Marion Street Bridge, Road bridge in Salem, Oregon.

Marion Street Bridge is a road bridge spanning the Willamette River between Salem and West Salem in Oregon. The structure carries two westbound lanes and forms part of the Oregon Route 22 highway corridor.

Construction finished in 1954, making it the longest structure of its type west of the Mississippi River at that time. The completion represented a major step forward in transportation infrastructure for Marion County.

The bridge carries only westbound traffic, while its companion Center Street Bridge handles eastbound traffic. This one-way pairing shapes daily travel between Salem and West Salem, with drivers using Marion Street, Commercial Street, or the Front Street quarter-loop ramp to enter the span.

Vehicles can access the bridge from Marion Street, Commercial Street, and a quarter-loop ramp added from Front Street in 1981. These multiple entry points make it easy to reach the crossing from different directions.

It uses a plate girder design and works with the Center Street Bridge in a one-way pair system across the river. This parallel arrangement splits traffic flow between both shores in a coordinated way.