Skip to Main Content View Text-Only The City of Portland, Oregon Advanced Search /header-stripe City Home Government Bureaus & Offices of the City of Portland Sign In Username or Email Password Remember me Forgot your username or password? Not signed up? Create an Account » Increase Text Size Decrease Text Size Reset Text Size /utility-stripe Environmental Services working for clean rivers Phone: 503-823-7740 Fax: 503-823-6995 1120 SW 5th Avenue, Room 1000 , Portland , OR 97204 More Contact Info Bureau Home What We Do Customer Services Programs Library Library News Sewer Overflows /breadcrumbs Combined Sewer Overflow (CSO) Advisory Sanitary Sewer Overflows (SSOs) /section-nav A CSO event began at 7:50 a.m. on Monday, December 7, 2015 Read More… /promoted View...