Westbound Interstate 80 to Close This Weekend
Caltrans will shut down lanes between Fifth and Fifteenth streets for critical viaduct repairs starting Friday night.
Updated on Oct. 21, 2026 in Trucks
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Is this a good time for local road construction despite the resulting weekend traffic?
Caltrans will close all westbound lanes on Interstate 80 in San Francisco from Fifth Street to Fifteenth Street starting at 11 p.m. on Friday. The closure will remain in effect until 6 a.m. on Monday, Oct. 26.
Why it matters
The closure is required to facilitate deck repairs as part of the Fab 4 Rehabilitation Project Series. This work aims to extend the useful life of the freeway deck by laying new polyester concrete.
Crews will utilize polyester concrete for the viaduct deck repairs. The closure impacts the stretch of highway between Fifth and Fifteenth streets.
The players
Caltrans
The California Department of Transportation is the agency responsible for managing the state highway system and conducting major infrastructure repairs.
The details
Drivers will be detoured off the freeway at Fifth Street and redirected toward Harrison Street or Ninth Street. Officials warn that motorists should anticipate congestion on these surface roads throughout the weekend.
Timeline
Friday, 11 p.m.: Westbound Interstate 80 closure begins.
Monday, Oct. 26, 6 a.m.: Westbound Interstate 80 closure ends.
Roadmap
This project is part of a larger ongoing effort by state authorities to address aging infrastructure within the Fab 4 Rehabilitation Project Series. Such maintenance is essential to preserving long-term structural integrity and traffic flow across major urban corridors.
Commuters and freight operators should prepare for significant delays and potential rerouting during the weekend period. Following the posted detour routes to Harrison Street or Ninth Street will be necessary to navigate around the construction zone.
The takeaway
Travelers should plan for extra time if they must navigate near the downtown corridor this weekend. Checking local traffic apps before departing can help identify the most efficient routes around the closures.
Further reading
For more information on transit updates, view our San Francisco Trucks coverage.
More information
View the official detour maps for freeway construction provided by project officials.
Live Poll
Is this a good time for local road construction despite the resulting weekend traffic?
