If your weekend plans include a drive home from the Eastside through Seattle, check your route before setting out. Westbound State Route 520 will close between Montlake Boulevard and Interstate 5 from 11 p.m. Friday, Nov. 13, until 5 a.m. Monday, Nov. 16, weather permitting.
The closure is on the Seattle side of the route. The floating bridge across Lake Washington will remain open in both directions, according to the Washington State Department of Transportation.
What will change for drivers
All westbound traffic crossing the lake will have to leave SR 520 at Montlake Boulevard or Lake Washington Boulevard. Drivers continuing toward I-5 will need another route.
Eastbound SR 520 and the SR 520 Trail will remain open.
Crews will repair expansion joints and move the westbound off-ramp connection to northbound I-5 as part of the Portage Bay Bridge and Roanoke Lid Project.
Before you leave
WSDOT says bad weather could delay or cancel the closure. Check the project's current closure notice and real-time travel map before your trip, especially if you normally use westbound SR 520 to reach I-5.
The work also means construction noise for neighbors near the project throughout the weekend. Questions about construction can go to the project's 24-hour hotline, 206-319-4520.
Sources: WSDOT's Nov. 6 construction update and current closure notice, checked Nov. 10, 2026.
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