Park rangers said witnesses told them Aleh Kalman of Sacramento was swimming back from a rock in the middle of the Merced River about 150 feet upstream of the waterfall Saturday when the current got the best of him, the San Francisco Chronicle reported.
Park officials said Kalman was at the park with a church group and and had been hiking the Mist Trail before the accident occurred, the newspaper said.
Efforts to find him Saturday and Sunday were fruitless, CNN reported.
"We believe it's impossible to survive a fall like that," park spokeswoman Kari Cobb said.
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