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 9, 1841 at Lock No. 37 (Allanburg) of the First Welland Canal () (approximately 180 m north of today's Allanburg bridge), when an explosive charge destroyed one of the lock gates. However, a catastrophic flood was prevented when a guard gate located upstream of the lock closed into place preventing the upstream waters from careening down the route of the Canal and causing further damage and possible injury or loss of life. It was suspected that Benjamin Lett was responsible for the explosion. On April 21, 1900 about 6:30 in the evening, a dynamite charge was set off against the