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, bridge 13 set to one side of the canal. This was turned manually by pushing on heavy wooden beams extending from the end of the bridge. The bridge over the Second Welland Canal (constructed 1840 to 1845) is recorded in at least one image (shown at left), which has been seen in several books, in the Welland Library and on a post card. This was a swing bridge of a design common to other locations on the second canal. It can be seen from the picture that the pivot was to the west of the canal. These bridges were painted white and