Deputies arrested Jesus Mora Nava, 30, in the area later that night and booked him into jail on suspicion of several child molestation charges. His bail was set at $235,000.
Sheriff's investigators say Nava approached the boy near Meadowbrook Middle School Monday afternoon and led him to a nearby hillside, where it appeared Nava had been camping out.
They said Nava gave the boy alcohol before sexually assaulting him.
Sheriff's deputies were alerted at 3 p.m. shortly after the attack and interviewed the boy at the school and later at a hospital.
Deputies searched for the man, but found the camp empty.
Later that night, a sheriff's helicopter used a infrared camera to detect a heat source in the area.
Nava was arrested after a short chase. Investigators say he was identified based on the victim's statement and help from local businesses.