  On the left is an image of the Global Positioning System (GPS) unit at our shaft site in Wallingford. We have the same system at all our shaft sites. In the middle is a survey point typically seen in roads and other flat surfaces that can be accessed by surveyors. On the right is a reflective target, typically used for walls or locations that are hard to access.
All of these systems help us monitor ground movement during active construction.
Ground monitoring is a standard practice in tunneling, even when we don’t expect our tunneling activities to cause ground movement. We’ve implemented a robust system of monitors including survey points and automated equipment (such as the GPS unit pictured above). These monitors will alert crews of any unexpected changes at the ground surface caused by MudHoney deep below ground. See if you can spot any surface monitors around your neighborhood!
To learn more, check out the ground monitoring factsheet. We also encourage you to look at our latest construction photos on Flickr to see the progress that has been made.
Ballard & MudHoney
MudHoney, the 18-ft storage tunnel boring machine (TBM), has tunneled approximately 400 feet. Keep an eye on our tunneling tracker for progress!
During tunneling, you should anticipate:
- Heavy equipment, such as cranes, being installed on site
- Truck deliveries of MudHoney equipment
- Tunneling activities
- Nighttime truck traffic including concrete segment deliveries and removal of tunnel spoils (dirt taken out of the tunnel)
- 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 reaches Wallingford in fall 2022. Weekend work may also occur.
Ground monitoring is ongoing along the tunnel alignment and 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 in NW 45th St.
During this time, you should anticipate:
- In October, a few periods of night work, which will include closures at or west of the intersection on NW 45th St. and 11th Ave NW.
- The final connections for the water main bypass will require a short, temporary water outage. If your service will be impacted, you'll receive a door hanger with more information.
- 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. As soon as mid-October, crews will also continue intermittent work in Leary Way NW on a new water main. This work will require some lane closures on Leary Way NW.
During this time, you should anticipate:
- An increase in truck traffic on Leary Way NW as dump trucks haul away spoils from tunneling
- Excavators working on site for utility installation work
- Truck traffic on Leary Way NW as trucks bring materials to the site
- NW 36th St between Leary Way NW and 3rd Ave NW closed (through remainder of the project)
- Pedestrians detoured to the north side of Leary Way NW
- Generator running during work hours to power the TBM and associated 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
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 are preparing 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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