Peter Flores was last seen at 9 p.m. Thursday. Flores' son and a friend stayed in the boat after it capsized, but Flores tried to swim for the shore, according to the Placer County Sheriff's Department.
It is not clear whether Flores was wearing a flotation device.
Dive team members searched the frigid waters for Flores on Friday while other search and rescue teams searched the rugged shoreline. It was unknown whether the search for Flores had resumed today.
The man's family was camping at Hell Hole, a reservoir operated by the Placer County Water Agency, located about 65 miles east of Auburn, Placer County Sheriff's Department Dena Erwin said.