Travelers should plan ahead and find alternate routes for trips across Lake Washington and southbound Interstate 5 in Seattle. Beginning Friday night, Sept. 30, State Route 520 will close across the lake and southbound I-5 will have closures near the off-ramp to Columbian Way and the West Seattle Bridge.
Both directions of SR 520 between I-5 in Seattle and 92nd Avenue Northeast in Clyde Hill and all associated on – and off-ramps will close from 11 p.m. Friday, Sept. 30, to 5 a.m. Monday, Oct. 3.
During the closure, crews will shift the alignment of SR 520 lanes near Seattle’s Montlake neighborhood to create a work zone between the east and westbound lanes. Crews have made significant progress in the area as they as they continue to build a new lid over SR 520 as part of the $455 million SR 520 Montlake Project. The project also builds a new bicycle and pedestrian bridge over SR 520 and new eastbound lanes between Montlake Boulevard and the floating bridge on Lake Washington.
The SR 520 Trail and I-90 across Lake Washington will remain open during the weekend closure.
Revive I-5 work
Beginning at 10 p.m. Friday, Sept. 30, the off-ramp to Columbian Way and the West Seattle Bridge will close, along with the right lane of southbound I-5 in that area. People going to Columbian Way or the West Seattle Bridge will detour via Michigan Street and back onto northbound I-5 and use the northbound exits. During the closure, crews will work on expansion joints and paving. The work is weather-dependent. All work will finish by 5 a.m. Monday, Oct. 3.
Mercer off-ramp closed
Starting at 9 p.m. Friday, Sept. 30, crews will also close the southbound I-5 off-ramp to Mercer Street. The ramp closure, part of the SR 520/I-5 Express Lanes Connection Project, will wrap up at 4 a.m. Monday, Oct. .3.
Drivers crossing Lake Washington during the weekend should take I-90 as an alternate route or consider delaying their trips if possible. People in Snohomish County going to the eastside should consider using I-405.
With additional traffic using I-90, people who usually travel on I-5 should use alternate routes like I-405 and SR 99 or consider using light rail or bus service. People also should consider rescheduling discretionary trips.