Portland's Bureau of Environmental Services warns public to avoid water near SW Macadam Avenue.

About 1,000 gallons of sewage has oozed into the Willamette River, city officials say.

The Portland Bureau of Environmental Services reports that debris blocked a sewer line, causing the overflow at about 2 p.m. on Thursday, Dec. 27.

Workers unclogged the pipe and posted caution signs in the area by about 7 p.m. later that day. The volume of the release is estimated at 1,000 gallons.

"The water is being tested for E-coli levels as a standard procedure," according to a news release. "The public should obey the caution signs in the area and avoid contact with the river near SW Macadam Avenue for 48 hours."

BES says the overflow is not related to the city's overflow control system — often referred to as the Big Pipe project that stopped many combined sewage overflows at a cost of $1.4 billion in 2011.

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