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53-gallon Oil Spill Reported at The Dalles Dam by Everton Bailey Jr. The Oregonian, June 15, 2018

A turbine generator at The Dalles Dam leaked 53 gallons of oil into the Columbia River, the U.S. Army Corps of Engineers announced Thursday.

The cause of the leak is still under investigation. The leak was first suspected May 31, said Sarah Bennett, a spokeswoman for the Army Corps in Portland. The unit was taken from the river for analysis sometime after and it was confirmed on Thursday to have been spilling oil.

The damaged unit, which generates electricity from running water, will remain out of the water as technicians try to determine what caused the leak, Bennett said.

This is the second reported oil leak at the dam this year. A blade seal that failed caused another unit to leak 470 gallons of oil in March. That unit has since been repaired.