In the fifteenth century traffic peaked, with more than 3,000 shipments of more than 30,000 tons of salt moving on the canal each year. This number declined by the seventeenth century to 400 to 600 shipments (5,000 to 7,000 tons). In 1789 there were still sixty-four shipments carrying approximately 680 tons of salt. Plans for a new Baltic–North Sea canal were proposed as early as the seventeenth century, but none was implemented until the end of the nineteenth century, when the new Elbe–Lübeck Canal was built using parts of the old route of the Stecknitz Canal. For five hundred years the canal was used to transport the "white gold" and other goods; today the "Palmschleuse" lock in Lauenburg is one of the last remaining parts of the former canal, preserved as an historical monument.