The left lane of northbound SR 99 will close from 8 p.m. to 5 a.m. nightly this week, from Monday, April 6, through Friday morning, April 10, between South 216th and 200th streets in SeaTac for lane striping and curb upgrades.

Contractor crews working for the Washington State Department of Transportation will keep at least one northbound SR 99 lane open through this area each night, but delays are possible through the work zone.

This work supports a paving and sidewalk improvement project along both directions of SR 99 between SR 516 and South 200th Street that is nearly complete.

Real-time traffic information is available on the WSDOT mobile app and the real-time travel map.