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City News Releases

Posted on: June 22, 2021

King County Breaks Ground on new North Bend Loop Vehicle Maintenance Facility

Loop facility

Earlier this month King County Wastewater Treatment Division (WTD) broke ground on a new Loop Vehicle Maintenance and Staging Facility in the eastern portion of the City.

For the past five years, King County has worked with community members and the City on planning, designing and permit approvals to construct this new facility, located off exit 34 near I-90, on County-owned land.

King County purchased the land in 2014 when it learned the lease for its current Loop Vehicle Maintenance Facility, located in South Seattle, would not be renewed. The North Bend facility will be used by Loop trucks, which currently already stop in North Bend to refuel on their way to commercial farms and forests in eastern Washington.  As such, the facility will not increase truck traffic in the area during operations.

The County anticipates the project will also improve working conditions for Loop drivers and allow it to meet new federal driving regulations for Loop trucks delivering nutrient rich biosolids to farms in Douglas and Yakima counties. Loop biosolids are fully contained and enclosed by the transport vehicle and will not be processed at this site.

Construction of the new facility -  located between 468th Avenue SE, SE 144th Street and SE 146th Street - is expected to take approximately 18 months. Issaquah-based construction fi­rm SeaCon-Bahnmiller JV will be constructing the facility.

Estimated King County Loop Vehicle Maintenance Facility Project Schedule (schedule and dates are subject to change):

  • June 2021: install clearing limit fencing; begin clearing site, install fencing.
  • July 2021: site preparation continues, selective tree removal and disposal of topsoil.
  • August 2021: begin laying sewer lines and storm drains.
  • Fall 2021: begin concrete slabs and foundations and structural work.
  • Winter 2022: install pre-engineered metal erect steel building and metal roof and siding.
  • Spring 2022: begin mechanical, plumbing, HVAC, and electrical.
  • Summer 2022: landscaping and plantings.
  • Fall 2022: project scheduled for completion by November 2022.

For more information on King County’s new Loop Vehicle Maintenance Facility visit

Loop locationFigure 1: King County Loop Vehicle Maintenance Facility location in red.

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