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.
First Welland Canal a straight cut across the Wainfleet Marsh. The location chosen for the aqueduct across Welland River was not Port Robinson. Although the Welland Canal and River first met in Port Robinson, it was decided to dig the canal essentially parallel to the river for a couple of kilometers upstream before crossing it. The aqueducts of three subsequent canals were later built in the same spot. Once again, many of the Deep Cut labourers were transferred to the Feeder cut. The digging was finished in the span of 177 days, which was a large achievement at the time. Lake Erie water