Monocacy Aqueduct

Benjamin Wright, the project's chief engineer, drew the plans with 6 piers, 2 abutments and 7 arches, each with a span of 54 feet.

Much of the building material was large quartzite stone blocks quarried at the base of nearby Sugarloaf Mountain.

However, the soldiers were unable to drill enough holes into the hard stone to place enough explosives to breach the structure.

Following damage caused to several canal structures caused by Hurricane Agnes and other flooding incidents in the early 1970s, the National Park Service and the Federal Highway Administration designed a steel banding system to stabilize the structure and installed a steel rod reinforcing system.

The C&O Canal National Historical Park and its partners restored the aqueduct to its original appearance in 2004-2005.