Heavy rain early Thursday morning caused combined sewage and stormwater to overflow to the Willamette River from three outfall pipes.
Portlands Bureau of Environmental Services reported that the sewage flowed from a pipe on the east bank of the river just north of the Morrison Bridge; another on the west bank of the river at the Burnside Bridge; and a third on the east bank of the river just north of the Fremont Bridge.
The overflows began at around 2 a.m. Thursday, May 23, and lasted for several hours until heavy rain subsided.
The bureau is asking that people avoid contact Willamette River water north of the Morrison Bridge for a couple of days.
About two years ago, the city completed its $1.4 billion Big Pipe project to reduce those types of sewage overflows.