 The canal was never considered a success, its use limited by the shallow draught of the vessels that could use it, constant silting, tidal factors and the advent of commercial road transport in the 1930s.This change became permanent when the two lifting span bridges that crossed the Canal were altered to become fixed in the 1930s.By the early 1940s the navigational use of the canal declined to such an extent that it was decided not to maintain the wharves and they were demolished.