The Bay Area has a higher number of bridges or overpasses with structural deficiencies than other major metropolitan areas, according to a report released Wednesday by a coalition that is fighting threatened cuts in federal transportation spending.

About 21 percent -- or 380 bridges or overpasses -- are structurally deficient in the metro area covering most of Alameda, Contra Costa, San Francisco and Marin counties, according to the report by Transportation for America. That rate is the second highest in the nation among metropolitan areas with more than 2 million residents. The highest was metropolitan Pittsburgh, with deficiencies in 30 percent of its bridges and overpasses.

Bridges in the San Jose metropolitan area, which includes Santa Clara and San Benito counties, have the highest deficiency rate among regions with populations between 1 million and 2 million people. About 19 percent, or 189 bridges, are structurally deficient, the coalition reported.

A deficiency doesn't mean a bridge is in imminent danger of failing, but that work or increased inspections are needed, the group said. The report does not name specific structures, but a map on the group's website, http://t4america.org, shows the Carquinez Bridge as having a deficiency rating because of poor pavement. The site also identified the following bridges as deficient because of deck pavement: the Highway 24 bridge over Acalanes Road in Lafayette; the Monument Boulevard overpass over the Walnut Creek channel near the border of Concord and Walnut Creek; and a West Grand Avenue bridge over railroad tracks in Oakland.

The report was based on a federal inventory database rating bridge pavement, structures and foundations in 2009, the most recent figures available.

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