Leeper area resident Cassandra Callihan escaped injury in a traffic crash, in northern Clarion County.     Callihan had been operating an auto on Route 66, in Farmington Township.     Her vehicle veered off of the highway at a curve and first hit a utlity pole.     Veering back across the highway, the auto then went into a yard and finally slammed into a wooden bridge.     Initially summoned to aid, at the location, were Farmington Townshp Fire-Rescue and Ambulance crews.     This wreck occurred just  before one Sunday morning.