Castaic, California, experienced significant disruptions Saturday afternoon following a gas line explosion that led to substantial freeway closures and shelter-in-place directives in nearby areas. The incident unfolded shortly after 4 p.m., prompting immediate emergency responses from local authorities.
The California Highway Patrol (CHP) issued a Sigalert at 5:03 p.m. due to the explosion, which resulted in the complete shutdown of both northbound and southbound lanes of Interstate 5 between the Lake Hughes Road and Lower Crossover exits. Motorists were rerouted, with northbound vehicles redirected to Highway 126 and southbound traffic directed to State Route 138. By 8:44 p.m., the CHP had lifted the closure, allowing traffic to resume in both directions.
In conjunction with the highway closures, the Los Angeles County Fire Department implemented a shelter-in-place order for the CAS-SLOAN area at 5:40 p.m. This directive covered a defined region bordered by the Ninetynine Oaks community to the south, Castaic Town Center to the north, Interstate 5 to the west, and Sloan Canyon Road to the east. Another shelter-in-place order was enacted around 6:45 p.m. for the Stonegate neighborhood, situated east of I-5.
Authorities indicated that the blast was likely caused by a natural gas line rupture, which remains under investigation. Gas service in the immediate vicinity was suspended on Saturday night to prevent further hazards. Reports confirmed that residents across the Santa Clarita Valley, including areas as far away as Westridge in Valencia and Stevenson Ranch, detected the smell of gas following the incident.
Initial scene reports suggested the rupture occurred near the 3200 block of Ridge Route Road, although this location has not been definitively established. Emergency services, including L.A. County Fire units, were dispatched to North Ridge Route Road and Pine Crest Place just after 4:17 p.m., following the first 911 call about a potential explosion received at 4:19 p.m.
While no injuries were immediately reported, the fallout from the explosion created substantial travel delays, affecting both Ventura and Los Angeles counties throughout the evening. Local residents remain on alert as investigations continue and safety measures are enforced.