Tomorrow is the Portland Marathon and there are a ton of road closures, including:
BRIDGES
St. Johns: Bridge Ave. (South side of bridge) from Hwy 30 to the bridge CLOSED to ALL vehicular, bicycle and pedestrian traffic from 7am-1:30pm. One lane each direction on the bridge will remain OPEN to traffic. Bridge access will be from North side Germantown Rd ramp.
Plan accordingly.
http://www.portlandmarathon.org/marathon_traffic.php