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2013-2014 Arterial Paving Projects: N 105th, N/NE Northgate Way Improvement Project

Updated 04/10/14

Project Update

The eastbound travel lanes of N Northgate Way between Aurora Avenue N and Meridian Avenue N were closed to traffic at the beginning of March, and westbound traffic reduced to a single lane.  Crews have begun to install new storm drainage structures and new concrete roadway, curbs, gutters, and sidewalks.  The eastbound traffic closure and westbound lane reduction are expected to remain in place for approximately four more months.


During this phase, motorists will be detoured at Aurora Avenue N.  (See detour map below.)

  • General purpose through traffic:  North on Aurora Avenue N to N 115th Street or south on Aurora Avenue N to N 85th Street.
  • General purpose local traffic to nearby destinations, such as North Seattle Community College & Northgate Mall:  South on Aurora Avenue N to N 90th Street, north on Wallingford Avenue N, east on N 92nd Street, then north along College Way N/N Meridian Avenue N.
  • Truck traffic:  North on Aurora Avenue N to N 145th Street

Night Construction

Crews will be working one or two nights each week into July, or approximately 20 weeknights during this period.  The work does include the use of concrete saw cutters.

Why is concrete saw cutting sometimes done at night?  After a concrete roadway panel is poured, and at a certain point in the cure process, joints need to be cut across the panel in order to prevent cracking.  The timing of making these cuts is variable and depends on factors such as temperature and humidity.  While every attempt is made to conduct concrete saw cutting during normal daytime work hours, at times the work must be done late at night or early in the morning. 


N 105th Drainage installation

Project Overview

The Seattle Department of Transportation (SDOT) is making improvements along N 105th Street and N/NE Northgate Way from Greenwood Avenue North to Lake City Way Northeast.  Construction began last July and is currently projected to be completed in late summer 2014.

Improvements include complete roadway repaving, new sidewalks and curb ramps, drainage improvements, street lighting and street trees from Greenwood Avenue North to Corliss Avenue North.  SDOT will also upgrade traffic signals from Greenwood to Lake City Way (and along Lake City Way to North 102th Street). 

The paving element of the project, the most disruptive to motorists, has been divided into three distinct phases, with the contractor finishing one before moving onto the next.  The first phase, from Greenwood to Aurora, was completed at the end of February and required the closure of all eastbound traffic lanes, as well as the frequent reduction of westbound traffic to a single lane.

Crews are currently working on the middle phase of the project, between Aurora and Meridian Avenue North.  Again, the eastbound travel lanes have been closed and westbound travel reduced to a single lane.  As of this writing, it is expected these traffic restrictions will remain in place until summer.  (See above for the detour map for eastbound motorists.)

The final phase, the one block segment between Meridian Avenue North and Corliss Avenue North (the street immediately to the west of I-5), will follow.  Fortunately, the width of the roadway here is sufficient that both eastbound and westbound traffic will be maintained during construction, although with the likely reduction down to a single lane in each direction.   

Project Description

This project will improve the corridor along N 105th Street and N/NE Northgate Way from Greenwood Ave N to Lake City Way NE. Improvements will include roadway repaving, new sidewalks and curb ramps, drainage improvements, street lighting and traffic signals, and Intelligent Transportation System (ITS) components.

Roadway improvements include:

  • New paving on the roadway from Greenwood Avenue N to Corliss Avenue N.
  • New drainage infrastructure, including new stormwater detention pipes and water quality features.
  • New five-foot-wide sidewalks and curb ramps.
  • New roadway markings.

Signal, lighting and ITS improvements include:

  • Eight new street lights between Greenwood Avenue N and Corliss Avenue N.
  • New dynamic message signs (DMS) at N 105th Street/Evanston Avenue N and Lake City Way NE/NE 120th Street.
  • New closed-circuit TV cameras to help with traffic management and safety, at Greenwood Ave N/N 105th Street, Ashworth Avenue N/N 105th Street, and Meridian Avenue N/N Northgate Way.
  • Seven new cameras that provide real-time traffic information to web-based systems and the DMS signs.

What to expect during construction:

This project will have considerable impacts on traffic and the public. SDOT will conduct outreach to residents and businesses in the neighborhood beginning in Fall 2012 until project completion to ensure that they have the information they need to cope with construction.

Project Benefits

When this project is completed, it will have significant benefits for the public and motorists, including:

  • Improved safety for pedestrians.
  • Elimination of potholes.
  • Eased traffic congestion.
  • Improved water quality.
  • Transit speed and reliability.
  • Real-time information for travelers.


The project will take a little more than a year to complete, so should be done before this coming fall (2014). 

More Information

Project Contacts:

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