Welland Canal Port Maitland. With the opening of the extension, the canal stretched between the two lakes, with 40 wooden locks. The minimum lock size was , with a minimum canal depth of . Deterioration of the wood used in the 40 locks and the increasing size of ships led to demand for the Second Welland Canal, which used cut stone locks, within just a few years. In 1839 the government of Upper Canada approved the purchase of shares in the private canal company in response to the company's continuing financial problems in the face of the continental financial panic of 1837.
Welland name when it was incorporated on 25 July 1858. It became a city in 1917. One of the few railway crossings across the canal was near Welland. Together with the canal, these two factors attracted the development of heavy industry in Welland. In 1906 the Plymouth Cordage Company was the first major industrial company to open a plant in Welland. By the 1930s, Welland was an important industrial city in the region and was developing rapidly. In the 1960s, the city was starting to outgrow the canal passing through its core. The Welland By-Pass project, started in 1967 and finished