RESCHEDULED: Ramp, Lane Closure Scheduled Overnight as 101 NB Central San Rafael Harbor Bridge Replacement Continues in Marin County


Ramp closure Tuesday, September 27 and Thursday, September 29

MARIN COUNTY — Caltrans is continuing the Harbor Bridge Replacement Project in September and October for pavement and electrical work on the northbound 101 off-ramp to Central San Rafael. The project started in February 2021, and on Dec. 11, 2021, was suspended due to environmental regulations for in-creek work.

There is a full off-ramp closure of the Central San Rafael exit on US-101 northbound on Tuesday, September 27, and Thursday, September 29, from 11 p.m. until 7 a.m. each day due to drainage and curb ramp work.

The work was originally slated for the week of September 19 but had to be rescheduled due to a lack of resources.

Primary detour
Continue on northbound US-101 and take the northbound loop off-ramp to San Pedro Road
Take a right on Merrydale Road Get on the 101 southbound onramp
Take 101 south to Mission Avenue Continue onto Hetherton Street
Take a left on 2nd Street

Secondary detour
From northbound US-101, take the Francisco Boulevard exit
Take a right on Bellam Boulevard
Take a left on Francisco Boulevard
Take a right on Grand Avenue

Image showing the area affected by the lane closures for the Harbor Bridge Replacement Project on the northbound 101 off-ramp to Central San Rafael, Marin County.A lane closure is scheduled from Monday, September 26 until Friday September 30 from 9 p.m. until 7 a.m. each day. Upon exiting the Central San Rafael off-ramp, one lane (out of three) will be closed during construction; the other two lanes will remain open at all times.

Work on the intersection improvements started in May 2022 while in-creek work resumed in June 2022 to complete the western portion of the new bridge and switch to the final traffic configuration. The deck of the western portion of the new bridge and the bridge approach slab have been completed. The project is expected to be completed as early as the fall of 2022.

Changeable message and directional signs will be in place to assist motorists traveling in the area. The California Highway Patrol (CHP) will be on-site during the closures.

Please drive with caution. Slow for the Cone Zone and Be Work Zone Alert. Caltrans thanks motorists for their patience while we work to maintain our state's highways, bridges, and tunnels.

Additional project information is available at:
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