Overview
- The crash happened shortly before 9 a.m. Saturday near the Irwindale Avenue on‑ramp when an eastbound semi jackknifed, drove over the concrete center divider and struck vehicles in the westbound lanes.
- Los Angeles County fire officials pronounced one woman dead at the scene and reported two people in critical condition, eight transported with minor injuries, and 22 people who declined transport; six of the injured were minors.
- CHP issued a SigAlert and closed all westbound lanes between Irwindale Avenue and the San Gabriel River (605) interchange while multiple eastbound lanes were also blocked, with reopening times not announced.
- The truck driver remained at the scene and is cooperating with investigators, and Target told reporters the rig was operated by a third‑party carrier; authorities said they will examine driver records, vehicle data and possible video evidence.
- Big‑rig median breaches often cause high‑energy, multi‑vehicle crashes and mass casualty responses, so investigators’ findings on cause, victim identities and any citations will shape safety and traffic outcomes for the region.