Some of the flow reaches Oswego Lake

Wastewater infrastructure experienced overflow conditions Tuesday on Boones Ferry Road at Oakridge Road and also near the Lake Grove Swim Park on Lakeview Boulevard in Lake Oswego.

Thanks to calls from the public, crews from the Lake Oswego City Maintenance Services Department were able to respond quickly to both problems.

At one location, crews found a downstream manhole (in the middle of Boones Ferry Road) was blocked by a large amount of asphalt (likely from a recent paving project), causing the upstream line to slowly back up until it overflowed. Crews were able to restore flow. The paving contractor is working to remove the full blockage, city officials said.

The cause of blockage near the swim park was likely caused by the surge of flow from the opening of the Boones Ferry line, officials said. The overflow amount was about 300 gallons at the swim park.

As a result of the overflow in Oswego Lake, city officials advised residents in the vicinity to protect themselves, children and pets from direct contact with lake water that may have been subjected to contact with untreated sanitary wastewater for the next 72 hours. If contact with untreated wastewater cannot be avoided, residents are advised to use rubber boots, gloves and other protective wear in good condition.

Neither of the overflow issues were related to capacity constraints of the Oswego Lake Interceptor Sewer, city officials said.

For questions, contact the city public information office at 503-635-0257. For specific questions related to public health concerns, contact the Clackamas County Health Department at 503-655-8478.

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