The Latest: All lanes reopen on San Rafael Bridge closed due to falling concrete Thursday

This photo released by the California Highway Patrol Marin shows chunks of concrete that fell from the upper deck to the lower deck on the Richmond-San Rafael Bridge near Richmond, Calif., Thursday, Feb. 7, 2019. The California Highway Patrol posted an alert about the Richmond-San Rafael bridge closure shortly before noon on Thursday, saying there was no estimated time for reopening. (California Highway Patrol Marin via AP)

Authorities have reopened all lanes of a major San Francisco Bay Area bridge that was closed for hours when concrete chunks fell onto a roadway.

The California Department of Transportation says the Interstate 580 Richmond-San Rafael Bridge was shortly after 11 a.m. Thursday when concrete chunks — some larger than a baseball — fell from the westbound upper deck onto the eastbound lower deck.

At least one car was struck and heavily damaged but no injuries were reported.

The shutdown lasted hours, except for one brief partial afternoon reopening before more concrete fell. The final eastbound lanes were reopened Thursday night.

The bridge carries tens of thousands of cars daily.

While contractors have been working on the upper deck, Caltrans says it hasn’t determined what caused the concrete to fall.

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