At the beginning of the 20th century the only means of crossing the river Mersey at Runcorn Gap were by rail on the Runcorn Railway Bridge (which also had a footpath) or by using the ancient ferry (a rowing boat). In the 1890s the Manchester Ship Canal had been constructed and this meant that the journey by ferry had to be made in two stages, with a climb over the wall of the canal between the stages. A road bridge was clearly needed but it would have to pass high enough over the canal to allow the passage of ocean-going ships. The cost of doing this was felt to be prohibitive.