Demolition of the northbound Highway 101 bridge over Highway 116 in Petaluma is scheduled for later this month.  This demolition will also require a full closure of Highway 116.

On Dec. 17, Caltrans has scheduled a traffic shift for northbound 101 at the 116 interchange.  Southbound 101 traffic will be shifted to the right shoulder. This shift will allow northbound traffic to be shifted to the left across the median to the southbound bridge. There will be two northbound lanes and two southbound lanes sharing the same bridge. After passing over 116, northbound traffic will shift to the right and return to the original roadway. This traffic shift will remain in effect until summer or fall of 2014 while the old northbound bridge over 116 is removed and replaced with a new bridge.

Northbound and southbound lanes will be separated by a concrete barrier, and the speed limit in the construction zone will reduced to 45 mph. It is essential for the safety of motorists and construction workers that this speed limit is observed. This speed limit will be enforced by the California Highway Patrol.

The northbound 101 off-ramp to 116 will be closed  Dec. 17 from 10 p.m. to 5 a.m.

An additional full closure is planned for northbound and southbound 101 on  Dec. 20 to remove falsework from the Kastania overcrossing, just south of the Petaluma Boulevard South interchange. Northbound 101 will be closed at the Kastania overcrossing Dec. 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 101 will be closed Dec. 20 from 11 p.m. to 6 a.m.

Detour: Take 116/Lakeville Highway to SR 37 and continue to southbound U.S. 101.