The 15-year-old was hiking back from the mountain's first peak with classmates just before noon Thursday when she lost her footing. She tumbled just a short distance onto a boulder, but took the full impact on her head, knocking herself unconscious, according to rescuers.
When paramedics and volunteers arrived on scene, the victim was still semi-conscious and showing signs of severe concussion.
A North Shore Rescue flight team airlifted the teen to a waiting air ambulance, which took her on to hospital.
No update on the victim's condition has been released.
