Duncan McGrath- Seneca Aquaduct
Seneca Aqueduct, the first of eleven aqueducts erected along the C&O Canal, was constructed between 1828-32 at a cost of $24,340.25. The face of the aqueduct is cut Seneca red sandstone. It is 113 ft. long between abutments and has three segmental arches, each with 33 feet span and a 7½-foot rise.
The west arch fell September 1971, being carried out by water backed-up in a flood of Seneca Creek. The berm parapet and coping remained intact over west arch but were removed when temporary repairs were made.
During the operating years of the canal, Seneca was the first important transshipment point above Georgetown. At times it boasted stores and a granary on its large basin, and there were the quarries for the much-desired red Seneca sandstone just above the aqueduct.