The Highway 101 lane closures and traffic shift at Highway 116 have been postponed until January, Caltrans said, due to weather. The paving that is needed requires warmer weather.
The full Highway 101 closure at Kastania/South Petaluma Boulevard is still scheduled for Dec. 20, as Caltrans notes:
A full closure of northbound and southbound U.S. 101 is scheduled for Friday night, Dec. 20, to remove falsework from the Kastania Overcrossing, just south of the Petaluma Boulevard South interchange.
Northbound U.S. 101 will be closed at the Kastania Overcrossing Friday night, December 20, from 11:59 p.m. to 7 a.m. Detour: Traffic will exit at a temporary off-ramp to Petaluma Boulevard South and return to northbound U.S. 101 at the Petaluma Boulevard South on-ramp.
Southbound U.S. 101 will be closed Friday, December 20, from 11 p.m. to 6 a.m. Detour: Take SR 116/Lakeville Highway to SR 37 and continue to southbound U.S. 101.