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ExplainerEnvironmentArizona3 min read

What is known about the Grand Canyon flash flood and the search for unaccounted visitors

A flash flood in Grand Canyon National Park left one dead and up to 15 unaccounted for on Aug. 29, the National Park Service said.

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GRAND CANYON, Ariz., Aug. 31 (Our Arizona Times) — A flash flood that struck Bright Angel Canyon and the Phantom Ranch area of Grand Canyon National Park in Arizona has left about 14 to 15 people unaccounted for, according to updates from the National Park Service. The estimate changed from an earlier report of more than 20 as officials worked to identify and contact visitors in the area.

The flood hit at about 2:30 p.m. Aug. 29, 2026, according to the park service. One 46-year-old man was found dead near Crystal Rapids along the Colorado River. His identity had not been released in the information provided by the park service.

The search and evacuation effort involves areas along Bright Angel Creek, Bright Angel Campground, Phantom Ranch and the North Kaibab Trail.

Who is being sought?

The National Park Service is asking for information about people who may have been hiking or backpacking along the Bright Angel Creek corridor, staying at Bright Angel Campground or Phantom Ranch, or traveling on the North Kaibab Trail between the North Kaibab Trailhead and Phantom Ranch.

Park spokesperson Joelle Baird said the people being sought were either on backcountry trips in the inner canyon or believed to be day hiking near the North Kaibab Trail and Phantom Ranch.

The NPS Investigative Services Branch asked anyone with information to call 888-653-0009 or email nps_isb@nps.gov. Helpful details include a person’s name, approximate location, travel plans, group size, clothing or backpack description and when the person was last known to be in the area.

The park service has described the people as unaccounted for. The information available does not establish how many are confirmed missing, how many may have been found later or whether the final count will change again.

What happened during the response?

By the morning of Aug. 30, the NPS said 62 people had been evacuated from Phantom Ranch and the lower North Kaibab Trail. The Arizona Department of Public Safety assisted with the evacuations, and more were planned from Cottonwood Campground and Phantom Ranch.

The flood caused major damage along Bright Angel Creek. The NPS said nearly all footbridges across the creek were destroyed, cutting off hiker access between parts of the corridor. The agency also reported significant damage to other park infrastructure.

The park closed Phantom Ranch, Bright Angel Campground, the Phantom Ranch Canteen and cabins, the North Kaibab Trail between its trailhead and Phantom Ranch, and the Black and Silver bridges. The closures were in effect until further notice, with no reopening date provided.

The Coconino County Medical Examiner’s Office responded after the recovery of the dead man, according to information released about the incident.

Why are water supplies also affected?

The flood damaged the park’s water pipeline. As a result, the park service began major water-conservation measures and planned restrictions affecting overnight accommodations. Stage 4 water restrictions on the South Rim were scheduled to begin at noon Aug. 31, according to information attributed to the NPS.

The American Red Cross assisted evacuees at the Maswik Lodge Cafeteria.

The pipeline’s full condition, the total cost of infrastructure damage and the length of the water restrictions were not available in the information provided.

Could more flooding occur?

The National Weather Service warned that additional thunderstorms and heavy rain could cause more flash flooding. Its forecast language, as reported by the park service and news organizations, said excessive rainfall could continue to create flash-flood risks.

Flash floods can develop quickly in narrow canyon systems. Heavy rain falling upstream can send a rapid surge of water, mud, rock and debris through a drainage even when conditions nearby appear calmer.

This incident shows the immediate risk posed by intense rain to hikers, trails, bridges and park utilities. The available information does not include a full rainfall dataset, flood-gauge record or scientific assessment linking this single event to a long-term climate trend. One flood, by itself, cannot establish such a trend.

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Tami McMillan

Tami McMillan is a national environment reporter for Times Media Service, based in the Washington bureau. McMillan covers environmental policy, climate, conservation, pollution and natural resources, and the federal agencies and regulations that shape them. McMillan holds a master's degree in environment and development and grew up in Edinburgh, Scotland.

Write to Tami