Golden Gate Bridge nears last phase of quake upgrades

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Golden Gate Bridge nears last phase of quake upgrades
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Officials aim to select a construction contractor in December for the five-year, $880 million project.

Golden Gate Bridge officials are preparing to launch the final and largest phase of a decades-long project to make the 85-year-old structure withstand stronger earthquakes.

The seismic retrofit project, which was launched in 1997, was prompted by the Loma Prieta earthquake in 1989. The 15-second, 6.9-magnitude quake caused major damage to bridges and highways, including the collapse of the top deck of the Bay Bridge and the Cypress Street viaduct in Oakland. The Golden Gate Bridge had no observable damage but was located about 60 miles north of the quake’s epicenter.

The final phase will install 38 devices to absorb quake energy that would otherwise flow into the bridge, Bauer-Furbush said. Special joints will be added to the sides of each tower and near the pylons at each edge of the main span that allow for three-dimensional movement. Bauer-Furbush said three contractors have submitted applications for the project in response to a request sent out in May. The district’s board is expected to select a contractor and begin a yearlong process to work through each step of the construction to set prices, timelines and other details.

The final retrofit project still has a substantial funding gap that must be closed before its planned 2025 construction start. About $451 million of the $880 million has been raised, with the majority of that funding coming from the $1.1 trillion federal infrastructure legislation of 2021.

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