• 2020-05-01

    SR 518 Corridor Planning Study

    The SR 518 Corridor Planning Study, published by the Washington State Department of Transportation (WSDOT) in May 2020, examines the stretch of State Route 518 running from SR 509 to Interstate 5 (milepost 0.00 to 3.42) in the Seattle area near Sea-Tac Airport. The study was conducted by WSDOT's Management of Mobility Division to evaluate transportation conditions and identify potential improvements along this key corridor. It was formally approved by WSDOT leadership in November 2019 and includes standard civil rights and accessibility notices in both English and Spanish.