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 Canal a proposed new canal, titled the Fifth Welland Canal, which was planned to by-pass most of the existing canal to the east and to cross the Niagara Escarpment in one large 'superlock'. While land for the project was expropriated and the design finalized, the project never got past the initial construction stages and has since been shelved. The present Welland Ship Canal was originally designed to only last until 2030, almost 100 years after it first opened, and 200 years since the first full shipping season, in 1830, of the original canal. Subsequent improvements to the canal infrastructure mean that