Update for 1:54 p.m.
WSDOT reports all northbound lanes of SR 599 are now open.

Update for 1:11 p.m.
A front end loader is currently pushing the semi trailer over, traffic should resume shortly.

Original post
A semi-truck rolled over on northbound SR 599 near S. 133rd and the Metro Bus Barn around 11:30 a.m. on Oct. 26.

Both northbound lanes are shut down as of 12:30 p.m., according to the Washington Dept. of Transportation.

The ramp from NB I-5 to SR 599 is currently closed as well. Drivers stuck on the 599 are currently using the Interurban on-ramp to exit the backup, according to WSDOT.

We’ll keep you posted as the situation develops.