On northbound I-5, lane restrictions will snarl traffic from Federal Way through SeaTac and Tukwila. On the Highway 520 bridge, all eastbound lanes will be closed from 11 p.m. Friday until 5 a.m. Monday.
Traffic jams return to Southcenter Hill this weekend, as bridge and pavement repairs over the Duwamish River will reduce northbound Interstate 5 to just two lanes.
Lane reductions last from 8 p.m. Friday until 5 a.m. Monday, causing congestion from Federal Way through SeaTac and Tukwila. Delays could also spill onto nearby segments of Highway 518 coming downhill from the airport, and Interstate 405 converging from Renton.
Workers will be replacing worn-out bridge expansion joints and rutted pavement.
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The final closure of this year is scheduled for next weekend, Oct. 20-23, followed by work in 2018. The $31 million job is funded by state gasoline taxes.
In other traffic hot spots:
• The eastbound Highway 520 bridge, all the way from I-5 to 84th Ave. Northeast, will close from 11 p.m. Friday until 5 a.m. Monday, while state crews put finishing touches on a bus-carpool extension near Foster Island. High-occupancy vehicles will be able to break out of general traffic one mile sooner, on their way to the Eastside.
• Lane reductions and diversions continue at Interstate 90 deck-repair sites through the Snoqualmie Pass corridor, including the high westbound bridge near the West Summit interchange. The work was supposed to be finished by Labor Day.
• A few rallies and events will affect downtown Seattle. The main event Saturday is a Nationwide Solidarity March for Peace at 11 a.m., from the state ferry terminal to Occidental Park and City Hall. Sunday events include the No Muslim Ban Ever rally and march, set for early afternoon near Westlake Park; a Sounders FC match against Dallas at 4:30 p.m.; and the Arcade Fire concert in KeyArena at 7:30 p.m.
• The southbound I-5 express lanes won’t open Saturday until 10:30 a.m., and at 11 a.m. Sunday, rather than the usual 8 a.m. Workers will clean stormwater drains on the Ship Canal Bridge.