Police are warning drivers to expect traffic delays in Portland, Oregon, due to a semi truck that overturned on Monday afternoon.

The incident happened around 11 a.m., on the northbound Interstate 5 ramp to Interstate 405.

According to OregonLive.com, traffic is currently being rerouted to the Marquan Bridge.

One lane on the southbound Interstate 5 ramp is currently open. Police are investigating the cause of the crash.

The driver was not seriously injured.

Update (1:00 p.m.): One lane has reopened on northbound Interstate 5.