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I-5 - SB S 320th St to Duwamish River Bridge - Concrete Pavement Rehab - Alternate Routes

Southbound I-5 alternate routes

Alternate routes during southbound I-5 lane reductions

Drivers should plan to use alternate routes during the five weekends in July and August when southbound I-5 is reduced to two lanes in SeaTac, Des Moines and Tukwila. Drivers should also allow at least an extra hour of travel time from 9 a.m. to 9 p.m. during the weekend lane reductions. Up-to-date information will be available on WSDOT’s mobile app and traffic map.

Avoid SR 509 south of SR 518 Saturday, July 23
Marine View Drive just south of SR 509 in Des Moines will be closed from 4:45 to 8 p.m. for the Waterland Parade. Avoid SR 509 south of SR 518 between 2 and 10 p.m. Saturday, July 23.

Drivers should also consider alternatives including delaying trips, traveling early in the morning or late in the evening, or using transit, carpools or vanpools.