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San Francisco's 'Fab 4' freeway rebuild brings weekend closures through 2028

San Francisco's 'Fab 4' freeway rebuild brings weekend closures through 2028

Built World San Francisco, CA local

Caltrans is repaving four aging corridors (Highway 101, I-280, the Central Freeway and 19th Avenue) with full weekend shutdowns

Today: KQED reports on upcoming southbound closure

Overview

Updated 32 minutes ago

Caltrans is closing all southbound lanes of Highway 101 through San Francisco this weekend, the third full shutdown of the "Hospital Curve" since Labor Day. The work is part of a multi-year rebuild of four aging freeway corridors that will bring more weekend closures through 2028.

The roughly 70-year-old concrete is being replaced with pavement designed to last 40 years. For drivers, that means weekend closures affecting anyone traveling between the Peninsula, San Francisco International Airport and the East Bay, with detours onto city streets and Interstate 280.

Why it matters

Weekend drivers through San Francisco face full freeway closures through 2028 as Caltrans rebuilds four aging corridors at once.

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Key Indicators

44,900
Daily travelers on Fab 4 freeways
Approximate number of people who travel the four corridors daily.
4
Freeway projects in 'Fab 4' program
Highway 101 Hospital Curve, I-280, Central Freeway and 19th Avenue.
40
Years new pavement is designed to last
Continuous reinforced concrete pavement replacing 70-year-old roadway.
15.4
Lane miles of Highway 101 being rehabilitated
Between Candlestick Point and the Mission District, plus drainage and median work.

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People Involved

Organizations Involved

Timeline

September 2025 November 2026

8 events Latest: Today
Tap a bar to jump to that date
  1. Southbound 101 closes for final repaving weekend

    Upcoming Closure

    Second southbound closure, Nov. 6-9, replacing the originally scheduled Oct. 2-5 closure.

  2. Westbound I-80 closure planned

    Upcoming Closure

    All westbound I-80 lanes between 5th and 15th streets close Oct. 23-26 for joint construction.

  3. Southbound 101 closes for first southbound repaving

    Upcoming Closure

    All southbound lanes close between Cesar Chavez and 17th through Oct. 19. One northbound lane also closes.

  4. KQED reports on upcoming southbound closure

    Today Announcement

    KQED publishes details of the Oct. 16-19 southbound 101 closure and detours.

  5. Northbound 101 closes again

    Closure

    Second northbound closure of Hospital Curve, through Sept. 21, for continued repaving.

  6. Northbound 101 closes for Labor Day weekend

    Closure

    All northbound lanes between Cesar Chavez and 17th streets close through Sept. 7 for repaving.

  7. Major I-80 closure through San Francisco

    Closure

    Interstate 80 through San Francisco closes for major work, ahead of the Fab 4 projects.

  8. Hospital Curve rehabilitation begins

    Project Start

    Caltrans begins the US 101 Bayshore Freeway (Hospital Curve) rehabilitation project.

Scenarios

1

Southbound repaving finishes on schedule, no more Hospital Curve closures in 2026

Likely Resolves by Dec 15, 2026

Discussed by: Caltrans project updates

Crews complete the southbound repaving during the Oct. 16-19 and Nov. 6-9 closures. Caltrans reopens all lanes and moves to the next phase of the broader Fab 4 program. Drivers get a smoother southbound 101 with no further shutdowns this year.

2

Project timeline extends past 2028

Possible Resolves by End of 2028

Discussed by: Caltrans project page (current estimate: into 2028)

Crews find worse deterioration than expected, or weather delays push work. Caltrans revises the expected completion date for the Hospital Curve or other Fab 4 projects beyond 2028, meaning more closures in future years.

3

Additional northbound closures needed beyond the two completed

Unlikely Resolves by Q2 2027

Discussed by: Caltrans statements (northbound work completed after Sept. 21)

Inspection after the northbound repaving reveals sections that need more work, or the southbound work reveals issues affecting northbound lanes. Caltrans schedules additional northbound Hospital Curve closures in 2027.

Historical Context

2 moments from history that rhyme with this story — and how they unfolded.

October 1989

Loma Prieta earthquake (1989)

The 6.9-magnitude earthquake collapsed the Cypress Street Viaduct in Oakland, killing 42 people, and damaged San Francisco's Embarcadero and Central freeways. The quake exposed the vulnerability of the city's aging elevated freeways.

Then

The damaged Embarcadero and Central freeways were demolished rather than rebuilt, reshaping San Francisco's waterfront and removing two elevated structures from the city.

Now

The quake accelerated the end of San Francisco's elevated freeway era, with the city choosing surface boulevards over rebuilding. The remaining freeways, including 101's Hospital Curve, continued aging without major investment.

Why this matters now

The Hospital Curve and other Fab 4 corridors are the same generation of freeway infrastructure that the 1989 quake damaged elsewhere. Their current rehabilitation addresses decades of deferred maintenance.

2002-2013

Bay Bridge eastern span replacement (2002-2013)

After the 1989 quake damaged the Bay Bridge's eastern span, Caltrans spent over a decade and more than $6 billion building a replacement. The project involved years of closures, detours and construction on one of the Bay Area's busiest corridors.

Then

Drivers faced years of lane closures, overnight shutdowns and detours while the new span was built.

Now

The new eastern span opened in 2013 with seismic safety improvements, but the project's cost and duration became a cautionary tale for Bay Area infrastructure work.

Why this matters now

The Fab 4 program is another long-duration Bay Area infrastructure project where closures are spread over years. It shows the pattern of major Bay Area freeway work: extended timelines, weekend closures and heavy public communication.

Sources

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