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There will be a 200-foot no wake zone around barges while inspection work is underway.

COURTESY PHOTO: CITY OF LAKE OSWEGO - Advanced American Construction performs underwater inspections using a similar process to what will be used at Oswego Lake. In the coming weeks, Lake Oswegans will likely notice some action on Oswego Lake. But most of that action will be taking place underwater.

Beginning after Labor Day weekend, professionals will undergo a routine inspection of the roughly 10,000-foot sewage pipeline that sits beneath the lake's surface.

James Ellis, the city's project manager, said the general condition of the pipeline will be assessed, "looking to see: How is it aging?" he said. Inspectors will look for signs of corrosion and assess the slope of the pipe.

The inspection falls on the 10-year anniversary of the Lake Oswego interceptor sewer replacement project.

In 2011, the city underwent a large project to replace an aging pipeline that formed "the backbone of the City's sewer collection system," read the city's website.

Ellis said inspections should occur every 10 years, so this is the first time the pipe has been inspected since its installation.

Barges will be loaded into the lake from the marina, while other equipment will be brought into the lake near Allen Road.

Advanced American Construction — the original construction contractor — is part of the inspection team. Divers will leave from barges to inspect different segments of the pipeline.COURTESY PHOTO: CITY OF LAKE OSWEGO - Underwater inspections of the pipeline in Oswego Lake will start after Labor Day weekend and last until winter 2021/2022.

People may notice generator noise during work hours, which will be Monday through Friday. The barges will be on the lake until the work is complete. Work will require cranes and specialized dive teams to inspect the manholes. Because this is the first inspection and assessing the pipeline while the lake is full requires additional work, Ellis said he's not sure how long it will take.

The city encourages people to watch for flags on the boats. This means divers are actively in the water. There is also a 200-foot no wake zone around the barges.

"We're just trying to stress the safety aspect of it," Ellis said. "We want to make sure our team is safe and everyone using the lake will be as well."

Ellis doesn't anticipate they will find anything "exciting," though there are contingency plans in place if the city needs to make repairs.

Work is estimated to be completed this winter.

For more information about this project, visit the city's website.


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