PORTLAND, Ore. (KOIN) — About 60,000 gallons of combined sewage overflowed into the Willamette River in Portland in a 23-minute period Saturday afternoon, the Portland Bureau of Environmental Services said.
The overflow was caused by heavy rains that fell in the area and came from a single outfall at NW 110th and Front Avenue, officials said. It began at 4:46 p.m. and ended at 5:09 p.m.
People should avoid contact with the Willamette River in the area of Linnton and the Port of Portland Terminal 4 and downstream until late Monday.
This is the first overflow of 2019, authorities said in a release, and was made up of 80% stormwater and 20% sewage. Before the Big Pipe project of 2011, there were on average about 50 outfalls a year.
Both Portland and Troutdale recorded record rainfall amounts for August 10. In Portland, 0.79 inches of rain was recorded, more than doubling the 1957 record of 0.36 inches.
In Troutdale, a record that stood for 54 years — 0.30 inches — was topped when 0.36 inches was recorded.
These are the early reports. A final report from the National Weather Service will be released on Sunday.