Massive Gas Line Rupture Shuts Down 5 Freeway and Shakes Homes in Castaic

A high pressure gas line explosion turned a quiet Saturday afternoon into a scene of chaos for thousands of residents and travelers in northern Los Angeles County. On December 27 a 34 inch natural gas transmission line ruptured near Ridge Route Road and Pine Crest Place in Castaic. The force of the event was so intense that nearby residents reported their entire houses shaking and a sound so loud it was compared to a jet engine or a sonic boom.

🚗 Holiday Travel Nightmare on the I-5

The rupture occurred just after 4 p.m. right alongside the southbound lanes of the 5 Freeway. This is one of the most critical transit arteries in California and the timing could not have been worse for holiday travelers. Fearing a potential ignition or a larger secondary explosion the California Highway Patrol issued a SigAlert and shut down the freeway in both directions.

For nearly five hours traffic was brought to a near standstill for miles. Northbound drivers were diverted onto State Route 126 while southbound traffic was sent toward the Pearblossom Highway. Many families were left stranded in their cars for hours as they waited for gas company crews to isolate the line and stop the massive release of gas. It was not until 8 45 p.m. that the freeway was finally deemed safe enough to reopen.

🏠 Shelter in Place for 14,000 Residents

While the freeway was at a crawl the local community was under a strict shelter in place order. Approximately 14,000 residents were told to stay inside and close all windows and doors. Fire officials even instructed families to shut off their HVAC systems to prevent the smell of gas from being pulled into their homes. The "rotten egg" odor was so strong that people as far away as Porter Ranch and Sylmar reported feeling nauseous and dizzy.

Despite the initial reports of an "explosion" authorities later clarified that it was a high pressure rupture that sent a massive plume of dust and debris into the air. Fire crews used drones to monitor the situation from a safe distance as the gas was escaping at a pressure of 600 psi. Fortunately no injuries were reported and no fire ever broke out which emergency workers called a miracle given the proximity to the busy freeway.

🏞️ Landslides and Soil Stability Investigated

The exact cause of the rupture is still being analyzed but officials have a strong theory. While some initially thought it might be storm related SoCalGas officials confirmed that significant land movement was observed right near the break. It appears that shifting soil may have put too much pressure on the 34 inch pipe causing it to fail.

Governor Gavin Newsom was notified of the situation as the state’s Office of Emergency Services helped coordinate the massive response. Even though the leak was mitigated on Saturday night the smell of residual gas lingered in the area through Sunday. Crews remain on the scene today to repair the damaged section of the pipeline and ensure that the surrounding hillsides are stable enough to prevent another rupture in the future.