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October 2026
Upcoming traffic impacts in Pioneer Square, SODO, and North Delridge begin as early as October 26
Crews will be working in Pioneer Square, SODO, and North Delridge as early as Monday, October 26, 2026. King County is doing this work to learn about conditions below ground. We will use this information to design facilities to help protect water quality in the Duwamish River and Elliott Bay. At all locations, expect temporary lane closures with at least one lane open for vehicles. Crews will clean sites and reopen lanes once work is complete.
Pioneer Square
 Map of survey locations in Pioneer Square.
- Daytime work will start as early as Monday, October 26, and continue through January 2027.
- Work hours are Monday through Friday, 7:30 a.m. to 5 p.m.
- Work will take place:
- At the intersection of Alaskan Way South and South King Street.
- On South Royal Brougham Way, between Colorado Avenue South and Occidental Avenue South.
What to expect:
- Crews may work at one to three survey locations at a time, for up to three days per location.
- Crews will lift maintenance hole lids and take measurements at each location.
- There will be trucks and cones while crews are working.
- There will be engine noise, hammering, and vibrations while crews are working.
SODO
 Map of survey locations in SODO.
- Daytime work will start as early as Monday, October 26, and continue through January 2027.
- Work hours are Monday through Friday, 7:30 a.m. to 5 p.m.
- Work will take place on:
- Utah Avenue South, between South Lander Street and South Hinds Street.
- 1st Avenue South, between South Horton Street and South Spokane Street.
- Colorado Avenue South, between South Horton Street and South Spokane Street.
- South Hinds Street, between East Marginal Way South and 1st Avenue South.
- South Spokane St, between East Marginal Way South and 1st Avenue South.
What to expect:
- Crews may work at one to three survey locations at a time, for up to three days per location.
- Crews will lift maintenance hole lids and take measurements at each location.
- There will be trucks and cones while crews are working.
- There will be engine noise, hammering, and vibrations while crews are working.
North Delridge
 Map of survey locations in North Delridge.
- Daytime work will start as early as Monday, October 26, and continue through January 2027.
- Work hours are Monday through Friday, 7:30 a.m. to 5 p.m.
- Work will take place on West Marginal Way Southwest, between Chelan Avenue South and Southwest Dakota Street.
What to expect:
- Crews may work at one to three survey locations at a time, for up to three days per location.
- Crews will lift maintenance hole lids and take measurements at each location.
- There will be trucks and cones while crews are working.
- There will be engine noise, hammering, and vibrations while crews are working.
Learn more about the project
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