- WSDOT announces next steps for interim improvements to provide limited congestion relief. Learn more on our interim improvements page.
- The full widening project is currently in the design phase and has funding for design and right-of-way acquisition only. The proposed widening has not received funding for construction.
- There is no estimate on when widening construction could begin, since it's dependent on receiving funding from the State Legislature.
We plan to widen nearly three miles of State Route 9 from a three lane road to a four-lane divided highway from 176th Street Southeast in Clearview north to SR 96/Broadway Avenue.
Why is WSDOT
widening SR 9 between 176th Street Southeast and SR 96?
This stretch of SR 9 is the missing link between previously widened sections. Since 2005, we have widened SR 9 from two lanes to four from its southern starting point near Woodinville north to 176th Street Southeast. We also widened SR 9 from SR 96/Broadway to Marsh Road. That leaves a three mile section between 176th Street Southeast and SR 96 where there is only one northbound lane and two southbound lanes.
SR 9 is an important corridor for both commuter and commercial traffic. Current traffic volumes have exceeded the capacity of this highway.
Higher traffic volumes increase the risk of serious cross over and head-on collisions as drivers try to turn across heavy traffic.
To reduce serious collisions and keep traffic moving, the project will add a raised center median to separate oncoming traffic and provide U-turn locations at signalized intersections and other locations.
There will be U-turns at all existing signalized intersections. Other U-turn locations have not been determined yet. In general, however, when U-turn locations are installed on a divided highway they are placed at approximately half-mile intervals depending on sight-distance and other safety factors.
Fewer collisions in previously widened areas of SR 9
The effectiveness of a raised center median and designated U-turn locations is evident when comparing the number of collisions that occurred before and after highway widening in other areas of SR 9.
WSDOT tracked the number of crashes that occurred between SR 522 and 212th Street Southeast for five years before it was widened and seven years after. The results:
- A 50 percent reduction in all collisions.
- A 68 percent reduction in injury collisions.
- A 51 percent reduction in rear-end collisions.
- A 67 percent reduction in collisions involving vehicles entering SR 9 from a driveway or intersection.
The End Result
The widening will result in a continuous four-lane highway that stretches more than eight miles from SR 522 in the Woodinville area to Marsh Road, south of Snohomish.
- A raised center median and designated U-turn locations reduces the risk of serious collisions by limiting the conflicts that lead to collisions.
- New guardrails, pedestrian crossings, pavement markings and elimination of roadside hazards will bring the highway up the most current safety standards.
- This project will improve traffic capacity and flow by adding an additional northbound lane and rebuilding and realigning the existing southbound lanes as necessary.
- Widening this section will eliminate the bottleneck that regularly occurs near 176th Street Southeast where the northbound lanes are reduced from two to one.
- Congestion is frequently caused by collisions. Reducing collisions will help ease congestion and improve travel times.
What is the project timeline?
2013 - 2020 - Project design work.
June 15, 2016 - WSDOT attended a Clearview Community Association meeting to present information about the project.
Jan. 11, 2017 - WSDOT held an open house in Clearview to present options for interim improvements to provide limited congestion relief.
2018 - 2020 - Right-of-way acquisition.
No date: There is no start date for construction work, which is expected to take two to three years.
|Financial Data for PIN 100904B
||Amount ($ in thousands)
|2003 Gas Tax (Nickel Funding)
|2005 Gas Tax (TPA)
|Pre-Existing Funds (PEF)
The total estimated cost for design engineering is $5.9 million. The total estimated cost for right of way is $7.4 million.
How can I get more information?
WSDOT project engineer - design
back to top