Updates

Sheet pile installation begins next week

Next week, we will begin installing sheet pile along the waterfront once enough rip rap is removed from the base of the existing seawall. Sheet piles are thin, interlocking steel sheets that act like a retaining wall and protect Elliott Bay from the construction of the new wall. Sheet pile will be installed during daytime hours and noise and vibration may be noticeable.

What you can expect on the central waterfront next week:

Construction

  • Working hours will be seven days next week. Weekday work will occur both day and night, with the noisiest work stopping each day by 10 pm and resuming at 7 am. Weekend work is planned as sheet pile installation gets under way. Ongoing under pier work is dependent on the tides and work hours will vary. 
  • Beginning on Saturday, Seattle City Light will be working in the area just south of the crosswalk at Pike Street and west of Alaskan Way, conducting utility excavation work. We do not anticipate any vehicle impacts. Please follow the direction of flaggers and signage to safely access your destination. If needed, this work will continue on Sunday. 
  • Utility work will occur at Columbia Street next week. This work will occur overnight and traffic will be safely detoured around the work zone. 
  • Under pier utility work along the central waterfront will continue.
  • Continued mobilization of cranes, drills, trucks and other large equipment.
  • Systems to control groundwater are being installed. Once these systems are set-up, generators will be running 24 hours a day. For short intervals, there will be noise and vibration coming from the site as this activity is completed.
  • Removal of rip rap (rocks located along the existing seawall) to install sheet pile.
  • Sheet pile will be installed along the central waterfront. This activity will start on the north side of Pier 57 and head south. Noise and vibration may be noticeable during this activity. Work hours for sheet pile driving are daylight hours, seven days a week.
  • Water treatment facility installation will continue during the day from Pike to Pine streets adjacent to and east of the surface parking lot in this block. Local detours will be in place and steel plates will cover the work area during the day. This work is planned to be complete next week. 
  • Jet grout activities will continue near Waterfront Park. Jet grout is a process by which a concrete mixture is injected into the ground and mixed with existing soils to form a solid foundation. Jet grout prep work, including coring and pre-drilling, have started and will continue next week to prepare for the continued installation of jet grout columns.  

Pedestrian and bicyclists 

  • The multi-use path along the west side of the Alaskan Way Viaduct is now open between Pike and University streets. The path is currently closed from Seneca to Madison streets. The entire length of the path is planned to be open by the end of next week. Please follow the direction of flaggers and signage to safely access your destination.

Vehicles 

  • Utility work at Columbia Street will have temporary overnight impacts to the roadway under the viaduct. Please follow the direction of flaggers and signage.
  • Utility work is planned for Seneca Street and the area just south of Madison Street in the coming weeks. During the day, two lanes of traffic will be maintained. At night, traffic may be reduced to one lane. Please follow the direction of flaggers and signage to safely access your destination. 

What you can expect south of Colman Dock next week:

  • Working hours are six days a week, both day and night, with the noisiest work stopping each day by 10 pm and resuming at 7 am. 
  • Zee panels, large concrete structures in the shape of a “Z” that will support the new wall face and cantilevered sidewalk, are anticipated to be installed this week. This work is dictated by the tides and subject to change.

For questions about Seawall construction, send us an email at seawall@waterfrontseattle.org or call our 24-hour hotline at 206.618.8584.