One boater is still missing.
The body of a California woman who went missing after two recreational boats crashed head-on at the Colorado River on Saturday has been recovered.
Mohave County Sheriff's Office search and rescue boats look for four people missing on the Colorado River, north of Lake Havasu in Arizona, on September 2, 2018.
Mortensen says Lewis was a California resident, but her hometown hasn't been determined.
Police and rescue teams discovered the remains of Christi Lewis on Monday, according to a report by CBS News.
Nine victims, including two in critical condition, were transported to nearby hospitals by ambulance.
Sheriff Doug Schuster of the Mohave County Sheriff's Office said that none of the 16 boaters involved in the crash were wearing life vests, which are not required by law.
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Some of the passengers were carried miles down the river before they were found, while others were pulled from the water by passing boaters, the sheriff's office said. Rescuers had to call off the search until Sunday morning because it was too risky to put divers in the river after dark.
Map locates where boats collided on Colorado River.
The crash occurred on the border of California and Arizona, north of Lake Havasu, between Pirates Cove and Topock Marina, according to the Las Angeles Times.
The search for two people "presumed submerged" was halted overnight, the San Bernardino County Fire District said in a statement.
The search resumed Sunday, but authorities said the toll of missing had risen to four at that point. Some passengers in the boats were thrown into the water upon collision while others jumped.
The search operation has shut down a two-mile area of the river, Schuster said. Divers were sent into the river's waters, which can range from shallow to 30 feet deep. The Mohave County Sheriff's Office also stated that divers were in the area to conduct a search and warned boaters in the area to do so with caution.