San Mateo–Hayward Bridge They provide power to the peninsula and San Francisco. The bridge was closed in the wake of the 1989 Loma Prieta earthquake as a precaution, but reopened on October 18, 1989. It underwent an extensive seismic retrofitting from 1997 through 2000 to protect against earthquake damage. The bridge was considered the worst evening commute in the Bay Area, which ended with the completion of a new eastern trestle carrying westbound bridge traffic in 2002. Eastbound bridge traffic took over the old trestle completely, although eastbound traffic was not expanded to three lanes until February 2003. Funded as part of BATA's
California State Route 17 in Oakland, destroyed in the 1989 Loma Prieta earthquake) but parts have been redesignated. The section between Interstate 80 and US 101 in San Rafael was renumbered as an extension of Interstate 580. Prior to the redesignation, this part of SR 17 followed Richmond streets, including an expressway called Hoffman Boulevard, to the bridge; a freeway built to Interstate standards was completed in 1990 after the corridor became 580's northwestern leg. Additionally, SR 17 between Interstate 280 in San Jose and the freeway's new northern terminus in Oakland was re-designated as Interstate 880 later that year. Since the late 1990s,