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In addition to the East Span Project, Caltrans is conducting five other seismic safety projects on the Bay Bridge.


West Approach

This project is bounded by 5th Street and the San Francisco cable anchorage structure. The project will reconstruct the main line of Interstate 80 and on-and off-ramps in San Francisco, including modifications to the ramps at the Transbay Transit Terminal. Work is targeted to be completed in spring 2007.


West Span

This project encompasses the suspension bridge between the San Francisco and Yerba Buena Island anchorage structures. It will strengthen various support structures including the anchorages, towers, caissons, and piers. Work on the caissons and piers was completed in February 2000. Work on the anchorages and towers is targeted to be completed in August 2001.


West Viaduct

This short section connects the West Span suspension bridges to the Yerba Buena Island Tunnel. The project has strengthened various support structures. Work began in May 1998 and was completed in November 1999.


Yerba Buena Island Tunnel

Work on the Yerba Buena Island Tunnel is targeted to be completed in October 2001.


East Span Interim Retrofit

The goal of this project is to prevent the kind of failure that occurred during the Loma Prieta quake when a portion of the upper deck collapsed into the lower deck. The project encompasses the full East Span of the bridge from Yerba Buena Island to Oakland, including the short viaduct structure connecting the bridge to the tunnel. The interim retrofit will strengthen the bridge to provide more life safety during a lower level yet more likely earthquake, but not for a maximum credible earthquake. The project will provide increased safety until final seismic upgrade actions for the East Span are completed.

Work on the interim retrofit was completed in July 2000. Additional steel plates and bolts are being installed. The work is being conducted during Caltrans' regular bridge maintenance periods and is not expected to cause any impacts to traffic flow.


If you have comments or questions about the East Span Seismic Safety Project, mail them to:

Greg Bayol
Public Information Office
Caltrans District 4
PO Box 23660
Oakland, CA 94623-0660

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