Welland Canal and crossings are numbered from north to south. The following illustration depicts the profile of the Welland Canal. The horizontal axis is the length of the canal. The vertical axis is the elevation of the canal segments above mean sea level. If assigned by the St. Lawrence Seaway Authority. The original bridges across the fourth canal were numbered in order. Numbering was not changed as bridges were removed. Welland Canal The Welland Canal is a ship canal in Ontario, Canada, connecting Lake Ontario and Lake Erie. It forms a key section of the St. Lawrence Seaway. Traversing the Niagara Peninsula
First Welland Canal south of it were easy to dig in, but work was accelerated during mild weather of late 1832 and early 1833. On June 1, 1833, the schooner "Matilda", headed for Cleveland from Oakville, became the first ship to travel through the new channel. Overall, the combined Welland and Feeder Canals stretched between the two lakes, with 40 wooden locks. The minimum lock size was 33.5 m by 6.7 m (110 ft by 22 ft), with a minimum canal depth of 2.4 m (8 ft). Today, very little of the First Canal is evident. Much of the Feeder Canal, however is