101 NB Central San Rafael Harbor Bridge Replacement
Contact: RocQuel Johnson
Phone: (510) 501-0446
MARIN – Caltrans District 4 (Bay Area), will continue construction work on Stage 2 of the Northbound (NB) US-101 Central San Rafael off-ramp bridge (Harbor Bridge replacement) in Marin County. Starting Friday morning, June 18, the construction team will conduct pile driving work from 6:00 AM until 9:00 PM.
Additionally, on Sunday, June 20, starting at 11:00 PM to Monday, June 21, ending at 6:00 AM, the construction team will be doing a full off-ramp closure to change the off-ramp configuration to implement the two-lane configuration. This new configuration will provide for one lane to the new temporary bridge, and one lane to the existing off-ramp.
This two-lane configuration will remain in place until the end of July 2021, so that the construction team can continue work on Stage 2 of this bridge replacement project.
One Night Full Off-Ramp Closure:
Beginning Sunday, June 20 at 11:00 PM to Monday, June 21 at 6:00 AM.
Detours are in place to assist motorists traveling in the area.
Project Fact Sheet
This project proposes to replace structurally deficient existing 101 NB Central San Rafael Off-Ramp Bridge with a new bridge with minor realignment but with widened shoulders. This project also proposes improvements at the 2nd and Irwin street intersection.
Project StatusProject is currently in the Construction phase. The Environmental phase was completed on 7/7/17. The Design phase was completed on 8/2/19. The project was awarded to Gordon N. Ball Inc. on 5/5/20.
Project CostsThe programmed construction cost is $14.7 million.
Project ScheduleStart Construction: Spring 2021 Finish Construction: Winter 2021
There are three non-consecutive 55-hr weekend closures for the various stages of construction:
- Stage 1 Weekend Closure – 10PM, March 19, 2021 to 5AM, March 21, 2021 – Drive 23-24” dia. CISS piles along Abutment 1, Abutment 3 and temporary abutment.
- Stage 2 Weekend Closure – TBD – Drive 2-24” dia. CISS piles along Abutment 1, 3-24” dia. CISS piles along Abutment 3 and 6-36” dia. CISS piles along Pier 2.
- Stage 3 Weekend Closure – TBD – Install permanent sheet piles between Abutment 1 and Pier 2, driving 6-36” dia. CISS piles along along Pier 2.
ConstructionProject will use Accelerated Bridge Construction (ABC) method to significantly reduce the time needed to complete the project compared to the conventional methods. Nightly ramp lane closures and some full off-ramp closures will be implemented in between the three non-consecutive 55-hr weekend full off-ramp closures as well as various traffic switches to complete the bridge construction.