Authorities said the ranger had been knock in the head at the door of the ranger station. The suspect had allegedly asked to use the phone and as the ranger opened the door, he was struck by the man with an unknown object, rendering him unconscious.
When U.S. Forest Service agents and deputies arrived, the ranger was reportedly going in and out of consciousness. He was airlifted to County-USC Medical Center, where he is in stable condition.
The suspect, described as a male Hispanic in his 20s, fled in a green Mitsubishi Eclipse.
Authorities said there was no motive for the attack. There was no apparent sign of a burglary or robbery at the station.