TL;DR: One person died and about 15 were missing or unaccounted for after a Saturday flash flood in Bright Angel Creek forced helicopter evacuations and shut down water and overnight stays in Grand Canyon National Park.

One person died and about 15 people were missing or unaccounted for after a major flash flood at the Grand Canyon, the National Park Service said Sunday, according to the Associated Press as carried by WBRZ.

The flooding Saturday in Bright Angel Creek, which flows into the Colorado River, forced evacuations, pushed large boulders into the Colorado River and knocked out the sole water pipeline that serves tourists and residents.

The body of a 46-year-old man was recovered Sunday evening near Crystal Rapids along the Colorado River, the park service said without providing additional details. Officials from an Arizona coroner's office were on scene.

More than 60 people were airlifted from the depths of the canyon. The park service asked anyone with details about hikers or campers still unaccounted for to get in touch. The Arizona Department of Public Safety was helping with additional evacuations Sunday.

Limited potable water supply because of the damaged pipeline means tourists won't be able to stay overnight at lodges and hotels within the park, starting Monday. Year-round residents are being asked to conserve water.

What happened in Bright Angel Canyon

Saturday flood in a narrow corridor

The flooding struck Saturday in Bright Angel Creek, according to the Associated Press as carried by WBRZ. A separate account documented by EcoPortal placed flash flooding down Bright Angel Canyon at approximately 2:30 p.m. on August 29.

Parth Desai was hiking through a narrow passage in Bright Angel Canyon with fellow physicians and a park ranger when heavy rain started falling Saturday.

"We saw the creek flood, waterfalls coming up out of nowhere, boulders, mud, landslides happening everywhere," he said.

Later, as they made their way toward Phantom Ranch, a colleague shouted "Up, Up, Up, Up!" as a 4-foot (1-meter) debris wall headed toward them and they ran up into a patch of cacti, he said. They were rescued by helicopter late Saturday after making it to the Phantom Ranch area, he said.

Erica Viola said she and about 50 other hikers at Bright Angel Campground watched the creek rise Saturday and debris start to flow by, including what looked like a bunkhouse. The helicopter ride out cut her adventure short by two days, she said.

How fast the creek changed

Torrents of water wiped out footbridges over the creek and altered the landscape, widening the creek bed and extending an existing river rapid or creating a new one.

EcoPortal reported that nearly all foot bridges crossing over Bright Angel Creek were destroyed. The entire trail system relies on these crossings.

Both Phantom Ranch and Bright Angel Campground were affected, according to EcoPortal. The Black Bridge and Silver Bridge across the Colorado River were both closed.

Flood debris and metal structures created problems on the river, which led to the closure of river traffic through that area, according to EcoPortal.

Search, rescue and closures

More than 60 airlifted

The Saturday flooding led to more than 60 people being airlifted from the depths of the canyon, according to the Associated Press as carried by WBRZ.

EcoPortal reported that by the next morning, August 30, 62 individuals had been removed from Phantom Ranch and the lower portions of the North Kaibab Trail. Additional removals were conducted from Phantom Ranch and Cottonwood Campground.

The Arizona Department of Public Safety was helping with additional evacuations Sunday. The park service asked anyone with details about hikers or campers still unaccounted for to get in touch.

Corridor sites closed Sunday

Popular tourist spots, including the Bright Angel Campground, the North Kaibab Trail and Phantom Ranch, home to a historic canteen and dormitories, remained closed Sunday.

EcoPortal reported that the National Park Service reported that the North Kaibab Trail remained closed, while portions of the South Kaibab, Bright Angel, Tonto and Plateau Point trails remained accessible.

On September 1st, park personnel assessed damage to parks utilities, buildings, bridges, and paths along the length of Bright Angel Canyon, according to EcoPortal.

Lodging is still available just outside the park's South Rim entrance station in Tusayan.

For backcountry travelers, the immediate lesson documented in this event is to treat a closed trail and a closed river crossing as a hard stop. Do not enter a closed corridor to check conditions. Wait for the posted reopening and for instructions from rangers managing evacuations.

Water system failure and overnight rules

Sole pipeline knocked out

The flood knocked out the sole water pipeline that serves tourists and residents, according to the Associated Press as carried by WBRZ.

The pipeline serves 6 million visitors a year and roughly 1,600 residents of Grand Canyon Village.

"These measures are crucial for ensuring the safety and sustainability of water resources," the park said in a statement about conservation and overnight limits.

Halting overnight stays at the park because of a lack of water is rare, although the pipeline frequently has failed over the years. While the Grand Canyon has large storage tanks for potable water on the South Rim, they won't be refilled while the pipeline is out of service.

$208 million project interrupted

A $208 million rehabilitation of the pipeline and upgrades to the associated water delivery system started in 2023, with the park service calling it a crucial investment to ensure the park can meet the needs of residents and visitors. The project was expected to be completed next year.

"Heaven help us if the whole thing down there at the bottom has to be reconstructed," said Jack Schmidt, director of the Center for Colorado River Studies at Utah State University. "Where are they going to get the money?"

For wilderness readiness, the water outcome matters as much as the flood itself. Tourists won't be able to stay overnight at lodges and hotels within the park, starting Monday. Year-round residents are being asked to conserve water.

Carry your own drinking water into the canyon and plan to carry water out if systems are disrupted. Conserve stored water, use designated sanitation facilities when provided, and follow posted conservation requests from the park.

Why monsoon rain turned deadly

Soaked ground, then a cloudburst

About half an inch to 1 inch (1 to 2.5 cm) of rain fell within about 20 minutes on a rocky slope where there's a steep drop in elevation, said National Weather Service meteorologist Darren McCollum in Flagstaff. The deluge was preceded by two smaller systems that drenched the area hours earlier.

"So when the main storm moved in, torrential rain fell on everything that was already soaked, and that caused all the problems that we're seeing," McCollum said.

Visiting the Grand Canyon — a crown jewel of the national park system — can be particularly dangerous in the summer because of the risk of flash flooding that accompanies the monsoon, or rainy season. Clear days can give way quickly to thunderstorms and downpours.

What the canyon does to runoff

EcoPortal explained that there isn't much room for water to spread when you are in a canyon. Runoff is funneled into the same tight space as the creek.

Bright Angel Canyon increases that effect by narrowing the space available and forcing runoff into a single tight path containing trails, bridges, and park buildings, according to EcoPortal.

The practical signal from Saturday was the creek itself. Desai described waterfalls appearing suddenly with boulders, mud and landslides. Viola described the creek rising at the campground with debris moving past.

When water rises and debris appears, move up and away from the channel. Do not try to cross a flooded creek. Climb to high ground, stay clear of slide paths, and wait for rescue or for water to recede and for officials to direct movement.

Readiness takeaways for slot canyons

Check the forecast for the watershed above your route, not only the sky overhead. McCollum's account shows two earlier systems soaked the area before the main 20-minute downpour.

Do not camp or wait in a creek bed during monsoon season. Viola's group watched the rise from Bright Angel Campground before evacuation by helicopter.

Treat waterfalls forming on canyon walls, muddy water, boulders and mud as a warning to gain elevation immediately. Desai's group ran uphill into cacti when a 4-foot debris wall approached.

Stay together where possible and follow ranger direction. Desai was with fellow physicians and a park ranger and reached the Phantom Ranch area before helicopter rescue late Saturday.

Leave an itinerary with a contact outside the canyon. The park service asked anyone with details about hikers or campers still unaccounted for to get in touch after about 15 were listed as missing or unaccounted for.

Sources referenced