Flash Flooding and Rockfall Close Zion National Park Roads
Zion National Park in Utah experienced flash flooding on Monday night, August 31, 2026, following heavy thunderstorms earlier in the day. The National Park Service (NPS) reported flash flooding at 8:51 p.m. MDT, which caused water to cascade over cliffs, leaving mud, rocks, and debris on roadways. The Zion Mount Carmel Highway was closed to both east- and west-bound traffic due to rockfall. This event occurred during the region's monsoon season, which typically brings rapidly changing weather and intense afternoon thunderstorms. A flash flood warning issued by the National Weather Service in Salt Lake City was in effect until 11 p.m. MDT on Monday. The flooding comes just a day after deadly flash floods at the Grand Canyon, which resulted in two fatalities and one person still missing.