Two people were critically injured in the crash, the sheriff's office said, including one person who was airlifted from the scene with a head injury.
A recreational boat carrying 10 people and another vessel with six people on board collided head-on Saturday night on a well-traveled stretch of the river that marks the border between California and Arizona, the Mohave County Sheriff's Office said in a statement.
"We are shocked and heartbroken to learn about the passing of one of our own in this weekend's tragic Colorado River boat crash", said Gary Herbst, Kaweah Delta's CEO.
The Mohave County Sheriff's Office in Kingman, Arizona, says the body of 24-year-old Kirra Drury of Ventura, California was found Tuesday afternoon. Ten people were injured, with one in critical condition, authorities said.
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He was transported to an area hospital by ground ambulance before being flown to Arrowhead Regional Medical Center, officials said.
Mohave County Sheriff Doug Schuster said authorities are treating the search as a recovery effort.
Dozens of divers from multiple agencies have assisted in the search which, over the past two days, has covered a roughly 5-mile-long stretch of the river, from Park Moabi Channel to Topock Gorge. None of the boaters were wearing life jackets, which aren't required but are recommended by authorities, Shuster said. Some passengers in the boats were thrown into the water upon collision while others jumped. Divers have been sent into the river, which can run as deep as 30 feet (9 meters).
Helicopters were deployed, and authorities scoured the shoreline to try to find them.
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Footage on local TV channels have shown a bus, a few cars and some motorcycles stuck in the caved in section of the bridge . A traffic police official told PTI that tram services have been suspended from CGR Road to DH Road and Judges Court Road.
The three others still missing, two other women and a man, are presumed dead. Rescuers had to call off the search for the missing until Sunday morning because it was too risky to put divers in the flowing water after dark.
The second boat was badly damaged, but remained afloat.
The sheriff's office said it would continue to patrol the river "until all the unaccounted for passengers are located".
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