Abandoned Water intake for mill (Mill long gone) at 0.61 miles on the 4 mile level (Georgetown) on the Chesapeake and Ohio Canal. NPS site says: Located 81' above 31st Street Bridge, the intake measures 8' high x 7' wide. Now blocked off by a stone wall 30 inches back from canal face and topped off with a thin concrete slab. It is not known when this was done.