WSDOT widened more than four miles of SR 522 between the Snohomish River Bridge to the US 2 interchange in Monroe from two lanes to four.
The widening included four new bridges, including a new bridges across the Snohomish River, a median barrier to separate oncoming traffic, a new roundabout at 164th Street S.E./Main Street, a noise wall, a wildlife crossing, upgraded lighting and signs.
To create enough space for the widened highway, crews blasted away several hundred thousand cubic yards of rock. Learn more about the blasting work.
Widening the highway and adding a concrete center barrier to separate oncoming traffic reduces the risk of collisions. There were 100 collisions on this stretch of SR 522 from 2006 to 2010, including three fatal collisions.
The roundabout at 164th Street S.E./Main Street also reduces the likelihood of collisions. That intersection was the site of 54 collisions from 2006 to 2010.
Improving traffic flow also reduces the risk of congestion-related collisions such as rear-end and sideswipe.
Added capacity on this stretch of SR 522 improves traffic flow and cuts down on traffic times. The widened highway is in conjunction with a new interchange at US 2 to help relieve congestion in Monroe.
Partnerships & Cooperation
WSDOT worked closely with the local communities, Department of Fish and Wildlife and other agencies to plan and complete this project.
15700 Dayton Avenue N.
Seattle, WA 98133
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