Westbound I-580 reopens at Altamont Pass after big-rig fire leads to shutdown
Westbound Interstate 580 at the Altamont Pass reopened Friday, hours after an big-rig fire led to a closure of the freeway for nearly the entire morning commute.
According to firefighters, the 18-wheeler caught fire in the westbound direction near Grant Line Road shortly before 6 a.m. and had spread into nearby vegetation. Crews with Cal Fire along with the Alameda County Fire Department responded to the scene.
On Friday, July 18, 2025, the Alameda County Fire Department (ACFD), in unified command with Cal Fire, on scene of an 18-wheeler that caught fire on WB 580 east of Flynn/Grantline Road.
— Alameda County Fire (@AlamedaCoFire) July 18, 2025
The fire spread to the vegetation.
Forward progress has been stopped. WB lanes closed. pic.twitter.com/oQosgfVScF
Forward progress of the fire was stopped by 6:40 a.m., but westbound lanes of the freeway, a major artery connecting the Bay Area and the San Joaquin Valley stayed closed. At the height of the closure, the backup on westbound Interstate 580 stretched several miles to the Highway 132 interchange, while westbound Interstate 205 was backed up into Tracy.
Around 8:50 a.m., the Dublin office off the California Highway Patrol posted a picture of the freeway, saying they were working to reopen at least one lane soon.
Current photo. WB I-580 at the Altamont Pass. Working to open up a lane soon. Thanks for patience. pic.twitter.com/hImuodItw4
— CHP Dublin Area (@CHPDublin) July 18, 2025
By 9:10 a.m., the left lane of westbound 580 had reopened. Meanwhile, the right and center remains remained closed. A second lane was reported open around 9:45 a.m.
The cause of the fire is under investigation.