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 2027 when the wastewater flow is lower.

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
March 2025
Construction starting Summer 2025
We are excited to announce that construction for the M Street Trunk Rehabilitation Project anticipated to start in the summer of 2025. The construction schedule is organized in zones based on the different pipe diameters along the M Street Trunk. Read our latest update to learn more.
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Past project updates
- Construction starting Summer 2025, March 2025
- Surveying work starts December 16 continuing through December 20, 2024, December 11, 2024
- Soil surveying work starts November 18, 2024, November 2024
- Utility investigation work starts on October 28 continuing through November 8, October 2024
- Survey work for M Street Trunk Rehabilitation Project begins July 2, July 1, 2024
- Survey work for M Street Trunk Rehabilitation Project begins June 25, June 25, 2024
- New King County project coming to your neighborhood, Winter 2024