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Overnight work scheduled for King County sewer upgrade project in Bellevue


King County sewer utility crews are scheduled to work up to 24 hours straight on a time-sensitive project to install a new 1,600-foot sewer pipeline beneath a section of Southeast 38th Street in Bellevue. The installation is weather-dependent and expected to begin on March 16.


Upgrades to King County’s Sunset and Heathfield pump stations in Bellevue will require sewer utility crews to work around-the-clock to complete a time-sensitive pipeline installation project. The work is scheduled to begin March 16.

Crews will install the new pipe using horizontal directional drilling, a trenchless construction method typically used to install pipelines under busy roadways and environmentally sensitive areas such as wetlands and streams. The assembled pipe is currently staged in Lake Sammamish near Vasa Park.

After a machine drills an underground pathway, crews pull a new pipeline through it. The installation method requires crews to work without stopping and takes an estimated 16 to 24 hours to complete. 

The new 1,600-foot pipeline is part of King County’s Sunset and Heathfield Pump Station and Force Main Upgrade project to replace aging and undersized sewer infrastructure, and ensure reliable service for the growing community. 

Project neighbors may experience a temporary increase in noise and vibration from the construction equipment, as well as intermittent single-lane closures along Southeast 38th Street and West Lake Sammamish Parkway Southeast. Boaters are advised to avoid the water side area of Vasa Park and use extreme caution during all pipe straightening and pullback activities.

People with questions or concerns can call the project’s 24-hour construction hotline at 206-296-7800.