 The first portion of what became Highway 58 was assumed on September 4 , 1935 . Although only a short stub travelling south from Main Street in Welland ( then Highway 3A ) , it connected to a road owned by the Welland Canal Authority ( WCA ) travelling along the east side of the old canal , now known by various names including Barber Drive , Canal Road , Kingsway , and Canal Bank Street . Initially unnumbered , the route was extended to Port Colborne and St. Catharines on October 6 , 1937 , and by then had been given the designation of Highway 58 . It now began at Highway 3 in Port Colborne and travelled to Welland along the east side of the canal , and thereafter north along Niagara Street , the Merrittville Highway and <unk> Road ( Niagara Regional Road 50 ) to Highway 8 in downtown St. Catharines . 
