Seattle’s Montlake Bridge to close: Your guide to weekend traffic woes

Lane closures return to northbound I-5 in SeaTac this weekend, plus plan on a full closure of the Montlake Bridge for deck repairs.

After a two-week Seafair break, major highway construction and slowdowns return to the Seattle area this weekend.

Interstate 5 northbound through SeaTac will be reduced to two lanes, from 8 p.m. Friday until 5 a.m. Monday, which will likely cause slowdowns a few miles before Southcenter. The junction with I-405 and Highway 518 will stay open. Later this month, weekend repaving moves north to the Duwamish River Bridge in Tukwila, where the worst clogs will affect I-405 trips from Renton toward Seattle.

• One lane each direction of Highway 509 through Burien will close for guardrail repairs in the median, if the weather stays dry. The left northbound lane will close from 7 p.m. Friday until 5 a.m. Monday, while the left southbound lane will close from 8 p.m. Friday to 6 a.m. Monday.

• The Montlake Bridge will close the entire weekend, from 11 p.m. Friday until 5 a.m. Monday, for repairs to the steel deck. If the job isn’t done now, an emergency failure and closure might occur later, according to the Washington State Department of Transportation (WSDOT).

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The bridge blockage will also close the westbound Montlake exit from Highway 520 to the University of Washington — forcing a long detour via I-5 and the U District for drivers heading from the Eastside to campus. Bicyclists and pedestrians can still cross the bridge, but at times they might be delayed up to 20 minutes.

• The right lane of southbound I-5 will close along the Northeast 50th Street exit, from 5 a.m. to 9 a.m. Sunday, to provide city workers “a safe space” to remove roadside debris. The onramp from 50th to southbound I-5 will close from 5 a.m. to 10 a.m.

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