First Welland Canal reason for the error is not known. On July 4, 1818, Merritt organized a meeting in St. Catharines. The outcome was a petition sent to Upper Canada Legislature to provide for construction of a canal between the Twelve Mile Creek and Welland River. Unlike Merritt's original water-canal plan, the petition included plans for allowing boats to cross the Niagara Escarpment. In 1823, Hiram Tibbetts, an engineer, was employed to make a formal survey for the route. He suggested to dig a channel below the surface level of Welland River between present-day Port Robinson and Allanburg, and then follow the Twelve
Welland Canal ship locks. Seven of the locks (Locks 1–7, the 'Lift' locks) are long and raise (or lower) passing ships by between each. The southernmost lock, (Lock 8 – the 'Guard' or 'Control' lock) is in length. The Garden City Skyway passes over the canal, restricting the maximum height of the masts of the ships allowed on this canal to . All other highway or railroad crossings of the Welland Canal are either movable bridges (of the vertical lift or bascule bridge types) or subterranean tunnels. The maximum permissible length of a ship in this canal is . It takes ships