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 Wainfleet, and had made significant progress before Deep Cut work was resumed the following April. However, the rains continued. On November 9, 1828, just two weeks' worth of work before completion of the Deep Cut, the banks of the cut near Port Robinson collapsed into the excavated channel, killing an unknown number of workers below. More landslides followed, and it soon became evident that making a cut deep enough as to use the Welland River as the source of canal water would not be possible. An alternate, sufficiently high source of water was necessary. Since the construction of a channel