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 led by George Hay, 8th Marquess of Tweeddale, met an American raiding party, numbering approximately nine hundred, near the eastern edge of the present community during the Battle of Cook's Mills. After an intense skirmish, the Americans retreated to Buffalo, New York. Cook's Mills was the second to last engagement of the War of 1812 on Canadian soil. The First Welland Canal was extended in 1833 to reach Lake Erie and has influenced development of this city ever since. A wooden aqueduct was built to carry the Welland Canal over the Welland River at what is now downtown Welland, and