Visitors could enjoy a three-and-a-half-hour journey by rail up the Merced River Canyon from Merced to El Portal, just outside what is now Yosemite’s Arch Rock Entrance. Everything changed in ...

The slide came crashing down across both lanes of Highway 140, a scenic winding route along the Merced River between the town of Mariposa and Yosemite’s Arch Rock entrance. “The boulders that ...