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Flash flooding over the weekend at the Grand Canyon led to the deaths of two people and left one missing. Dr. John Giusti, 46, and Brent Rosenkranz, 42, were identified as victims; their third friend is still unaccounted for. An early warning system installed after last year's wildfire failed when it went offline during the flooding event. Officials noted this was likely due to debris flow but confirmed the exact cause remains unknown. The incident highlights concerns over the effectiveness of such systems in preventing fatalities and raising questions about timely alerts for visitors and residents.
Written locally by qwen2.5:14b on 2026-09-17,
using this article's own text rather than the other coverage of the
same event (that is the story summary below).
Story summary
On Saturday, flash flooding in Bright Angel Creek within the Grand Canyon claimed at least two lives: Dr. John Giusti, 46, from Granbury, Texas, and Brent Rosenkranz, 42; both were part of a group of three friends hiking through the area. A third friend, whose name is not specified but is described as 53 years old, remains missing. The flooding occurred after a wildfire last year made the mountainside water repellent, increasing flood risks. An alert system designed to warn officials when water levels rise dangerously was installed following that fire; however, it reportedly went offline during the event, raising questions about its effectiveness in warning hikers and rescuers. Search efforts for the missing friend are ongoing as of Tuesday.
Written for “Grand Canyon Hiking Deaths” on 2026-09-18,
grounded in this article and the 1 other(s) covering the same event.
A search and rescue operation is expected to continue Tuesday to find the last person missing in flash flooding that hit parts of the Grand Canyon over the weekend — as questions arise about whether people could have been warned sooner.
uncertain
people → expect → weekend
One was identified by his family as Dr. John Giusti, a 46-year-old chiropractor from Granbury, Texas.
asserted
One → identify → Granbury
His friend, Brent Rosenkranz, 42, was also killed, according to a family spokesperson.
uncertain
friend → kill → spokesperson
A third friend, , 53, was still missing as of Monday night, his family said.
asserted
family → miss → night
Officials said at a press conference Monday night that an alert system had been installed in Bright Angel Creek, where the weekend's catastrophic flash flooding occurred.
asserted
flooding → say → Creek
The system was installed in the aftermath of a wildfire last year that left the area particularly susceptible to this type of disaster by making the mountainsides essentially water repellent.
asserted
mountainsides → instal → disaster
The system is made up of a series of river gauges, designed to send out an alert when water levels in the creek reach a certain point.
asserted
levels → make → point
Brian Drapeaux, acting superintendent of Grand Canyon National Park, said the system did alert officials to rising levels in the creek on Saturday.
asserted
system → act → Saturday
But it proceeded to "go offline" as the situation "progressed down the creek and picked up speed and destructive force," he added.
asserted
he → proceed → speed
Drapeaux said whether the alert gauges were knocked out by floodwaters or something else was still unclear.
uncertain
knocked → say → floodwaters
"They were working and then they weren't working," he said.
asserted
he → work → ?
"We're not sure why – whether it was the debris flow that knocked them out of service or whether it was some other factor that put them offline."
asserted
that → knock → them
Officials say this was the most devastating flash flood in the park in recent memory.
asserted
this → say → memory
CBS News asked if anyone saw a flash flood of this magnitude coming, given that the area saw over 5 inches of rain in 48 hours.
asserted
area → ask → hours
"I will follow up with you on your question," said Elizabeth Peace, a spokesperson for the Department of Interior.
asserted
Peace → follow → Interior
"We don't have the weather service with us.
asserted
We → have → us
"
CBS News had not received an answer as of Tuesday morning.
asserted
News → receive → morning
Eighty-two people were evacuated from the canyon, some by helicopter, as waters began to rise.
asserted
waters → evacuate → helicopter
For many, like Steve Kramer, it was the pounding rain and crumbling canyon sides that alerted them.
asserted
that → pound → them
"Ground around us started flooding up and filling with water coming off of the canyon," said Kramer.
asserted
Kramer → flood → canyon
The flash floods also severely damaged the major water pipeline in the park, which means there is only about two weeks of water left as the area enters peak wildfire season, according to officials.
uncertain
area → damage → officials
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