The 23-year-old man from Aurora went into a restricted area of Sandstone Point Overlook around 2:30 p.m. when officials say he fell between 20 and 30 feet.
He suffered injuries to his head, shoulder, hip and leg.
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Officials said he was taken by boat to a nearby field by the Utica Fire Department, where he was then flown to a local hospital in Peoria. He was said to be conscious when he was airlifted, officials added.
The man has been cited for entering a restricted area.