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Seismic Retrofit Phase 3

Phase 3 (2008- )

The third and final phase of the Golden Gate Bridge Seismic Retrofit Construction Project was separated into two sub phases.

Phase 3A: Retrofit of the North Anchorage Housing and Pylon N1

Phase 3A is estimated at $125 million and is being funded using a combination of federal funds along with regional and state earmarks. A construction contract for Phase 3A was awarded in April 2008. Construction is planned for completion in 2013/2014.

Phase 3B: Retrofit of the Main Suspension Span, Main Towers, South Tower Pier and Fender

Phase 3B is estimated at $260 million and will be funded using a combination of federal funds along with regional and state earmarks. Phase 3B will go out to bid in 2013/2014 and take up to 4 years to complete.

The seismic retrofit measures for these phases consist of strengthening foundations, installation of micropiles and rock bolts, construction of reinforced concrete shearwalls, replacement of the housing roof/roadway deck with a pre-cast concrete slab-on-steel stringer deck system involving nighttime lane closures, and other structural modifications.

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