- Between 2000 and 2017, we expect to invest $350 million to improve SR 9 through Snohomish County.
- For more information, take a look at the SR 9 corridor project folio (pdf 2.3 mb) and the SR 9 Safety Study (pdf 1mb).
State Route 9 extends 98 miles, from SR 522 north of Bothell to the Canadian border. The highway parallels Interstate 5 to the east as it winds through Snohomish, Skagit, and Whatcom counties.
Growing population, increasing congestion
Due to regional economic development and the demand for affordable housing, the population of Snohomish County increased by nearly 80 percent between 1980 and 2000.
This population growth has increased traffic on SR 9 throughout Snohomish County. The highway is now an important corridor for both commercial vehicles and commuters. Current traffic volumes have exceeded the capacity of the two-lane roadway leading to congestion and delay during peak travel times.
Congestion-related collisions - like sideswipe and rear-end collisions - have also increased along SR 9. From 1993 to 2000, there were an average of 325 collisions per year on SR 9 in Snohomish County. By 2007, that average had increased to almost 450 collisions per year, totaling nearly 4,000 collisions between 2000 and 2007.
The end result: Improving safety and reducing congestion
Between 2000 and 2017, WSDOT will invest $350 million to transform SR 9 into a wider, safer highway. We will widen the highway to four lanes in some areas, add turn lanes at key intersections to reduce the risk of collisions, install divided medians at select locations to prevent crossover collisions, and upgrade pavement markings, guardrail, drainage, culverts and lighting where needed.
When we wrap up work in 2017, these targeted improvements will help relieve congestion, improve traffic flow and enhance safety throughout the SR 9 corridor.
Current SR 9 improvement projects under way include:
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