Traffic from the Peninsula is advised to use I-280 northbound into downtown San Francisco. Drivers can enter the Bay Bridge on either Bryant and 2nd or Harrison at 1st/Essex Street on-ramps.
The roadway reopened around 1:30 p.m., according to the CHP.
A person present on the bridge during the lane closure surrendered to authorities, the highway patrol said.
Stay with ABC7 News for the latest details on this developing story.