The Spokane Street Viaduct is a freeway connecting the West Seattle Bridge to Interstate 5.

It runs above South Spokane Street in the SoDo neighborhood of Seattle and is generally four to six lanes wide.

However, a series of fatalities led to recognition that the aging Spokane Street Viaduct portion was unsafe to be used as a high-speed roadway.

[2] In 1997, the Seattle City Council unanimously adopted a resolution to lower the speed limit and to request that the WSDOT remove the word "Freeway" from signs marking the entrances to the Spokane Street Viaduct and the West Seattle Bridge.

The loop ramp from the West Seattle Bridge to northbound State Route 99 was closed on May 2, 2023, due to the formation of a 5 by 4 feet (1.5 m × 1.2 m) hole that left steel rebar exposed.