Sunday plans for a quick cruise into Yosemite turned into a hard stop when a rockslide dumped roughly 100 cubic yards of rock and debris across both lanes of State Route 140 in Mariposa County, shutting the main highway into the park and cutting off entry at the Arch Rock (El Portal) approach. Crews managed a brief midday reopening, but continued rockfall activity forced officials to close the highway again by evening, sending visitors and local businesses scrambling for alternate ways into the valley.
What Caltrans and CHP say
Caltrans spokesperson Anthony Presto told SFGATE the slide hit at about 9 AM near the community of Incline, with crews estimating the debris pile at roughly 100 cubic yards. The highway briefly reopened around noon, but Caltrans and the California Highway Patrol put a full closure back in place at 7:00 PM while geotechnical and highway operations staff assess the slope and pavement for additional hazards, Presto said.
Park access and alerts
The National Park Service posted an alert on its current conditions page stating that El Portal Road, which continues Highway 140 into the park, is closed outside the park from Cedar Lodge to Yosemite Bug because of the rockslide, according to the National Park Service. The agency notes that some roads inside Yosemite Valley remain open, but the Arch Rock approach from the west is not passable, and urges visitors to monitor the park's conditions page for the latest updates.
Why this corridor keeps failing
The slopes lining the Merced River canyon that SR-140 threads through are naturally prone to blocky rockfalls and repeat re-activations, a pattern the U.S. Geological Survey documented in its study of the 2006 Ferguson rock slide, according to the USGS. Heavy storms and wet seasons have repeatedly triggered instability in the narrow canyon, and a major slide in March 2025 closed the same stretch and required weeks of repairs, reporting shows. Long-term fixes typically involve slope stabilization and ongoing monitoring before the route can be relied on during high-flow seasons, according to the Los Angeles Times.
Local businesses feel the pinch
Jordan, who works at El Portal Market, told SFGATE that "Business is a lot slower," adding that some guests coming down from nearby lodgings later in the day might soften the blow, but the immediate drop-off was obvious. Small hospitality and retail spots along the Merced River corridor depend on steady spring traffic, and repeated shutdowns on SR-140 put serious strain on already fragile revenues.
How to plan if you're heading to Yosemite
Park officials and Caltrans are urging travelers to check the park's current conditions page and Caltrans' QuickMap before hitting the road. Both tools list the latest closures and restrictions and are updated frequently, according to Caltrans QuickMap. If SR-140 is closed, visitors should use alternate entrances such as Highway 41 (South Entrance) or Highway 120 (Big Oak Flat) and plan for extra drive time while crews continue to assess and stabilize the slope.
