The Richmond-San Rafael Bridge finally reopened Thursday night after a lengthy closure prompted by large pieces of concrete falling from the upper deck onto the roadway of the lower deck.
The bridge was originally closed at about 11 a.m. after a report of a vehicle being struck by a large chunk of concrete.
Just after 3 p.m., California Highway Patrol posted on Facebook that Caltrans engineers determined they could open one lane in each direction and still safely do their repair work.
They changed their minds shortly after 4 p.m.
"Unfortunately opening one lane in each direction was unsuccessful and the flowing traffic on the bridge caused additional pieces of roadway to come loose and fall," Marin CHP wrote in a post on Facebook.
Thirty minutes later officials said "let's try this again" and announced one lane would be open eastbound (from San Rafael to Richmond), while westbound traffic would remain completely closed.
Throughout the evening commute, all westbound lanes remained closed and additional lanes were slowly opened to traffic in the eastbound direction. Around 7:30 p.m., westbound lanes were fully reopened, and Caltrans began opening the rest of the eastbound lanes.