Translate
Interbay sewer and odor control upgrade
The Interbay Sewer and Odor Control Upgrade Project will replace aging sewer pipes in Seattle’s Interbay neighborhood and add new odor control technology.
Project description
King County plans to upgrade an aging sewer pipe in Seattle’s Interbay neighborhood. The existing pipe was built in 1967 and is nearing the end of its service life. New odor control technology will be added to the system while the sewer pipe upgrade is underway. Major construction is expected to begin in 2024. When complete, the sewer will provide reliable service for another 50 years or more.
Project update
March 20th, 2025
General project updates
As part of ongoing construction near the Interbay Pump Station, crews are finalizing the installation and testing of a temporary 12-inch waterline to carry fresh water. Seattle Public Utilities (SPU) is scheduled to be on-site on March 25th to tie-in the temporary line. The remaining construction work near the pump station is projected to continue through 2025.
Previous project updates
- Construction continues near the Interbay Pump Station in early January, December 2024
- Construction work beginning near the Interbay Pump Station, November 2024
- Road and sidewalk closures: West Armory Way and West Wheeler Street, October 2024
- Temporary above-ground sewer pipe installation begins as early as mid-October, October 2024
- Summer 2024 newsletter now available, August 2024
- Construction activities continue on West Armory Way and West Wheeler Street, August 2024
- Construction activities for Interbay sewer upgrades begin as early as July 10, July 2024
- Major construction now scheduled to begin in mid-2023, April 20, 2022
- Update in West Point Treatment Plan, Capital Improvement Projects Update, October 2021
- Update in West Point Treatment Plan, Capital Improvement Projects Update, June 2021
- October Update, October 2020
- August Update, August 2020
- July email newsletter, July 7, 2020
- June Update, June 23, 2020
Project location
View project area map on the About page.