Rockingham County Emergency Services Director Rodney Cates said in a news conference that the search for the two people still missing will continue Friday in an investigation stretching from Rockingham County to the Virginia border.
While the group set out on the river on Wednesday, authorities were not alerted to the situation until Thursday.
Three people are dead and two people, including a seven-year-old, are still missing after going "tubing" on a river.
All of the nine tubers were related and had been visiting other family members in the Eden area, authorities from the Rockingham County Sheriff's Office told the station.
While it is not unusual for people to float the Dan River on tubes, most people choose to get out of their inflatable rafts and walk around the dam, Cates said, adding that visitors are discouraged from tubing near the dam. Officials said their bodies were found about three miles from the dam.
The two missing people were identified as Teresa Villino, 30, and Isiah Crawford, 7, Bridish Crawford's son.
The identities of the three people who died have not been publicly released.
The four rescued tubers were identified as Reuben Villano, 35 (a brother of the missing woman); Eric Villano, 14; and Irene Villano, 18, all of Eden, and Karlos Villano, 14, of La Porte, according to the station.
"So far they have not been located".
Cates said that a Duke Energy employee saw the tubers and called 911 on Thursday afternoon.
He said they managed to stay afloat for approximately 19 hours, describing them as "very, very fatigued" when they were found. He also praised emergency personnel for finding the dead tubers and trying to find the two who remained missing.
Cates said that the rescued tubers spent the night floating in the water near the dam before they were found clinging to the tubes. The four were taken to a hospital and were expected to survive.