Spokane Street Bridge, Road bridge in Seattle, United States

The Spokane Street Bridge is a swing bridge in Seattle, Washington, linking Harbor Island to West Seattle over the Duwamish River. It consists of two concrete spans that rotate together to let vessels pass through the waterway below.

The first bridge on this site opened in 1924 and served the area for decades until a freighter collision in 1978 caused serious damage. Federal funding followed, and the current structure was completed in 1991.

The bridge takes its name from Spokane Street, which is itself named after the Spokane people who lived across the region long before European settlers arrived. The name appears on street signs and in everyday local use throughout the surrounding neighborhood.

The bridge opens about 1,500 times a year for river traffic, so drivers and pedestrians may face short waits. It carries Southwest Spokane Street between Harbor Island and West Seattle. When the high-rise West Seattle Bridge closed in 2020, this bridge became the main route to West Seattle, restricted to transit, freight, emergency vehicles and longshore workers, with general traffic allowed only from 9 p.m. to 5 a.m.

Each 7,500-short-ton leaf floats on a 100-inch steel barrel of hydraulic oil inside a center pier on either side of the river. Because the bridge meets the Duwamish at an oblique angle, the leaves need only a one-eighth turn to clear the channel. The design won the American Society of Civil Engineers' Outstanding Engineering Achievement Award in 1992.