Rangers say Aleh Kalman, 19, was swimming in the Merced River Saturday when swift currents pulled him over the 594-foot Nevada Fall.
A helicopter searched the area for the 19-year-old Saturday and Sunday as rangers and a search team searched on foot.
Park officials say Kalman was visiting with a church group.
The trail below the falls has been closed while the search continues.
The Associated Press contributed to this report.
