The popular arch in the Glen Canyon National Recreation Area fell Thursday, and park rangers suspect changing water levels and erosion from waves in Lake Powell contributed to its demise.
Michelle Kerns, superintendent of the recreation area that spans the border of Utah and Arizona, said the collapse serves as a reminder to protect the mineral resources that surround the lake.
“These features have a life span that can be influenced or damaged by manmade interventions,” she said in a statement.
The arch was formed from 190 million-year-old Navajo sandstone originating in the late Triassic to early Jurassic periods. The fine-grained sandstone has endured erosion from weather, wind and rain, the statement said.
The recreation area encompasses nearly 2,000 square miles and is popular among boaters and hikers.
