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Project Title & Location
SR 9 – SR 522 to 212th St. SE; Widening
(Stages 1b & 2), North Woodinville
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Project Description
This project adds lanes and enhances safety on 1.8 miles of congested state highway.
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Design Construction Impacts
Recently updated traffic data reveals that traffic levels have grown much faster than expected when original design began over ten years ago. Daily volume has reached the 25,000 Average Daily Traffic threshold for installation of raised median, per State Law, rather than a two-way left-turn lane. The new traffic data also shows need for more left turn lanes, right turn lanes and longer turn lanes than originally planned. Channelization plans are being revised to meet these increased needs. WSDOT will initiate a public information effort to communicate these changes to affected roadway users.
The formal announcement by King County of the Brightwater site selection adjoining this section of SR 9 is providing opportunity for cooperative effort and coordination with Brightwater and Snohomish County.
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Environmental Impacts / Compliance
No significant impacts. This project will meet all applicable permit requirements and avoid any stream or wetland impacts where possible or mitigate for the impact through the creation or enhancement of new wetlands.
This project will construct storm water facilities to treat for quality and quantity. Construction will incorporate use of temporary erosion control measures to minimize impacts.
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Impacts to Traffic
Construction will start in the summer of 2005. Traffic will experience narrower lanes and shoulders, slower speeds and occasional stopped traffic in construction work zones during the daytime. Also, some night and weekend lane and roadway closures may occur during the construction period. All 4 lanes should be open to traffic by summer 2007.
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