  Jet grout rig forming a column to stabilize the ground at the East Ballard site
Any new built structures need to have solid ground to live on. Jet grouting, one of many effective ways to stabilize soil, has been used on many large projects around the city, like the Seawall project on the Seattle waterfront. Earlier this year, we used jet grouting to strengthen the soil at our East Ballard site on NW 45th St. Over the next few months, we’ll be jet grouting at Fremont to prepare the soil for tunnel construction.
Jet grouting uses pressure, water, and a slurry substance known as soil-cement or grout, to create columns that form stabilized panels or blocks underground. Crews start by drilling deep holes into the soil, then they inject grout at high pressure into the hole replacing the soil with grout which hardens into columns. This produces a strong, non-toxic block of ground that is quieter and creates less vibration than other soil stabilization techniques.
Check out our latest construction photos on Flickr.
Intermittent lane reductions on Leary Way NW starting Nov. 1 through approximately Feb. 2022
While jet grouting does use a smaller footprint than other methods, we will need to close some traffic lanes on Leary Way NW for a few months starting in November. Two lanes will always remain open (one lane in each direction), and when work is not taking place, we will leave all lanes open when possible. Access to all businesses will be maintained. If you are commuting through this area, consider taking our optional detour during this work.
 Map showing lane reductions on Leary Way NW and optional detour route
Ballard & MudHoney
MudHoney, the 18-ft diameter storage tunnel boring machine (TBM), has tunneled approximately 880 feet. MudHoney has reached a planned pause to switch from the conveyor belt system of removing spoils to the rail system (see previous listserv for more information) and for trailing gear installation.
During this time, you should anticipate:
- The tunnel boring machine will be stopped for a few weeks
- Heavy equipment, such as cranes, being installed on site
- Truck deliveries of MudHoney equipment
- Noise and vibrations typical of a construction site
Crews are working 24 hours a day, 5 days a week, and will continue until the tunnel boring machine reaches Wallingford in fall 2022. Weekend 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
Through the end of the year, crews are installing a temporary water main, dewatering equipment, and excavation support for the mechanical and electrical vault on NW 45th St.
During this time, you should anticipate:
- A few periods of night work, which will include closures at or west of the intersection on NW 45th St and 11th Ave NW
- Two separate, short, temporary water outages will be necessary to complete the water main bypass. The first outage could occur as soon as next week. The second outage is expected to follow about a week later. If your service will be impacted, you'll receive a door hanger with more information about 5 days prior to the outage.
- Heavy equipment in the area
- NW 45th St closed to traffic; 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.
Fremont
Work on the 8-ft conveyance tunnel continues. Crews will start jet grouting work in Leary Way NW with longer term lane reductions on Leary Way NW and an optional detour (see map and additional information above).
A temporary watermain will be installed on 2nd Ave NW to allow space for crews to build underground structures, this will involve some work on the existing water pipes in Leary Way NW.
During this time, you should anticipate:
- Lane reductions on Leary Way NW starting as early as Nov. 1 and lasting through approximately Feb. 2022
- Large equipment on Leary Way NW to support jet grouting work
- Excavators working on site for utility installation work
- Truck traffic on Leary Way NW as trucks bring and remove materials to and from the site
- NW 36th St between Leary Way NW and 3rd Ave NW closed (through remainder of the project)
- Pedestrian detours on Leary Way NW, please follow all detour guidance on site
- Generator running during work hours to power equipment
- 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 the year
- NW Canal St is open to two-way traffic to allow access during this closure. Please do not park at the west end of NW Canal St to allow two-way traffic to turn around at the closure.
- Noise and vibrations typical of a construction site
The water main bypass work will likely happen in mid-November. This will require a short, temporary water outage. If your service will be impacted, you’ll receive a door hanger with more information.
Regular work hours will be Monday through Friday, from 7 am to 5 pm. Night and weekend work may occur.
Wallingford
Crews continue working on the shaft liner wall.
During this work, you should anticipate:
- Trucks coming in and out of the site to deliver reinforcing steel and concrete
- Noise and vibrations typical of a construction site
Regular work hours will be Monday through Friday, from 7 am to 5 pm.
Queen Anne
Crews have started to install temporary shoring for construction of the diversion structures.
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 through summer 2022 (see map)
Regular work hours will be Monday through Friday, from 7 am to 5 pm. Night and weekend work may occur.
Contact us
Please email SPU_ShipCanalProject@seattle.gov with questions or comments or call our hotline at (206) 701-0233. You can also find information online at spushipcanal.participate.online/.To support the community during active tunneling, we have changed our hotline hours to 24 hours a day, Monday through Friday.
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