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.
• Denny Way will be partly blocked next to Seattle City Light’s electric substation project, near Stewart Street and I-5. Westbound lanes will close all day Saturday, then eastbound lanes close all day Sunday, to reopen at 5 a.m. Monday.
• Broad Street in Seattle, a main route to Belltown and an Alaskan Way Viaduct entrance, will close between First and Third Avenues, for repaving on Second Avenue, which will be narrowed to one southbound lane at times.
• Aurora Bridge inspections will close two right lanes northbound, from 5 a.m. to 11 a.m. both Saturday and Sunday.
• A full two-week closure of Highway 532 in Stanwood, to replace a culvert at Church Creek, begins Friday at 8 p.m. Detours using local roads will be posted.
• Full-time summer lane closures and diversions continue on I-90, including concrete re-decking eastbound near North Bend and a bridge resurfacing westbound near Snoqualmie Pass.
• Three Seattle Mariners baseball games and one Sounders FC soccer match are scheduled, along with the Dota 2 video-gaming championships at KeyArena continuing through Saturday, among many events listed by the Seattle Department of Transportation.
Weekend gameday Sounder trains are traveling to and from the soccer match that begins at 1 p.m. Saturday, and the baseball game that begins at 1:10 p.m. Sunday. Schedules are at soundtransit.org. The other Mariners games are at 7:10 p.m. Friday and 6:10 p.m. Saturday.
Besides all the lane closures, possible showers in the Sunday forecast may turn oil spatters and tire grit into a slippery sluice, following a record 53 or more days without measurable precipitation.