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San Francisco US-101 Rehabilitation

Banner image for the San Francisco freeway rehabilitation projects, four will rehabilitate San Francisco’s major freeway arteries, referred to as the Fab 4 Rehab projects. The Fab 4 includes the Bayshore and Central freeways US-101 and I-80, the entire 19th Avenue (SR-1), and the pedestrian overcrossing on the I-280 near Cayuga Park

Project Media Gallery

Additional project resources including downloadable maps, image galleries, and video clips can be found on the media resources page.

What’s Happening?

Map of Fab 4 US 101 Rehabilitation Project/Hospital Curve from Candlestick Point through Hospital Curve.

The U.S. 101 (Hospital Curve) Rehabilitation Project will begin Fall 2025. It is a two-year effort to improve 15.4 lane miles of concrete pavement and upgrade drainage systems and median barrier on U.S. 101 between Candlestick Point Recreation Area and the Mission District in San Francisco. The project is expected to be completed in 2028.

When Is This Happening?

This project will be carried out in three focused segments:

Segment 3: Starting in October 2025, work will begin with traffic lanes in both directions shifted and the outside shoulder closed to allow for the replacement of drainage systems. This segment is expected to be completed by early 2028.

Segment 2: Beginning in Fall 2026 and continuing through late Spring 2027, work will focus primarily on the center median. Activities will include drainage system upgrades, replacement of the median barrier, and some isolated concrete pavement slab repairs.

Segment 1: Scheduled to begin in Spring 2027 and conclude in Fall 2027, this section will also involve work in the center median for drainage system upgrades and median barrier replacement, along with isolated concrete pavement slab repairs.

Why is This Necessary?

The concrete pavement in the project limits is reaching the end of its service life. The center medians are heavily damaged with visible fractures and cracks and must be modernized. Furthermore, this project will extend the lifespan of this 70-year-old roadway which will minimize the need for frequent repairs and will reduce future disruptions to commuters.

What about traffic impacts?

Lane reductions are necessary to create space for work activities. This project is located along sections where there is very limited shoulder access. Speed reduction is crucial for worker and motorist safety. The posted speed limit will be reduced. Most of the work will occur at night and on weekends, but motorists should plan extra time during the peak commute hours from approximately 6:00 AM to 10:00 AM and 3:00 PM to 7:00 PM.

Driver Benefits

Included in the rehabilitation will be re-paving of freeway on- and off- ramps, new signage, striping, and safety devices. The medians will be smoother and safer. With the completed project, motorists will experience a noticeably smoother driving experience with fewer rough patches and road bumps and roads less likely to flood.

Schedule

Construction began 2025 and is currently underway – 2 years duration

This work is weather dependent.

All southbound lanes of the U.S. 101 Bayshore Freeway (Hospital Curve) (and one northbound lane) will be closed from Friday October 16, 11 pm. to Monday October 19, 6 a.m. to complete the repaving of all southbound lanes between Cesar Chavez and 17th St. Motorists are advised to avoid area and use the SB I-280 freeway or use an alternate route.

This third closure to repave the U.S. 101 Bayshore Freeway is part of the broader U.S. 101 Bayshore Freeway (Hospital Curve) rehabilitation project which began in Fall of 2025. This weekend's work begins the first of two weekend closures on the freeway to repave the southbound lanes of the freeway. Caltrans returns in November to complete the southbound lanes repaving.

Upcoming Weekend Closure Details:

October 16-19 (Third Closure)

  • The third full closure weekend for Hospital Curve will take place Friday, October 16 at 11 p.m. through Monday, October 19 at 6 a.m.
  • All southbound U.S. 101 lanes closed. One northbound lane will be closed and remaining lanes open.

November 6-9 (Fourth Closure)

  • All southbound U.S. 101 lanes closed. One northbound lane will be closed and remaining lanes open.

Note: the November 6-9 closure is a replacement of the October 2-5 closure originally scheduled.

Detour Information

For detour information during these closures, please go to the U.S. 101 Bayshore Freeway (Hospital Curve) rehabilitation Detour page.

Weekend Closure. Connector Closures take westbound Interstate 80 to northbound U.S. 101 and southbound U.S. 101 (Central Fwy) to SB-101 Connector/Mainline. Ramps Closures WB-80 4th St onramp, WB-80 7th St onramp, EB-80 7th St offramp (for trucking), and NB-101 10th St onramp. Detour routes from 5th St offramp from WB-80 take Harrison to 6th St, left on 6th St, SB-280 onramp then either continue SB-280 to SB 101 or SB-280 Pennsylvania Ave offramp, Right turn on C Chavez St then SB-101 onramp from C. Chavez St. Detour routes from 8th St (signed 9th St) offramp from WB-80. Take Harrison to 10th St, left on 10th St, continue onto Potrero St then take SB-101 onramp from Portero St.

 

Cars traveling on U.S. 101 (Hospital Curve).

Current Advisories

Project Media Gallery

Additional project resources including downloadable maps, image galleries, and video clips can be found on the media resources page.

Contact

For real-time traffic, click on Caltrans QuickMap: https://quickmap.dot.ca.gov/
For 24/7 traffic updates, follow 511.org: https://x.com/511SFBay

For more information contact:

Lori Shepherd
Public Information Officer
San Francisco County CALTRANS - District 4

Thank you for your patience as we work to improve our roads and infrastructure.

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