What century were the Leiper Canal and Duluth Ship Canal built?
Leiper Canal Early in the 19th century, the Leiper Canal built in 1828-29 during the middle of the American canal age ran about 3 mi along Crum Creek in Delaware County to its mouth in Eastern Pennsylvania's Delaware Valley carrying its owners quarried products to docks on the Delaware River tidewater until 1852.
Danziger Bridge The Danziger Bridge is a vertical lift bridge named after a New Orleans lawyer and businessman, which carries seven vehicular lanes of U.S. Route 90 (Chef Menteur Highway) across the Industrial Canal in New Orleans, Louisiana. It was built to replace the old Danziger Bridge, a draw bridge constructed in 1931–1932. The current Danziger Bridge was constructed on the south side of the old bridge between 1983 and 1987, officially opening in February 1988, becoming the widest lift bridge in the world. Most marine traffic is accommodated in the down position.