The popular “Double Arch” geologic feature in Glen Canyon National Recreation Area collapsed late last week, according to a park release. The formation has also been called “Toilet Bowl,” “Crescent Pool,” and “Hole in the Roof,” due to its unique shape.
Double Arch was formed millions of years ago from 190-million-year-old Navajo sandstone, which consists of thick layers of cross-bedded sandstone formed by windblown sand dunes in a vast ancient desert.
Since the creation of Lake Powell, formed after the Glen Canyon Dam caused water levels in the lake to rise, visitors have enjoyed visiting Double Arch, and would often cliff jump through the hole.
The same erosion from weather, wind and rain that helped form the feature has now resulted in its collapse. The release stated, “Changing water levels and erosion from wave action is suspected of contributing to the ultimate collapse of the arch.”
“This event serves as a reminder of our responsibility and need to protect the mineral resources surrounding Lake Powell,” said Michelle Kerns, superintendent of the Glen Canyon area.
She continued, “These features have a life span that can be influenced or damaged by manmade interventions. While we don’t know what caused this collapse, we will continue to maintain our resource protection efforts on Lake Powell for future generations to enjoy. Please enjoy our resources but leave no trace.”
No injuries were reported from the collapse.
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