(Portland, OR) -- Cleanup is underway after raw sewage spilled under the west end of the Burnside Bridge Monday morning. The sewage covered a sidewalk and flowed into a storm drain into the Willamette River. The spill was caused by a problem with a pressurized pipe from a pump station. The pump was turned off while repairs are made. City crews roped off the area while the sidewalk was cleaned. They're advising people to stay out of the Willamette River around the Burnside Bridge through Wednesday.