The lower canal began below Packers Dam. A wing wall projected into the upper pool to create slack water next to the loading docks, at the same level as the top of the first guard dam. That dam (known as Dam 1) was downstream of Broadway, opposite Flagstaff Hill and the cross-canal Bear Mountain for which Mauch Chunk was named. The 44 lift locks begin with Lock 1 at the dam. This was a weighing lock, using a platform which lifted a barge and weighed the boat and its load. Each non-LC&NC barge on the canal was recorded. Empty weights were subtracted, and tolls were assessed by the ton per mile traveled. Most of the 44 locks on the descent to Easton, PA were spillway variants of White's bear-trap lock. When tipped or triggered, they released several acre-feet (creating a wave to raise the water level as the canal boat sank downriver). The canal carried central Lehigh Valley anthracite to northeastern urban markets, particularly Philadelphia, Trenton and Wilmington, and supporting new industry in Bristol, Allentown and Bethlehem, Pennsylvania with the Morris and Delaware and Raritan Canals and a number of railroads. The privately funded canal became part of the Pennsylvania Canal system, a complex of canals, towpaths and (eventually) railroads. It was last used for cargo in 1942, and the LC&N Company was sold to Pennsylvania for preservation and recreational use in 1964. Portions of the canal and the later rail lines flanking it are part of the Delaware and Lehigh National Heritage Corridor, a multi-use rail trail.