Caltrans has scheduled freeway closures for northbound Highway 101 and the Petaluma Boulevard South on-ramp. Petaluma Boulevard South at the Petaluma River Bridge will also be closed for several nights of construction.

Closure of Petaluma Boulevard South:

• Petaluma Boulevard South will be closed in both directions at the Petaluma River Bridge on March 16, 17 and 18 from 9 p.m. to 5 a.m. The closure is necessary for the placement of girders on the northbound bridge being constructed.
• Detour for east side of Petaluma Boulevard South closure: Use the northbound 101 on-ramp from Petaluma Boulevard South.
• Detour for west side of Petaluma Boulevard South: Take Petaluma Boulevard South, turn right on D Street, turn right on Lakeville Street, and continue to Highway 101.

Closure of northbound Highway 101 and the northbound on-ramp from Petaluma Boulevard South:

• Northbound Highway 101 and the on-ramp from Petaluma Boulevard South will be closed at the new Kastania Road overcrossing south of the Petaluma River on March 19, March 23, 24, 25 and 26 from 11 p.m. to 5 a.m. The closure is necessary for the placement of girders on the new northbound portion of the bridge.
• Detour: Northbound Highway 101 traffic will exit on Petaluma Boulevard South and proceed through downtown Petaluma, turn right on D Street, right on Lakeville Street and return to northbound 101.