 The history of Highway 58 is tumultuous due to various relocation projects resulting from the construction of the fourth Welland Canal and Highway 406 . Prior to 1997 , Highway 58 was continuous and travelled through the west side of Welland , maintained under a Connecting Link agreement . The route was first established in 1935 , though it remained unnumbered on the 1935 and 1936 official road maps . By 1937 it extended from Port Colborne to St. Catharines , though the route it travelled between those places shifted several times over the following 30 years . In the late 1990s , the Ministry of Transportation of Ontario ( MTO ) transferred several highways or portions of highways throughout the province to lower levels of government . Highway 58 was decommissioned through Welland on April 1 , 1997 . 
