The valleys of the Juniata River occupy the very heart of the state of Pennsylvania. This ecosystem is a substantial contributor to the great Chesapeake watershed that drains a major portion of the continent. Ancient Native American pathways along the Juniata gave way to an early turnpike and soon welcomed a canal. With much fanfare, the Pennsylvania Railroad chose the Juniata Valley as the choice route to unify the state. The land that provided iron,...