Northgate Bike/Ped Bridge Project Construction Update July 17, 2020

Daytime bridge span work begins next week over 1st Ave NE (between NE 100th St and NE 103rd St)

From July 20 to August 7, crews will be installing the first set of bridge spans on 1st Ave NE. The spans included in this work make up the portion of the bridge that’s commonly referred to as the “hairpin turn.”

Work hours are from 10 AM to 7 PM. This work will require trucks transporting equipment, two large cranes for erection of support girders, and a single lane closure of 1st Ave NE. Northbound and southbound travel will be maintained.

Northbound I-5 express lane nighttime work

From July 20 to August 9, there will be work in the median near the northbound I-5 express lane off-ramp at 1st Ave NE and NE 103rd St. Work will take place between 11 PM and 5 AM, within the regularly scheduled express lane closure hours. During this time, they’ll be installing a block wall for future truss assembly. Exit 174 NE 130th St/Roosevelt Way NE is the next exit open past the closed express lane off-ramp.

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
• Ongoing concrete work for several pier columns:
  • Placing forms and rebar cages
  • Placing concrete
  • Allowing concrete curing time
  • Removing the forms
• Concrete work for retaining wall and bridge footings

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

• Constructing and pouring leveling pads for concrete block walls
• Installation and backfilling of block walls
• Ongoing concrete work for several pier columns
  • Placing forms and rebar cages
  • Placing concrete
  • Allowing concrete curing time

Northbound I-5 express lane

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 later this summer.

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

Questions during construction? Contact SDOT:

Darrell Bulmer
Communications and Outreach Lead
Northgate Bridge Construction Project
NorthgateBridge@seattle.gov
(206) 905-3620
www.seattle.gov/transportation/NorthgatePedBridge.htm