This is not the first Labor Day weekend closure of the bridge, but it is the first time they have had to shut it down on a regular commute day.
Say good-bye to the Bay Bridge as you've known it for 70 years. The section just east of the Yerba Buena Tunnel will never be the same after this weekend. Caltrans is connecting the cantilever section to a temporary detour which will someday be replaced with a new bridge.
Sometime Friday afternoon, an old section of bridge will be cut out, followed by the new connector being lifted and rolled into place.
Caltrans will also take advantage of the empty bridge to catch up and get ahead on maintenance on things like pot holes and cutting back vegetation on the face of the Yerba Buena Tunnel.
"This is going to happen. There is not a weather concern anymore," said Bart Ney with Caltrans.
It is the first full closure to include a regular commute day. It is unknown how many people will use BART, how many will take alternate bridges, or just stay home. Two years ago, the Golden Gate Bridge handled 20,000 extra cars a day.
Watch our live web cam of the Bay Bridge Labor Day weekend construction.
For more information about the Bay Bridge closure during the Labor Day weekend, check out our resources page.
For transit options, visit www.511.org/baybridge
For the latest on the Bay Bridge construction project, visit baybridgeinfo.org
Follow updates on the bridge closure on Twitter at twitter.com/BayBridgeInfo