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King County Washington home

M Street Trunk rehabilitation

The M Street Trunk Rehabilitation Project will repair about 2.6 miles of deteriorated sewer pipes in the City of Auburn.

Project description

The M Street Trunk Rehabilitation Project will repair approximately 2.6 miles of severely deteriorated 18, 24, 30, and 36-inch-diameter reinforced concrete pipe that has more than 100 side sewer connections to nearby properties. The project will also rehabilitate 45 precast maintenance holes.

Active construction is anticipated to occur during the summer window (May to October) of 2025 to 2026 when the wastewater flow is lower.

The design and construction of the project are divided into two phases with Phase 1 construction scheduled for Summer 2025 and Phase 2 for Summer 2026.

  • Phase 1 construction covers about 0.6 miles of the trunk covering zone 18, zone 24 and some sections of zone 30 starting from the intersection on 14th Street Northeast to south of 22nd Street Northeast.
  • Phase 2 design and construction covers about 2 miles of the trunk covering the remaining portion of Zone 30 and the full length of zone 36.
  • The map that follows displays the zones and year of construction.

Project area displaying 5 zones (work areas) and timeframe: Zone 36 (2026), Zone 30 (2026), Zone 30 (2025 and 2026), Zone 24 (2025) and Zone 18 (2025)

The M Street Trunk pipe serves a densely populated area with many schools, homes, and businesses in the City of Auburn. During construction for the project, there will be impacts to the travelling public including detours, temporary lane closures, and bus stop impacts. Additional impacts may include on-street parking restrictions, and noise and odors from the diversion pumps. This project may include overnight work. We will share more details as plans develop and will keep the community informed.

Project update

April 7, 2026

ADA’s compliant ramps and sidewalk upgrades starting as early as April 13

Beginning as early as Monday, April 13, crews will begin work to demolish the existing curb and ramps to install new American Disability Act (ADA)’s compliant ramps and sidewalks at the intersection of 2nd Street Northeast and N Street Northeast. This work could take approximately two weeks to complete. Please note that this work schedule is dependent on the weather and is subject to change.

As part of the restoration work for the M Street Trunk Rehabilitation project, King County is installing new ADA ramps, sidewalks and curbs to improve safety and accessibility. 

What to expect during this work

  • Work hours are generally weekdays from 7 a.m. to 5 p.m.
  • Construction vehicles and materials may be staged nearby.
  • Flaggers will direct vehicles and pedestrians around the work zone.
  • Street parking will be restricted in posted areas.

Please watch for equipment and signs in the area, travel slowly, and follow directions from flaggers in the work zone.

Learn more

To learn more about the upcoming construction and its impact by work zone, read the latest newsletter.

Visit the online open house for information on the project.

Para obtener más información sobre este proyecto y sobre las próximas obras, visite PublicInput.com/M-Street-Trunk-es o escanee el código.

Чтобы узнать больше об этом проекте, включая информацию о предстоящем строительстве, посетите PublicInput.com/M-Street-Trunk-ru или отсканируйте QR-код.

欲了解更多有关该项目的信息，包括对即将开始的施工的预期，请访问 PublicInput.com/M-Street-Trunk-zh 或扫描二维码。 

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Past project updates

Construction map

The interactive construction map below shows active construction updates where temporary pipes, road, equipment staging and other construction activities will occur for the fall 2025.