(KAIR)--A 15-year-old Atchison boy requires helicopter transport for hospital treatment following a single vehicle, late Friday afternoon Atchison County crash. 

Sheriff Jack Laurie says Colby Dunbar was northbound on Pratt Road when he failed to negotiate a curve just past Fremont Street. 

That caused his Nissan Altima to cross the roadway and collide with a tree in a yard located at 8438 Pratt Road. 

Dunbar, suffering what Laurie describes as a broken leg, was flown to Children's Mercy Hospital, in Kansas City, for treatment. 

The wreck happened shortly before 5:00.