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San Francisco Freeway & Road Rehabilitation

Upcoming Full Weekend Closures

Full Weekend Closures on Northbound U.S. 101 Bayshore Freeway (Hospital Curve) September 18-21

Caltrans construction is closing northbound U.S. 101 Bayshore Freeway (Hospital Curve) between Cesar Chavez and 17th St. in the City of San Francisco. Starting Friday, September 18 at 11 p.m. through Monday, September 21 at 6 a.m. through Monday, September 21 at 6 a.m.

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

These lane closures are necessary 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 2-4 (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 4 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 I-280 as an alternate route.

October 16-18 (Fourth Closure)

The last closure weekend for Hospital Curve will take place Friday, October 16 at 11 p.m. through Monday, October 18 at 6 a.m.

The same traffic reduction configuration will apply:

  • All Southbound U.S. 101 lanes closed. All Northbound lanes will remain open. 

For more information on this project visit:

San Francisco US-101 Rehabilitation | Caltrans

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.

Project Media Gallery

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

Traffic Advisories

Exciting changes are underway on San Francisco’s roads and freeways, specifically on the I-280, the U.S. 101 Hospital Curve, the Central Freeway, and SR-1 (19th Avenue). We call them the Fab 4! Each project is receiving major repaving and rehabilitation, helping create safer, smoother driving experiences for everyone who drives to, from, and in and around the San Francisco Bay Area. Work is progressing on the U.S. 101 Hospital Curve of the Bayshore freeway, and on the U.S. 101 Central freeway. The I-280 Farallones pedestrian overcrossing and rehabilitation work begins in Summer 2026. And the 19th Avenue rehabilitation is near completion!

These rehabilitation projects will provide extensive repairs and upgrades to restore the structural integrity and enhance the safety of San Francisco’s most used freeways by motorists, where approximately 44,900 people travel daily.

To learn more about these projects, visit Welcome to the Fab-4 Rehabilitation Projects Toolkit | Caltrans.

Photo of San Francisco buildings form the skyline.

Current Projects

San Francisco-Oakland Bay Bridge: Upcoming Lane and Ramp Closures

Friday (09/11/2026) Night

  • Eastbound I-80
    • Lane 2 — (San Francisco Anchorage Rincon Hill to Yerba Buena Island Tunnel) — 3:00 AM to 5:00 AM
    • Lane 3 — (San Francisco Anchorage Rincon Hill to Yerba Buena Island Tunnel) — 1:00 AM to 6:00 AM
    • Lane 4 — (San Francisco Anchorage Rincon Hill to Yerba Buena Island Tunnel) — 12:00 AM to 2:00 PM
    • Lane 5 — (San Francisco Anchorage Rincon Hill to Yerba Buena Island Tunnel) — 11:00 PM to 8:00 AM
  • E/B I 80 Sterling Street On Ramp Closed
    • Sterling Street On Ramp — (Sterling Street to Eastbound I 80) — 2:00 AM to 8:00 AM

Saturday (09/12/2026) Daytime & Night

  • No lane closures scheduled.

Sunday (09/13/2026) Daytime

  • No lane closures scheduled.

Sunday (09/13/2026) Night

  • Westbound I-80 Lanes to close
    • Lane 1 — (Tower to Tower 2) — 10:00 PM to 5:00 AM
    • Lane 2 — (Tower to Tower 2) — 10:00 PM to 5:00 AM
    • Lane 3 — (Tower to Tower 2) — 11:00 PM to 4:00 AM
  • Eastbound I-80 Lanes to close
    • Lane 2 — (San Francisco Anchorage Rincon Hill to Yerba Buena Island Tunnel) — 1:00 AM to 5:00 AM
    • Lane 3 — (San Francisco Anchorage Rincon Hill to Yerba Buena Island Tunnel) — 12:00 AM to 6:00 AM
    • Lane 4 — (San Francisco Anchorage Rincon Hill to Yerba Buena Island Tunnel) — 11:00 PM to 7:00 AM
    • Lane 5 — (San Francisco Anchorage Rincon Hill to Yerba Buena Island Tunnel) — 10:00 PM to 7:00 AM
  • Eastbound I-80 Sterling Street On-Ramp to Close
    • Sterling Street On-Ramp (Sterling Street to Eastbound I 80) — 11:00 PM to 7:00 AM

Monday (09/14/2026) Daytime

  • Eastbound I-80 Lanes to close
    • Lane 1 — (Pier 1 to Yerba Buena Island Tunnel) — 7:00 AM to 2:00 PM
Caltrans working on the San Francisco Bay Bridge for the San Francisco-Oakland Bay Bridge Joint Rehabilitation Project.

San Francisco-Oakland Bay Bridge Joint Rehabilitation Project*

Project Schedule — through 2027

*Motorists should expect lane closures occurring overnight on the EB I-80 San Francisco-Oakland Bay Bridge throughout the project. Closures will usually start with closing one lane at 10:00 pm., two lanes at 11:00 p.m., and three lanes at midnight. With a few exceptions when work is delayed or postponed for major local event traffic, lane closures will be in effect from Sunday to Thursday nights.

Advisories

The San Francisco-Oakland Bay Bridge Structural Steel Painting & Spall Repairs

Project Schedule — through Spring 2031

Advisories

A view of the new San Francisco-Oakland Bay Bridge East Span.

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

Map showing locations of San Francisco Central Freeway Rehabilitation projects.

Caltrans has launched a major effort to revitalize San Francisco’s most used roads and freeways. We refer to them as the Fab-4 Rehab projects which will create safer and smoother driving experiences in and around San Francisco. Two of these projects are taking place along the Bayshore and Central freeways US-101 and I-80. A third project will be the repaving of the entire 19th Avenue (SR-1) between the Golden Gate Park and San Francisco State University. And the fourth project is the rebuilding of an outdated pedestrian overcrossing on the I-280 near Cayuga Park.

Please read more below about each project. Visit here to learn more about these four important projects: Welcome to the Fab-4 Rehabilitation Projects Toolkit | Caltrans

Current Fab-4 Projects

19th Avenue Repaving, on SR-1

Caltrans pouring concrete as work continues on the19th Avenue Paving and Rehabilitation project.
Image from work on the 19th Avenue Paving and Rehabilitation Project

Cars on 19th Avenue traffic as Caltrans continues the19th Avenue Paving and Rehabilitation project.
Image of completed work on the 19th Avenue Paving and Rehabilitation Project

 

Advisories

San Francisco US-101 (Hospital Curve) Rehabilitation — Construction Underway

  • This work is weather dependent.

Advisories

Caltrans cutting concrete on US 101 as part of the U.S. 101 (Hospital Curve) Rehabilitation Project.
Image of work on the San Francisco US-101 Rehabilitation Project

 

Bridge Rehabilitation of Central (US 101) and Bayshore (I-80) Viaducts — Construction Underway.

Upcoming Lane and Ramp Closures

Central/Bayshore Freeway Overnight Lane Closures

To support ongoing construction and safety improvements, overnight lane closures will continue through October 2026 on the Central/Bayshore Freeway. Work is scheduled nightly from 10:00 p.m. to 6:00 a.m.

Lanes 1 and 2 between US 101 and the 4th Street/Bryant off ramp will be closed, leaving one lane open for traffic. Drivers should expect reduced speeds, possible delays, and shifting traffic patterns through the work zone.

Check back for the latest lane closures.

Caltrans appreciates the public’s patience as crews work to maintain and improve Bay Area highways.

Advisories

I-280 Farallones Street Pedestrian Overcrossing and Rehabilitation Project

Public Meeting Information

Future meetings to be scheduled

FAQ

Here’s a copy of our project’s FAQ sheet, created so you can easily save or reference the key information whenever you need it. If you’d like to download or view the full fact sheet, please click the link below.

Upcoming Lane and Ramp Closures

Advisories

Project Media Gallery

Emergency Barrier Repairs, US-101 & US-80

Additional project resources including downloadable maps, image galleries, and video clips can be found on the Emergency Barrier Repair Project Media Resources Page.

San Francisco-Oakland Bay Bridge Joint Rehabilitation Project

Additional project resources including downloadable maps, image galleries, and video clips can be found on the San Francisco-Oakland Bay Bridge Joint Rehabilitation Project Media Resources Page.

Completed Projects

San Francisco County Completed Projects (from 2024 to present)

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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