https://www.portland.gov/bes/protecting-rivers-streams/columbia-slough-fish-advisory/health-risks
Fish from the Columbia Slough may contain contaminants such as polychlorinated biphenyls (PCBs), per- and polyfluoroalkyl substances (PFAS), and pesticides...
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https://www.portland.gov/parks/events/2026/1/17/columbia-slough-natural-area-planting-event
Please join Portland Parks & Recreation, Friends of Trees, and POIC Rosemary Anderson High School Natural Resources program to wildflowers and shrubs at the...
columbia sloughnatural areaplantingeventportland