Monsoon Season Brings Sudden Flood Risk To Zion’s Narrow Canyons

Visitors planning a trip to Zion National Park over the next several weeks are being reminded to keep a close eye on the weather as southern Utah enters the annual monsoon season, a period that can bring dangerous flash flooding with little warning.

According to a National Park Service press release, monsoon conditions typically develop from July through September as moisture moving into the Southwest creates unstable weather capable of producing sudden, intense afternoon thunderstorms. Although mornings may begin with clear skies, storms can develop quickly and create hazardous conditions throughout the park.

Melissa Sue Gerrits, Getty Images

Flash flooding is one of Zion's most serious natural hazards. Heavy rain falling many miles away can rapidly funnel through narrow canyons and slickrock drainages, sending fast-moving water downstream into popular destinations such as The Narrows. Because storms may occur 15 to 20 miles upstream, visitors can encounter dangerous floodwaters even when the skies overhead remain sunny. The watershed that feeds The Narrows covers approximately 288 square miles, allowing distant rainfall to quickly affect canyon conditions.

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Floodwaters may carry rocks, tree limbs and other debris, while temporary waterfalls cascading from cliffs during storms can also contain hazardous material. Park officials encourage visitors to admire these dramatic displays only from a safe distance.

Numerous Resources Available On Line

"For the health and safety of all visitors, Zion National Park provides numerous online tools and visitor center resources that can help visitors plan for a safe trip through the park," Superintendent Jeff Bradybaugh said in the press release. He added that ranger talks, Zion Lodge evening programs, Junior Ranger activities and other free programs offer enjoyable alternatives when weather makes hiking unsafe.

A river running through a narrow canyon filled with rocks

The National Park Service urges visitors to check weather forecasts, flash flood potential and current park conditions before entering any canyon, including The Narrows. Visitors should also monitor conditions throughout the day, pay attention to posted advisories and closures, avoid crossing flooded areas and remain aware that weather upstream can quickly change conditions where they are recreating.

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Officials also encourage travelers to remain flexible and have alternate plans. When storms interrupt hiking, visitors can still enjoy a variety of educational programs and other activities throughout the park while waiting for conditions to improve.