Steep rock walls prohibited foot travel through the gap until a road was built on the Pennsylvania side of the river in 1793. In 1830 a road was built on the New Jersey side through the gap and north toward Pahaquarry. Interstate 80 passes through the gap on the New Jersey side as of the early 1970s via the Delaware Water Gap Toll Bridge. The Pennsylvania portion of the New Jersey Cut-Off mainline of the Delaware, Lackawanna and Western Railroad comes into Slateford, PA. The Pennsylvania Northeast Regional Rail Authority owns the trackage in the Water Gap area and is operated by the Delaware-Lackawanna Railroad. Pennsylvania Route 611, which is adjacent to the railroad for most of way through the gap, occupies the right-of-way of a former trolley line. Interstate 80 occupies the former right-of-way of the New York, Susquehanna and Western Railway.