A canal linking Philadelphia with the Susquehanna River across southern Pennsylvania had been in the making for quite some time. This eventually gave birth to the Union Canal, which was built between Middletown, located along the Susquehanna River near Harrisburg, with Reading on the Schuylkill River, which winds its way to Philadelphia. During the canal's construction, several land features had to be dealt with, and in the case of Lebanon, Pennsylvania, it was more practical to build a tunnel through a hill than to build a series of locks. This gave birth to the Union Canal Tunnel. The Union Canal Tunnel was a critical link connecting the eastern and western branches of the 82-mile Union Canal, which was built through the ridge dividing the Quittapahilla Creek and Clark's Run just northwest of the center city of Lebanon, Pennsylvania. It is the oldest existing tunnel in the United States, dug through 729 feet of slate rock which contained veins of limestone. Drilling for ...
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