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Learn about where and when construction is happening throughout the ST district.
Construction map for SR99 Bypass, Federal Way Link Extension

Temporary bypass installed on SR 99 in SeaTac

Publish Date

Sound Transit opened a temporary bypass around a short stretch of State Route 99 in SeaTac between South 204th and South 208th Streets. Our crews shifted lanes eastward from the main roadway to make way for construction of our elevated light rail track. 

Curious what the new bypass looks like from a bird’s-eye view? 

Watch the video

The new traffic pattern will remain in place until we complete this portion of Link light rail construction. We expect to remove the bypass and return SR 99 to its normal configuration in October 2022.
 
Sound Transit is also building a bridge for SR 99 in this area for the Washington State Department of Transportation’s future SR 509 Project. 

For more information on the SR 509 project, visit wsdot.wa.gov/Projects/SR509/completion or contact Chris Hoffman: hoffmac@consultant.wsdot.wa.gov, 206-387-2050. 

This alert is available in Korean, Russian, Somali, Spanish and Vietnamese. Click on the link below to view. 

SeaTac 99번 국도로 임시 우회도로 구축 예정

Готовится открытие временной объездной дороги на участке шоссе SR 99 в районе SeaTac

Desvío temporal en la SR 99 en SeaTac

Jid ku meelgaar ah oo imanaya SR 99 oo gelaya gudaha SeaTac

Đường tránh tạm thời trên SR 99 tại SeaTac
 

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