Which waterway, Chain of Rocks Lock or Dismal Swamp Canal, is the oldest continually operating man-made canal in the United States?
Chain of Rocks Lock Chain of Rocks Lock, also known as Locks No. 27, is a lock situated at the southern end of Chouteau Island near St. Louis, Missouri on the Upper Mississippi River. Its associated dam is just downstream of the Chain of Rocks Bridge, and the lock is located over 3 mi southeast on the Chain of Rocks canal. The canal and locks allow river traffic to bypass a portion of the river that is unnavigable in low water due to an anticlinal exposure of bedrock in the river—a "chain of rocks".
North Walsham &amp; Dilham Canal The North Walsham and Dilham Canal is a waterway in the English county of Norfolk. It was authorised by Parliament in 1812, but work on the construction of a canal which ran parallel to a branch of the River Ant did not start until 1825. It included six locks, which were sized to accommodate wherries, and was officially opened in August 1826. It was 8.7 mi long and ran from two bone mills at Antingham to a junction with the River Ant at Smallburgh. It carried offal for the bone mills and agricultural products, as it proved cheaper to land coal on the beach at Mundesley and cart it overland than to use the canal.