Date:
April 25, 2026 to April 26, 2026
Time: 9 p.m. Saturday to 9 a.m. Sunday
Activity details:
Full highway closure
High-impact construction
Impact type:
NighttimeOvernightTraffic
Description: Crews will use this closure to temporary relocate utilities across the mainlines. This work is part of the SR 520 Portage Bay Bridge and Roanoke Lid Project.
Traffic: Both directions of SR 520 between Montlake Boulevard and I-5 in Seattle will close for construction beginning at 9 p.m. on Saturday, April 25, until 9 a.m. on Sunday, April 26.
During this time all westbound SR 520 traffic coming across Lake Washington will exit at either Montlake or Lake Washington Boulevards. Traffic from I-5 wanting to access eastbound SR 520 must use alternate routes. SR 520 and the SR 520 Trail remains open across Lake Washington. It is only the section of SR 520 between Montlake and I-5 that will close.
