The search, which was called off at about 3 p.m. ET Sunday, was expected to resume Monday, police said.
Two young men, 21 and 26 years old, were last seen walking far out into the rapids at about 11:30 p.m. ET on Saturday night.
A passerby tried to save the men, who couldn't swim, but the current was too strong and fast. They are presumed drowned.
Police said alcohol appears to be a factor.
The two young people had been out with friends Saturday night.
Their names are not being released at the request of their families.