Caltrans is scheduled to close Highway 101 in Petaluma Wednesday and Thursday nights to work on the Old Redwood Highway interchange.
Northbound Highway 101 at Old Redwood Highway will be closed from 11 p.m. Wednesday to 5 a.m. Thursday, Caltrans said. The northbound onramp from Old Redwood Highway will also be closed.
The northbound detour will involve exiting at Old Redwood Highway, turning right and returning to northbound Highway 101 in Cotati.
Southbound Highway 101 will close on Thursday night from 11 p.m. to 5 a.m. Friday. The onramp from Petaluma Boulevard North will also be closed.
The southbound detour will involve exiting at Petaluma Boulevard North and turning right, turning left on East Washington Street and continuing to southbound Highway 101.