Northgate Pedestrian/Bike Bridge Construction Update – May 2020

The following activities will be taking place over the next several weeks during construction of the Northgate Pedestrian/Bike Bridge:

Northbound I-5 express lane  (nighttime work continues until early June)

Work on the I-5 median, near the northbound I-5 express lane off-ramp at 1st Ave NE and NE 103rd St, will continue this month and into early June.

Nighttime work will take place between 9 PM and 5 AM, starting and ending 2 hours earlier than the regularly scheduled express lane closure hours . During this time, crews will install an underground drilled shaft (see photo of shaft rebar cage below) and will conduct quality assurance testing following construction.

• Alternate route: Exit 174, NE 130th St/Roosevelt Way NE (one next exit past the closed express lane off-ramp at NE 103rd St)

West side of I-5 (north side of North Seattle College and along N 100th St)

• Installation of underground drilled shaft structures
• Quality assurance testing of bridge drilled shaft structures
• Structural excavation work
• Preparation of bridge shaft tops for column installation
• Concrete work on the abutment wall structure:
  • Placing forms and rebar cages (see photo above)
  • Placing concrete
  • Allowing concrete curing time
  • Removing the forms

East side of I-5 (1st Ave NE between NE 100th St and NE 103rd St)

• Ongoing intermittent lane closures between 7 AM and 3:30 PM, with northbound and southbound traffic maintained
• Sidewalk demolition
• Structural excavation
• Preparation of bridge shaft tops for column installation
• Retaining wall construction
• Quality assurance testing of bridge drilled shaft structures
• Ongoing concrete work for several pier columns:
  • Placing forms and rebar cages
  • Placing concrete
  • Allowing concrete curing time
  • Removing the forms

What to expect during construction

• Some noise and construction vehicle activity, including cranes
• Some nighttime and weekend work
• Detours for people walking and biking
• Lane reductions on Northgate express lane on- and off-ramp
• 2 freeway closures and detours (on weekends and at night only)
• Construction staging and parking impacts near the construction sites, including at the northern side of North Seattle College along N 100th St and on NE 100th St at 1st Ave NE
• Closure of the North Seattle Park & Ride on 1st Ave NE