9/09/2007 After the partial collapse of the Catoctin Aqueduct in 1973, the east arch and abutment and portions of the west arch and abutment remained in place. Wing walls and arch piers also remained in place. Several preservation campaigns have taken place to stabilize the existing portions of the structure. The National Park Service installed a Bailey bridge adjacent to the aqueduct. This bridge allowed towpath continuity for park visitors.