Transportation.
This post will be updated.