On an otherwise quiet Sunday morning, the sounds of shovels and pickaxes were carried on the wind through Phipps Park, where a group of volunteer cyclists worked—not to ride, but to restore.

According to Zion National Park spokeswoman Amanda Rowland, the slide occurred about 3:30 p.m. Monday in the Big Bend area. Rocks, dust and other debris fell near the Weeping Rock bus stop ...