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Westbound I-80 through San Francisco closes for weekend repairs

Westbound I-80 through San Francisco closes for weekend repairs

Built World San Francisco, CA local

Westbound I-80 reopened early; US-101 repaving and Bay Bridge night work roll on

2 days ago: Northbound US-101 lane closes overnight near Cesar Chavez

Overview

Updated Yesterday

Westbound I-80 reopened at 3:32 a.m. Oct. 26, several hours ahead of schedule, after Caltrans laid a polyester concrete overlay on the 71-year-old Bayshore Freeway viaducts. The closure between Fifth and 15th streets had backed up traffic about 45 minutes from the Bay Bridge toll plaza on Saturday, Oct. 24.

The last southbound US-101 closure at Hospital Curve ran Nov. 6-9, with northbound lanes open and drivers sent to I-280; Caltrans scheduled reopening for 6 a.m. Nov. 9. Work in the corridor continues. A northbound US-101 lane closed overnight Nov. 9-10, eastbound I-80 overnight lane closures run through mid-December, and the Yerba Buena Island on-ramp to westbound I-80 shuts overnight Nov. 12-13 for a holiday wreath installation.

Why it matters

Drivers into San Francisco face weekend detours and overnight Bay Bridge lane closures through mid-December as Caltrans repairs four major freeways.

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Key Indicators

55
Hours of westbound I-80 closure
Friday 11 p.m. to Monday 6 a.m., Oct. 23-26.
45 min
Toll plaza to Fremont Street
Caltrans' estimate for westbound drivers on Saturday, Oct. 24, the first full day of the closure.
250,000
Daily Bay Bridge crossings
Cars crossing the Bay Bridge daily, per Caltrans.
4
Fab-4 rehabilitation projects
Major repair projects on SF's busiest freeways.
4
Eastbound I-80 lanes closed overnight
On the Bay Bridge, four lanes close Sunday through Thursday nights through mid-December.
1
Westbound I-80 lane open during wreath work
Lanes 2-5 close between the metering lights and the Yerba Buena Island tunnel, 11:30 p.m. Nov. 12 to 4 a.m. Nov. 13.

Voices

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People Involved

Pedro Quintana
Pedro Quintana
Caltrans spokesperson
Communicating closure details and detours
RK
Rob Kobal
Caltrans project manager
Overseeing I-80 rehabilitation work
LS
Lori Shepherd
Caltrans public information officer for San Francisco County
Urged drivers to plan ahead during the October westbound I-80 closure, which ended early on Oct. 26

Organizations Involved

California Department of Transportation (Caltrans)
California Department of Transportation (Caltrans)
State agency
Running the Fab-4 rehabilitation program

California's state transportation agency, responsible for building and maintaining the state highway system.
AC Transit (Alameda-Contra Costa Transit District)
AC Transit (Alameda-Contra Costa Transit District)
Public transit agency
Operating regular weekend transbay service during closures

The public bus agency serving the East Bay, including transbay routes to San Francisco.
San Francisco Municipal Transportation Agency
San Francisco Municipal Transportation Agency
Transportation agency
Supporting transit options during closures

San Francisco's transportation agency, operating Muni buses and light rail.

Timeline

April 2026 November 2026

10 events Latest: 2 days ago
Tap a bar to jump to that date

  1. Yerba Buena Island on-ramp to westbound I-80 closes overnight for wreath installation

    Upcoming Construction

    Caltrans closes lanes 2-5 on westbound I-80 between the metering lights and the Yerba Buena Island tunnel, and shuts the island's on-ramp to westbound I-80, from 11:30 p.m. Thursday to 4 a.m. Friday. Traffic from Treasure Island is detoured east toward Oakland and back through the toll plaza.

  2. Northbound US-101 lane closes overnight near Cesar Chavez

    Latest Construction

    Caltrans closed a northbound US-101 lane between Cesar Chavez Street and the eastbound I-80 connector from 9:30 p.m. Nov. 9 until 6 a.m. Nov. 10.

  3. Final southbound US-101 Hospital Curve closure begins

    Construction

    All southbound lanes between 17th Street and Cesar Chavez Street closed for the weekend; Caltrans scheduled reopening for 6 a.m. Nov. 9.

  4. Caltrans extends Bay Bridge overnight lane closures to mid-December

    Construction

    Four eastbound I-80 lanes will close Sunday through Thursday nights from 10 p.m. to 7 a.m. while crews install a platform for painting the lower deck.

  5. Westbound I-80 reopens through San Francisco ahead of schedule

    Construction

    Caltrans said all lanes and ramps reopened at 3:32 a.m., several hours before the planned 6 a.m. end of the weekend closure.

  6. First full day of westbound I-80 closure brings 45-minute backups

    Traffic

    Caltrans reported about 45 minutes from the Bay Bridge toll plaza to Fremont Street, with traffic spilling onto city streets. Officials expected similar delays on Sunday.

  7. Westbound I-80 through San Francisco closes for weekend construction

    Construction

    All westbound lanes between Fifth and 15th streets close from 11 p.m. Friday to 6 a.m. Monday.

  8. Southbound US-101 Hospital Curve weekend closure

    Construction

    Weekend closure of southbound US-101 between Cesar Chavez and 17th Street, Oct 16-19.

  9. Eastbound I-80 through San Francisco closed for weekend construction

    Construction

    55-hour closure of eastbound I-80 from 17th to 4th streets, April 17-20.

  10. Bay Bridge structural steel painting project begins

    Construction

    Caltrans launches painting and spall repairs on the Bay Bridge west span.

Scenarios

1

Fab-4 rehabilitation wraps on schedule

Likely Resolves by Q2 2027

Discussed by: Caltrans (the agency's stated plan)

All four Fab-4 projects complete as scheduled. The final US-101 Hospital Curve closure ran Nov. 6-9, and weekend closures end. The separate Bay Bridge painting project continues through 2031.

2

Schedule slips, more weekend closures added

Possible Resolves by Q1 2027

Discussed by: Caltrans (weather and construction conditions noted as variables)

Weather delays or construction complications push work past scheduled dates. Caltrans adds additional weekend closures in 2027 to complete the rehabilitation work, extending the disruption for drivers.

3

Disruption prompts shift to overnight work

Unlikely Resolves by Q2 2027

Discussed by: Local officials and transit advocates

The weekend closures cause enough congestion that city officials push Caltrans to shift more work to overnight hours, reducing full-weekend closures. This would extend the project timeline but reduce weekend disruption.

Historical Context

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

October 1989

Loma Prieta earthquake (1989)

The 6.9-magnitude Loma Prieta earthquake collapsed the Cypress Street Viaduct in Oakland and damaged the San Francisco-Oakland Bay Bridge, closing it for a month. The quake killed 63 people, many in the Cypress collapse.

Then

Bay Bridge closed for a month, forcing commuters onto BART and other routes.

Now

Led to a major retrofit program for Bay Area bridges and freeways, including the eventual replacement of the Bay Bridge east span.

Why this matters now

Showed how dependent the Bay Area is on its freeway and bridge network, and how disruptive closures can be.

April 2007

MacArthur Maze fire (2007)

A tanker truck fire collapsed a section of the MacArthur Maze interchange in Oakland, where I-80 and I-580 connect. The collapse severed a key link between the East Bay and San Francisco.

Then

Crews rebuilt the collapsed section in 26 days, reopening the interchange ahead of schedule.

Now

Demonstrated both the fragility of the region's freeway network and the speed possible with emergency funding and round-the-clock work.

Why this matters now

The MacArthur Maze carries I-80 traffic toward the Bay Bridge, the same corridor affected by the current Fab-4 closures.

2002-2013

Bay Bridge east span replacement (2002-2013)

Caltrans replaced the earthquake-damaged eastern span of the Bay Bridge, a project that took over a decade and cost roughly $6.5 billion. The new span opened in September 2013.

Then

The new span opened with a self-anchored suspension design, replacing the 1936 structure.

Now

Set a precedent for large-scale infrastructure projects in the Bay Area, with ongoing maintenance needs.

Why this matters now

The Bay Bridge remains a key focus of the Fab-4 program, with joint rehabilitation and steel painting work ongoing.

Sources

(13)
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KQED Caltrans Berkeleyside NBC Bay Area SFMTA ABC7 San Francisco SFGuide San Francisco Chronicle Caltrans Caltrans Caltrans Caltrans Caltrans