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 out of Welland, leading north to Thorold, St. Catharines and onwards via Queen Elizabeth Way. Port Colborne is linked to Welland by Highways 140 and 58. Port Colborne residents then can take the 406 further north. The Mid-Peninsula Highway, once constructed, can play an important role in the transportation patterns of Welland, as it might cross the Welland Canal along the Highway 58A corridor in the south of the city. Should that occur, Highway 406 will likely be extended to reach the new thoroughfare. Two of the three tunnels under the canal, Main Street Tunnel and Townline Tunnel, are located