Noah Abbott had been sought by members of the San Bernardino County Sheriff's Department Dive Team, who again scoured the frigid water for hours on Saturday amid strong currents and zero visibility.
"Our hearts are broken that we couldn't bring closure to the family," the team's commander, Lt. Doug Wolfe said on Twitter. "We are truly sorry for their loss."
Hesperia dive op ends. Our hearts are broken that we couldn't bring closure to the family. We are truly sorry for their loss-SBSD Dive Team pic.twitter.com/6tv8z2Mdl7— Doug Wolfe (@SBCSDdwolfe) March 5, 2017
Noah's mother, 31-year-old Christina Eileen Estrada, was pronounced dead at the scene after the collision about 6:45 p.m. Thursday. Her 3-year-old son Jeremiah Robert Abbott was rushed to a hospital, where he died. Elijah Estrada, brother of Jeremiah and Noah, was rescued after he was found clinging to a float. He was later released from the hospital.
The cause of the crash remains under investigation.
The Associated Press contributed to this report.