1120 SW 5th Avenue, Room 1000, Portland, OR 97204
Today the Willamette River through Portland is cleaner than it's been in decades, thanks in large part to ratepayers’ investment in the Big Pipe project that dramatically reduced combined sewer overflows.
With rare exceptions, our stretch of the river is clean enough for swimming, boating and other recreation. How clean? Find out for yourself. Get the latest bacteria and temperature test results.
Stay safe! Keep in mind many factors affect your safety on the river, including temperature, currents and debris in the river as well as your skills and ability in the water. Remember, cold water is healthy for fish, but it can be uncomfortable and even unsafe for people. Know the water, know your abilities, and stay safe while enjoying the river.
Summer weekly testing: Environmental Services collects weekly samples from late May to October to measure for E. coli bacteria and temperature at five popular public entry points. Water samples are collected on Wednesdays and results posted by Friday morning – just in time for the weekend.
Year-round monthly testing: Environmental Services collects water samples monthly at three locations on the Willamette River to track long-term water quality trends.
Results from eight sampling locations
Monitoring river health in Portland
Sampling and analysis
More information about Willamette River water quality in Portland
View data from the U.S. Geological Survey's Willamette River monitoring station at the Morrison Bridge