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North Creek Interceptor

Completed – Spring 2019

Project description

The County has completed repairs and replacement of a 2-mile pipeline that has been serving the Bothell area since 1970. The new pipeline will increase system reliability and capacity to accommodate population and business growth in this portion of the service area.

Since early 2018 the new pipe has been carrying wastewater flows and providing increased system capacity and reliability. The new pipe was installed using both trenchless and open cut construction methods.

The map, below, shows the different work areas and construction methods for the project.


King County began work on this project in early 2015. Installation of the new pipeline was completed in early 2018. Final street paving in the Canyon Park Business Center was done this summer and final striping is scheduled to be completed by the end of the year. These areas will be monitored through 2023 to ensure the restoration was successful.