Traffic on I-5 southbound began to back up between Wilsonville and Tigard early Monday morning as eclipse watchers headed south.
The area of totality for the eclipse is south of Aurora.
Drivers stuck in the delay says most of the license plates are from Washington State and British Columbia.
While these eclipse watchers will arrive over the next few hours the bigger concern is after the eclipse. If they decide to return at the same time the traffic jam on I-5 northbound could be much worse.