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Complications arose Thursday at Springbrook Creek, Monroe Park Tributary in aftermath of July 8 spill

PMG FILE PHOTO: SAM STITES - Residents are advised to stay out of the water at Springbrook Creek and the Monroe Park Tributary due to complications from a sewage leak.

This story has been updated from its original version.

Lake Oswego is advising residents and their pets to avoid contact with water at Springbrook Creek, and now the Monroe Park Tributary as well, following a sewage leak discovered Thursday.

Officials found the leak after testing the waters in the aftermath of a different, unrelated leak that took place nearby on July 8. That original leak near Kruse Way and Boones Ferry Road was caused when a boring contractor hit a line they were unaware of. Upon further investigation, public works crews found that some of the sewer/wastewater that had been released entered a storm drain that flowed into Springbrook Creek, and water samples were taken at several points along the creek to help determine the extent of the release.

Notifications were sent out advising the public to avoid any contact with water in Springbrook Creek and downstream water on Oswego Lake at the mouth of Springbrook Creek (at Springbrook easement) until further notice.

Testing was conducted in the days following the leak, and on July 11 the results from water sampled at the Springbrook easement came back within safe levels, according to the City. The Lake Corporation lifted its water contact restriction, and follow-up sample July 16 showed the water was still within safe levels.

However, City announced Thursday that "current test results came back with higher than expected E. coli bacteria readings — including above the original leak location."

This prompted officials to search for a source of contamination, which was found in the form of a backup caused by a blockage.

"The backup resulted in some wastewater being released into the Monroe Park Tributary, which flows into Springbrook Creek," Citizen Information Specialist Bonnie Hirshberger said in an email. "By 11:45 a.m. on July 18 crews were able to eliminate the blockage and stop the release."

While residents have been told to stay out of the waters at Springbrook Creek and the Monroe Park Tributary, the broader lake area was not impacted by either of the spills according to Hirshberger.

For more information about this sanitary sewer spill, contact Phil Lawrence, Wastewater Superintendent, at 503-534-5677 or This email address is being protected from spambots. You need JavaScript enabled to view it..


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Related stories:

- LO responds to sewage spill at Willamette River, Oswego creek


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