It happened sometime between 8:30 p.m. and 10:30 p.m. not far from DePaul College Prep.
According to Chicago police, the teen was under the influence of an unknown substance after drinking a cup of water. She was then led into the area by an unknown male offender, who sexually assaulted her, police said.
The girl was found and taken to Illinois Masonic Hospital in fair condition, police said.
No one is in custody.