Washington State Route 531
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SR 531 highlighted in red
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| Route information | ||||
| Auxiliary route of I‑5 | ||||
| Defined by RCW 47.17.757 | ||||
| Maintained by WSDOT | ||||
| Length: | 9.88 mi (15.90 km) | |||
| Existed: | 1991 – present | |||
| Major junctions | ||||
| West end: |
 Wenberg County Park in Lake Goodwin
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 I‑5 in North Lakewood
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| East end: |
 SR 9 near Arlington
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| Highway system | ||||
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State Route 531 (SR 531) is a short Washington state highway in Snohomish County. It extends east 9.88 miles (15.90 km), from Wenberg County Park in the community of Lake Goodwin, to SR 9 in southeast Arlington. SR 531 intersects Interstate 5 (I-5), and passes the Arlington Airport. The route connects I-5 to SR 9, Smokey Point, and Wenberg County Park. The Washington State Legislature approved SR 531's current route in 1991. Since then, construction projects, arranged by the Washington State Department of Transportation (WSDOT), have turned this small road into an arterial street. Even though the Washington State Legislature and WSDOT approved SR 531 in 1991, they erected no signs until April 1, 1992, when the law creating the road took effect.
The road now used by SR 531 has existed as a separate route since at least 1911. A map dating from 1911 shows that 172nd Street, then known simply as Lakewood Road and Edgecomb Road, extended east from its current intersection with SR 9 to the banks of the South Fork Stillaguamish River.
State Route 531 runs about 9.88 miles (15.90 km), from Wenberg County Park to State Route 9 south of Arlington. The route links the communities of Lake Goodwin, North Lakewood (also known as Lakewood), Smokey Point, and Edgecomb. It also passes four schools in the Lakewood School District, as well as Weston High School in the Arlington School District. The road intersects four major arteries: Forty-Five Road, Interstate 5, Smokey Point Boulevard (formerly known as U.S. Route 99), and 67th Avenue, before ending at SR 9. WSDOT found that, based on average annual daily traffic (AADT) data, about 35,000 motorists utilize the road daily at the I-5 interchange.
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