I-80 Closure Could Snarl Traffic Through San Francisco This Weekend: What to Know
Drivers heading into San Francisco from the Bay Bridge over the weekend are likely to run into massive traffic delays — due to yet another round of closures and ongoing roadwork.
Starting Friday at 11 p.m., Caltrans is shutting down all westbound lanes of Interstate 80, also known as the Bayshore Freeway, from Fifth to 15th streets.
The road won’t open until Monday at 6 a.m.
The 55-hour closure is the latest in a series of road repair and reconstruction that has swept major arteries in San Francisco, including Interstate 280, U.S. Route 101 and 19th Avenue on the city’s west side, which is also State Route 1.
“We understand there’s never a good time to close a major freeway,” Caltrans spokesperson Pedro Quintana said. “We understand that, but we need to get this work done.”
People traveling through the city this weekend should have a game plan, he added, and prepare to either take public transit or be ready for major detours to get around this closure.
Keep reading for what to know about the I-80 closure and how it could affect your weekend. (And if you know someone heading to San Francisco International Airport by car this weekend to catch a flight, send this to them too.)
- Jump straight to: How much could the Bay Bridge be affected by the I-80 closure?
What part of I-80 will be closed this weekend?
All lanes of westbound I-80 between Fifth and 15th streets will be closed Oct. 23-26. The last exit for motorists will be the Fifth Street off-ramp.
Drivers will see California Highway Patrol vehicles blocking all lanes and redirecting traffic to the Harrison/Embarcadero and Fifth Street exits.
Eastbound lanes on I-80 leading to the Bay Bridge and the East Bay will remain fully open.
When exactly will the I-80 closure start and end?
The westbound I-80 Bayshore Freeway closure is scheduled to begin at 11 p.m. Friday, Oct. 23 and end at 6 a.m. Monday, Oct. 26.
The schedule is subject to weather and construction conditions.
Drivers should check Caltrans announcements for any changes before setting out — or adjust their plans to include public transit.
What’s the reason for the I-80 closure?
This latest closure is part of what Caltrans calls “The Fab-4” rehabilitation project series — four separate major repair projects impacting high-use freeways in San Francisco.
Crews will be adding a polyester overlay on top of the roadway and bridge decks that are constantly driven over, “to make sure that they’re resilient for the next 40 years,” said Caltrans’ Quintana.
How much could the Bay Bridge be affected by the I-80 closure?
Caltrans warned that both decks of the Bay Bridge in and out of the city will have “massive traffic delays,” as drivers adjust their routes and use alternate streets and freeways.
Quintana said drivers can expect 20-30 minute delays — at the very least.
The extent of any backups will depend on traffic volumes, the timing of trips and how many motorists follow recommended detours.
What detours and alternative routes are recommended during the I-80 closure?
For those approaching the city of San Francisco and hoping to head south or east, your main options include:
- To reach Highway 101: Take the Fifth Street exit and continue on Harrison Street. That will put you on a straight shot to 10th Street, where you can continue to the southbound 101 on-ramp.
- To reach Van Ness Avenue: Continue on Harrison Street and turn right onto Ninth Street. Then, turn left onto Hayes Street and then right onto Van Ness Avenue heading northbound. You can also continue past Van Ness Avenue onto U.S. 101 South by turning left onto Gough Street, right onto Fell Street and left onto Octavia Boulevard.
- To reach I-280: Drive along Harrison Street, take a left onto Sixth Street and then continue south to the I-280 on-ramp.
Those with extra time on their hands can try alternative routes across the Richmond-San Rafael, San Mateo or Dumbarton bridges.
But travelers who can avoid driving may be able to bypass the bottlenecks by using regional public transit.
Who will be most affected by the I-80 closure?
Roughly 250,000 cars cross the Bay Bridge daily, Quintana said.
While he emphasized that everyone driving into San Francisco will run into detours and heavy traffic, the following travelers will likely be most affected:
- People heading across the Bay Bridge to and from the East Bay
- Travelers heading south to SFO Airport.
Since the westbound I-80 closure will last until 6 a.m. on Monday, Oct. 26, the earliest commuters traveling on the Bay Bridge and through the city that morning could find themselves affected by the final hours of the closure.
Will public transit be affected by the I-80 closure?
Robert Lyles, spokesperson for AC Transit, said weekend transbay bus lines are expected to operate on their regular schedules.
“We closely monitor daily roadway conditions and any potential impacts on service delivery. Should weekend construction affect our bus network, we will use our established channels to broadly keep riders informed of any changes or disruptions,” Lyles said in an email.
Quintana said he expects transit agencies to see a boost in ridership, as they did in the spring when eastbound I-80 was closed for similar repairs.
Michael Roccaforte, a spokesperson for the San Francisco Municipal Transportation Agency, said parking control officers will assist with traffic control to keep the surface streets moving safely.
“For people heading to Chase Center to watch the Valkyries in the WNBA finals and other events during the closure period, we encourage them to take Muni and plan ahead,” Roccaforte said in an email. “The T Third makes for an easy connection between Powell BART and Chase Center with a trip that’s now up to 14% faster thanks to the T Third Improvements project. And a ticket to any Chase Center event covers your Muni fare for the full day.”
What public events are happening in the Bay Area that weekend that could be affected by the I-80 closure?
There will be multiple events taking place at Chase Center and throughout the city this weekend that could be affected by the closure, including:
- Golden State Warriors home opener: The Dubs will face off against the Memphis Grizzlies at Chase Center at 7 p.m. on Friday.
- The Valkyries Official Finals Watch Parties: Ballhalla will turn up in violet at Chase Center for all WNBA Finals away games, with Game 4 of the series starting Saturday at 10 a.m.
- Doja Cat: The quirked-up rapper and R&B singer will perform at Chase Center Sunday at 7:30 p.m.
Fans driving to Mission Bay should check traffic and parking conditions before leaving — or consider public transit.
Outside of Chase Center, attendees of other events in the city may want to take heed of the closures, including:
- Lower Polk Live! street festival: A free celebration of music, art and community returns to Polk Street with DJ sets and local bands.
- Lit Crawl 2026: The world’s largest literary pub crawl through San Francisco’s Mission District caps off the annual Lit Quake Festival.
- Early Halloween events: Spooky events are planned throughout the Bay Area this weekend with haunted fun and festivities.
Why is this closure taking place over this weekend?
Quintana said the weekend was carefully chosen with local partners to minimize disruptions and avoid major events.
Construction is also needed, he said, ahead of a heavy storm season incoming according to record-breaking El Niño predictions. Crews helped install a new drainage system on 101, and roads have been smoothed and improved across the 101 corridor.
“We’re just asking folks, again, to have a game plan, work with us and be patient,” Quintana said.
Finally, what’s next in terms of San Francisco road closures?
A fourth and final weekend closure to complete the remaining southbound 101 Bayshore Freeway project is scheduled for Friday, Nov. 6 to Monday, Nov. 9.
Drivers should avoid driving southbound 101 due to heavy delays and use I-280 as an alternative route.
KQED’s Joni Binder contributed to this report.