| East 21st Street Bridge | |
| Carries: | 4 lanes of |
| Crosses: | Thea Foss Waterway |
| Locale: | Tacoma, Washington, United States |
| Design: | Cable-stayed bridge |
| Length: | 682feet or more |
| Width: | 71.5feet |
| Height: | 180feet |
| Mainspan: | 370feet |
| Coordinates: | 47.244°N -122.432°W |
The East 21st Street Bridge is a 682foot or 707foot or 992foot long cable-stayed bridge in Tacoma, Washington completed in January 1997. The bridge, whose most significant feature is two 180feet tall towers, carries four lanes State Route 509 (SR 509) across the Thea Foss Waterway from downtown Tacoma to the Port of Tacoma. SR 509 ends at a single point urban interchange with Interstate 705 west of the bridge, built as part of the same $165.3 million WSDOT project that also funded the bridge's construction.
The architect for the bridge was Jim Merritt, a Tacoma architect.
It is sometimes called Foss Waterway Bridge, although the Murray Morgan Bridge also crosses Foss Waterway.