This is the important northern entrance into the river cut gully or gap between highlands, and was an important barge loading transshipment point on the newly extended upper Lehigh Canal fed initially by a shortline railroad from the Mountain Top yard dating from the 1837 enabling legislation set up to join the Lehigh and Susquehanna Valleys via Mountain Top and the Ashley Planes incline railway.
This is the crucial northern gateway into the river-cut ravine between highlands, serving as a significant barge loading transshipment point on the newly extended upper Lehigh Canal. The canal was initially supplied by a shortline railroad from the Mountain Top yard established in 1837 to connect the Lehigh and Susquehanna Valleys via Mountain Top and the Ashley Planes incline railway.