The contractor working for the Seattle Department of Transportation (SDOT) to widen the Spokane Street Viaduct will close both westbound lanes of the structure from 10 PM on Friday, September 30, to 10 AM on Sunday, October 2, to pour deck spans at the east end of the project. The westbound lanes will be closed from west of I-5 to the Alaskan Way Viaduct. All eastbound lanes on the Spokane Street Viaduct will remain open.
During the closure, southbound I-5 traffic will be directed to the S Forest Street exit to access surface streets leading to the lower Spokane Street Swing Bridge. Northbound I-5 traffic and westbound traffic from Columbian Way will be detoured to surface streets at 6th Avenue South to the detour route leading to the swing bridge. Signage will be posted to direct drivers along these routes.
Motorists will also still be able to use southbound SR-99 to access the West Seattle High-Rise Bridge.
And again, “Spokane Street Viaduct” refers to the stretch of the West Seattle Bridge between I-5 and Highway 99.