San Francisco News: Westbound I-80 to Close October 23–26 Between Fifth and 15th Streets

Featured photo: San Francisco skyline and Bay Bridge by Tyler Casey / Unsplash. Illustrative only; not a view of the October 23–26 Bayshore Freeway closure.

SAN FRANCISCO NEWS | SAN FRANCISCO COUNTY — OCTOBER 18, 2026. A full weekend closure is coming to a key San Francisco freeway. Caltrans says all westbound Interstate 80 lanes between Fifth Street and 15th Street on the Bayshore Freeway are scheduled to close from Friday, October 23, at 11 p.m. until Monday, October 26, at 6 a.m. Drivers should make alternate plans before entering the affected corridor.

Exactly what is closing?

The official advisory describes a westbound I-80 full closure along the central San Francisco viaduct segment between Fifth and 15th streets. This is not a closure of the entire Interstate 80 or the whole San Francisco–Oakland Bay Bridge. The restricted segment is part of the freeway approach and viaduct rehabilitation program near downtown San Francisco.

Which exit should drivers use?

Caltrans directs westbound drivers to take the Fremont Street exit. The Fifth Street exit is another option and is identified as the last exit before the closure limits. The department provides detour guidance for motorists who need to return to westbound I-80 or connect to Interstate 280. Travelers should use the official traffic advisory and current traffic signs, rather than selecting an unverified shortcut through city streets.

When will westbound lanes reopen?

The published reopening target is 6 a.m. Monday, October 26, depending on conditions and work completion. Caltrans says all construction schedules are weather-dependent. Drivers should confirm the reopening using Caltrans QuickMap or 511 San Francisco Bay before commuting Monday morning.

Why is the closure needed?

Crews plan to place a polyester-concrete layer on the Bayshore Freeway deck, as part of a larger rehabilitation program for the I-80 and US-101 viaducts. Caltrans notes that the structures are more than seven decades old and sustain intense traffic, weather exposure and seismic demands. The aim of these repairs is to slow deterioration and extend the useful life of the existing freeway infrastructure, rather than construct a new highway.

Who should plan ahead?

The disruption may affect weekend drivers arriving via the Bay Bridge, downtown visitors, people heading toward the Peninsula and airport-area routes, ride-hail drivers and businesses with scheduled deliveries. Commuters should be especially cautious about navigation apps that may not immediately reflect a full closure or changed detour pattern.

Separate work on US-101

Caltrans has also scheduled US-101 Hospital Curve construction for a different weekend, October 16–19, and another period in November. The October 23–26 westbound I-80 closure is a separate project and should not be confused with the US-101 notices. See San Francisco News’ earlier US-101 Hospital Curve report.

Where to verify updates

For the latest construction announcements, check the Caltrans San Francisco freeway rehabilitation page. For real-time conditions use Caltrans QuickMap and 511 Bay Area. Leave time for the freeway to reopen and for traffic patterns to normalize after the scheduled construction window.

Primary sources: Caltrans District 4 closure notice, September 23, 2026 and current project overview. Closure hours are announced schedules and could change.

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