Jeff Henderson celebrates winning the gold medal in the men's long jump (AP Photo/Martin Meissner)

RIO DE JANEIRO (AP) -- Jeff Henderson will leave Rio with a gold medal. 

He missed making it a historical gold medal by just over 30 minutes. 

Henderson won the men's long jump Saturday night to win what the U.S. Olympic Committee considers the nation's 999th gold medal in Summer Olympics history.

Not long after, U.S. women's 4x100-meter medley relay team of Kathleen Baker, Lilly King, Dana Vollmer and Manuel swam to gold medal No. 1,000. 

Henderson had no idea the signifgance of his medal until long after his leap of 8.38 meters (27 feet, 6 inches) on his final jump gave him the gold. 

"To have that, 999, it feels like I'm in a dream, honestly," he said, adding that winning the gold feels like "having a newborn baby." 

Where he felt in the U.S. overall medal count mattered very little to Henderson, who dedicated his gold to his mother, who he said suffers from Alzheimer's Disease, is bedridden and no longer recognizes him. 

"My mom has Alzheimer's, and she's still living and fighting," he said. "She's bedridden. So for me to come here and win the gold medal, this is for her."