Caltrans said 24 of the 31 joints have now been replaced on the Richmond-San Rafael Bridge.
The new joints feature rubberized seal designed to shrink and expand with the changing temperatures, which will prevent cracking of the surrounding concrete road deck.
Next year, 30 joints on the lower deck of the bridge will also be replaced.
The upper deck project is still slated for completion in July.
Drivers can continue to expect lane closures from 9 p.m. to 5 a.m.