Ship Canal Water Quality Project update 6/16/22

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Ship Canal LogoImage of work on Leary Way NW

Crews in Fremont cover the new pipe with soil on Leary Way NW at the end of a shift in mid-May. The soil holds the pipe in place overnight until crews resume work in the morning.


What’s Happening in Fremont?

Other than the Fremont Fair and the Solstice Parade coming up this weekend, what’s going on in Fremont this summer? We recently completed the soil stabilization, utility and restoration work happening on Leary Way NW for the last few months. This means the lane reductions in place since November are done for the foreseeable future! Thank you all for your patience during this work, we really appreciate it.

This summer, we will continue to replace a few sewer pipes and water mains in the right-of-way. There may be temporary lane closures during these phases of work, but nothing like the lane closures during the last several months.

Over the next several weeks we will begin constructing a sewer bypass on 2nd Ave NW so we can start building the diversion structure, sand catcher, and conveyance pipe later this summer. The diversion structure will eventually send untreated sewage and stormwater to the storage tunnel during periods of heavy rain and the sand catcher will allow removal of settleable solids from the conveyance system. The vault will house mechanical, electrical, and odor control equipment. For more information about how this all fits into work happening at our Fremont site, check out our Fremont fact sheet. And as always, be sure to check out our Flickr albums for images from recent construction.

Ballard & MudHoney

MudHoney, our 18-ft diameter tunnel boring machine, recently resumed regular tunneling operations after grinding through a 10-ft boulder.

During regular tunneling activities, you should anticipate:

  • Truck deliveries of concrete segments and MudHoney equipment
  • Nighttime segment deliveries and tunnel spoils being hauled off
  • Noise and vibrations typical of a construction site

Crews are working 24 hours a day, six days a week and will continue until MudHoney reaches Wallingford in early 2023. Sunday work may also occur.

Ground monitoring is ongoing along the tunnel alignment and is done from both inside MudHoney and on the surface.

East Ballard

Crews completed work on the base for the mechanical and electrical vault on NW 45th St, including waterproofing work. This base provides a stable surface to work on. Construction of the reinforced concrete structure will begin this month. Crews are also preparing to construct the diversion structure in 11th Ave NW. Construction of this vault will take up most of 11th Ave NW just south of NW 45th St requiring the road to be reduced to a single, narrow lane. Traffic will be moved to the west side of the roadway.

You should anticipate:

  • One-lane closure on 11th Ave NW mid-June through November 2022. This will allow work to occur in the eastern area of 11th Ave NW near NW 45th St. Flaggers will direct northbound and southbound traffic during daytime working hours, and traffic signals will direct traffic during non-working hours. Directional signage will be in place as well.
  • Heavy equipment in the area
  • NW 45th St remains closed to traffic between 11th Ave NW and 9th Ave NW; vehicles must detour onto NW 46th St
  • Burke-Gilman Trail users remain detoured to the north side of NW 45th St
  • Flaggers will help direct traffic during daytime working hours. Please follow all detour guidance on site. For safety, bicyclists should either dismount or cross train tracks at a 90-degree angle. Please use extra caution in wet weather as ramps may be slippery
  • Noise and vibrations typical of a construction site

Regular work hours will be Monday through Friday, from 7 am to 5 pm. Night and weekend work may occur.


Utility work will begin this week within the site’s east end on 2nd Ave NW. Crews also continue to work on large eight-foot conveyance tunnel pipes underneath white tents within the site from 7 am to 10 pm on weekdays, and possibly 9 am to 10 pm on weekends, over the next few months. 

During this time, you should anticipate:

  • Generators running during work hours to power pumps and equipment
  • Dust and grinding noise, and occasional use of vactor trucks
  • Excavators working on-site for utility installation work
  • Truck traffic on Leary Way NW as trucks bring and remove materials and equipment to and from the site
  • NW 36th St between Leary Way NW and 3rd Ave NW closed (through the remainder of the project)
  • Pedestrian detours on Leary Way NW; please follow all detour guidance on site
  • 2nd Ave NW, between Leary Way NW and NW Canal St, closed to vehicle and pedestrian traffic for sewer and diversion structure work at least through the end of 2022
  • NW Canal St open to two-way traffic to allow access during this closure. Please do not park at the west end of NW Canal St so two-way traffic may turn around at the closure.
  • Noise and vibrations typical of a construction site

Regular work hours will be Monday through Friday, from 7 am to 5 pm. Work on the large pipes inside the tents may occur during nights and weekends as described above.


Crews continue working on the Wallingford shaft walls. Two concrete pours are scheduled for next week for the upper portion of the shaft wall. We’ll be sharing more information with immediate neighbors.

During this time, you should anticipate:

  • Concrete trucks coming in and out of the site
  • Noise and vibrations typical of a construction site

Regular work hours will be Monday through Friday, from 7 am to 5 pm.

Queen Anne

Construction of underground vaults is ongoing through the summer. This work required a slight adjustment to the Ship Canal Trail detour, which has been moved back near its original location for the summer of 2022. Our contractor will be working on both sides of the trail so please continue to remain alert when moving through this area.

During this time, you should anticipate:

  • Trucks coming in and out of the site
  • Noise and vibrations typical of a construction site
  • The West Ewing Mini Park parking lot to remain closed through mid-2023
  • A localized Ship Canal Trail detour at least through summer 2023 (see map). The trail has temporarily been adjusted for construction of the third below-grade vault through summer 2022 and will revert back to the detour shown in the linked map this fall.

Regular work hours will be Monday through Friday, from 7 am to 5 pm. Night and weekend work may occur.

Contact us

Please email with questions or comments or call our hotline at (206) 701-0233. You can also find information online at spushipcanal.participate.onlineTo support the community during active tunneling, we have changed our hotline hours to 24 hours a day, Monday through Friday.

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