Fatal Semi-Truck Crash Shuts Down I-10 at I-15 Interchange in Ontario

ONTARIO, Calif. (VVNG.com) — A fatal traffic collision involving two semi-trucks shut down the westbound I-10 freeway at the I-15 interchange Tuesday afternoon, October 21, 2025, prompting a SigAlert and major traffic disruptions, according to the California Highway Patrol.

The crash occurred at approximately 1:14 p.m. near the transition ramps in Ontario. CHP dispatch logs indicated multiple vehicles were involved, including two big rigs, one of which caught fire after the collision.

Witnesses reported that one of the semis was braking but couldn’t stop in time, crashing into another semi. A third vehicle may have been struck between them, though this remains under investigation.

Flames were seen coming from the gas tank of one of the trucks. Firefighters responded swiftly to extinguish the blaze. Four lanes were initially blocked. One person was transported to Pomona Valley Medical Center with major injuries, and at least one fatality was confirmed at the scene.

SigAlert and Full Freeway Closures

By 1:30 p.m., CHP issued a SigAlert and confirmed that all mainline lanes of westbound I-10 at the I-15 were closed for an unknown duration. Specific closures included:

• Southbound I-15 to westbound I-10 – CLOSED
• Northbound I-15 to westbound I-10 – CLOSED
• Westbound I-10 at I-15 – ONLY EXPRESS LANES OPEN

Caltrans was contacted to assist with hard closures and traffic diversion.

A live traffic map shows significant congestion throughout the surrounding area. Traffic is heavily impacted on Ontario Mills Parkway, East Airport Drive, and northbound Milliken Avenue, with severe delays extending eastward on Valley Boulevard and San Bernardino Avenue, and west toward Haven Avenue.

Motorists traveling in or near Rancho Cucamonga, Ontario, or Fontana are advised to expect major delays and avoid the area if possible. Southbound I-15 remains congested as far back as Jurupa Street, with a moving closure zone noted near Mission Boulevard.

The cause of the crash remains under investigation, and the identity of the deceased has not yet been released.

This is a developing story and additional information will be updated as it becomes available.

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