SR 9 - 176th Street SE to SR 96 - Widening - Interim improvement design options

WSDOT will use a combination of measures to provide limited congestion relief on SR 9 through Clearview. These interim improvements will be implemented in phases, as determined by ongoing traffic monitoring.

The options selected are the result of meetings with the Clearview Community Association, a community open house in January 2017, and consultations with Snohomish County Public Works.

Improvements goal
The goal is to provide limited northbound congestion relief on SR 9 between 176th Street Southeast and SR 96.

Improvements completed in 2018

  • Restriped and widened SR 9 from 136th Street Southeast to SR 96.
    • Benefit: provides an additional northbound through-lane and connects to the existing four lane section that begins at SR 96. 

Traffic signal improvements completed in April 2017

  • SR 9 at 164th Street Southeast: The traffic signal was reconfigured to provide more green light time to northbound drivers (work completed April 1, 2017).
    • Benefit: Eastbound and westbound drivers now travel simultaneously through the intersection instead of each side taking its own turn. In addition, northbound and southbound traffic on SR 9 is allowed to turn left on a flashing yellow arrow. These changes in the traffic signal cycle increased the green light time for northbound/southbound traffic on SR 9 and reduced backups.
  • SR 9 at Cathcart Way and 176th Street Southeast: A flashing yellow arrow was added to the existing traffic signal cycle for left turns (work completed April 9, 2017).
    • Benefit at Cathcart Way: The number of northbound drivers turning left onto Cathcart Way frequently exceeded the capacity of the turn lane. This resulted in backups on SR 9, blocking through-traffic. By allowing drivers to turn left on a green light or a flashing yellow arrow, the backups in the left turn lane are minimized and it reduces the blocking that occurs on the SR 9 through-lane. Several community members suggested this improvement at the open house in January 2017.
    • Benefit at 176th Street Southeast: This change keeps traffic moving at the intersection and discourages frustrated drivers from traveling farther north and turning left to cut through a shopping area parking lot.