The Cayuga–Seneca Canal is a canal in New York, United States. It is now part of the New York State Canal System. The Cayuga–Seneca Canal connects the Erie Canal to Cayuga Lake and Seneca Lake. It is approximately long. History The Seneca River, now the Cayuga–Seneca Canal, always has been an economic engine for the communities of Waterloo and Seneca Falls. The Seneca Lock Navigation Co., a private enterprise formed in 1813, dammed three sets of rapids and installed locks to allow goods to be transported to the Erie Canal. In 1818, a canal was opened between Cayuga and Seneca Lakes. By 1823, an average of eight boats a day were passing through the lock at Waterloo, carrying flour, potash, pork, whiskey, lumber and wool and returning with other products and merchandise. Job Smith, Seneca Falls’ first businessman, opened a portage company on the eastern end of the river in 1787. The company transported travelers, boats and goods around a mile-long series of rapids with a drop known as “the Falls.” The locks at Seneca Falls were completed in 1818. Improvements between the lakes, completed in 1821, made eight stone locks and nearly two miles of dug canal in addition to sections of the river. To further develop industry, the rapids were dammed to form the Upper, Middle and Lower Falls, and rapid industrialization began in 1825. Through Seneca Falls, there was a lock for every important mill site, raising or lowering the boats a total of . In 1825, a canal was begun to connect Seneca Lake with the newly constructed Erie Canal at Montezuma and the Cayuga–Seneca Canal was put into use in 1828. The Canal was enlarged in 1862, and the Flats, an area adjacent to and east of the village center, grew into a major industrial area, producing fire engines, hose carts and other firefighting equipment, pumps and other iron goods including stove parts, bootjacks, corn shellers, meat choppers, sausage stuffers, flatirons and bells. A knitting mill made socks and once produced 85,000 pairs of socks for the Army and Navy. C-S Canal locks were modified in 1918 when New York State created the New York Barge Canal System. State engineers replaced five locks with a large two-flight lock - a lift that required a great pool of water for their operation. This spelled the demise of the Flats. Buildings were destroyed or moved to create