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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.

Caltrans will continue construction on the northbound U.S. 101 Bayshore Freeway (Hospital Curve) between Cesar Chavez and 17th St. in the City of San Francisco during the weekend of September 18-21. This work requires the closing of all northbound lanes and one southbound lane.

The closures will begin Friday, September 18 at 11 p.m. and will last until Monday, September 21 at 6 a.m.

All northbound U.S. 101 lanes and one U.S. 101 southbound will be closed the entire weekend. Three southbound lanes will remain open. These closures continue the essential major pavement repair work required for long term roadway rehabilitation.

These lane closures are the second of six-weekend freeway closures required to complete major pavement repair work as part of the ongoing Fab 4 Hospital Curve Rehabilitation Project, which began in Fall 2025. Work crews will conduct 24/7 operations during each closure weekend to ensure timely structural improvements.

Upcoming Weekend Closure Details:

October 2-5 (Third Closure)

The full highway closure will begin on Friday, October 2 at 11 p.m., when all southbound lanes between Cesar Chavez Street and 10th Street will close. All lanes will reopen by Monday, October 5 at 6 a.m.

During this period:

  • All northbound lanes will remain open for public travel.
  • Motorists should avoid driving southbound 101 (Hospital Curve) due to anticipated delays.
  • Use NB I-280 as an alternate route.

October 16-19 (Fourth Closure)

The last closure weekend for Hospital Curve will take place Friday, October 16 at 11 p.m. through Monday, October 19 at 6 a.m.

The same traffic reduction configuration will apply:

  • All southbound U.S. 101 lanes closed. All northbound lanes will remain open.

US 101 Bayshore Freeway (Hospital Curve) Detour Map for Northbound Closures from Cesar Chavez St to past 17th St. Last exit detour at Cesar Chavez St and Potrero Ave, NB US-101; 9th St / Bryant On-ramp; redirect to I-280. I-280 N to Bay Bridge Detour: I-280 S to 19th Ave or Monterey Off-ramp to San Jose to Guerrero 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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