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I Street Bridge Replacement

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The I Street Bridge is a historic through truss swing bridge carrying I Street over the Sacramento River in Sacramento, CA. It connects Sacramento with West Sacramento. Originally constructed in 1911, the bridge is 900 feet long with a 330-foot main swing span. The bridge carries highway access on the upper deck and railway access on the lower deck.

This project will include the construction of a new bridge upstream of the existing bridge. As a subconsultant to Mark Thomas, M&M was selected to design the movable span of the new I Street Bridge. Our portion of the design includes all structural, mechanical, and electrical design of the main span. Initial project tasks included a conceptual study and permitting. The project is currently in the final design phase.

The new structure will accommodate highway traffic, bicycle lanes, pedestrian sidewalks, and accommodate a future street car. The project is expected to cost approximately $260 million and is estimated to be completed by 2027.

For more information, please visit the City of Sacramento's I Street Bridge Project page: 

Renderings courtesy of project architect TY Lin 

Bridge Geometry
Length of Main Span 330 Feet
Total Project Length 900 Feet
Lanes on Structure Three Lanes, Street Car, Bicycle Lanes, and Sidewalks

This new $200-million bridge will be an instant modern landmark linking the exciting new attractions and neighborhoods taking shape on both sides of the Sacramento River. It will eliminate the artificial barriers preventing us from being one waterfront district.

-Darrell Steinberg, Sacramento Mayor