A fast-moving, muddy waterfall cascaded down a cliffside in Utah's Zion National Park, this dramatic video shows.
Vehicles drove past as heavy rainfall triggered flooding in the park. Authorities issued a flash flood warning.
On Saturday (29 August), a flash flood killed two people in Grand Canyon National Park in the neighbouring state of Arizona.
Officials stated on Monday that at least 80 people had been rescued from Grand Canyon National Park and one person was unaccounted for.
