This is one of the water intakes for mills in Georgetown. This one is at 0.81 miles on the 4 mile level of Georgetown, just before Key Bridge. The C & O sold water to some of the mills in Georgetown, and this is one of them. The NPS site says: These ruins are related to a still extant mill. A trench, perpendicular to the canal, diverted canal water the Wilkens Rogers flour mill where it powered a water wheel. The concrete-faced intake remains.