This map shows why the aqueduct was often called the "crooked" aqueduct. This was due to the relationship of the aqueduct to the canal prism. Rather than a straight approach at each end of the aqueduct, the canal prism had severe turns as it approached the aqueduct. Topography and the stream channel orientation accounted for this engineering element. Due to the bends in the canal prism, canal boat captains were obligated to bring their boats to a stop, manually align the boat before proceeding through the aqueduct.