Lane closures are scheduled to start today on northbound Highway 101 from just north of the Sonoma County line to the Kenilworth Pedestrian overcrossing in Petaluma.

During this closure, motorists on Petaluma Boulevard South can take a detour north on Petaluma Boulevard South, turn right on East D. Street, turn right on Lakeville Street, left on Caulfield Lane, left on South McDowell Boulevard., left on East Washington Street, continue to Highway 101, and turn left at the northbound Highway 101 loop on-ramp.

One northbound lane will be closed Monday night through Thursday night from 11 p.m. to 6 a.m. At least one lane will remain open at all times.

Caltrans has also scheduled the following ramp closures:

? The northbound Highway 101 on-ramp from State Route 116 will be closed Monday night through Thursday night from 10 p.m. to 5 a.m.

? The northbound U.S. 101 off-ramp to Petaluma Boulevard South will be closed Monday and Wednesday nights from 9 p.m. to 6 a.m.

Caltrans also plans to reopen the northbound U.S. 101 on-ramp at Petaluma Boulevard South on Friday.

For more information about the project, visit or call the message line at (707) 781-2245.