History of King's Highway 58A:
King's Highway 58A is an arterial highway in the Regional Municipality of Niagara which connects Highway 58 in Welland to Highway 140. The highway essentially serves as a bypass around the south side of Welland. Highway 58A was first established in the mid-1970s, when the Townline Tunnel Road and its approaches were designated as a new provincial highway. The route was officially designated as a King's Highway by an Order-in-Council, effective August 21, 1974. The Townline Road Tunnel had been constructed a few years earlier during a Welland Canal diversion project undertaken by the St. Lawrence Seaway Authority. The route of Highway 58A has not changed since it was first established in the 1970s.
Highway 58A is a two-lane limited-access highway from Welland to Highway 140. While there are no interchanges located along the highway, there are very few major at-grade intersections. Services are located in Welland, but they are not situated directly on Highway 58A. The speed limit on Highway 58A is 80 km/h (50 mph), unless posted otherwise. Motorists wishing to access westbound Highway 58A should note that the turnoff for this route actually joins Highway 140 from the east. This is because Highway 58A loops around and passes beneath Highway 140 on its way to the Townline Tunnel at the Welland Canal. The Townline Tunnel passes below the Welland Canal and is operated by the St. Lawrence Seaway Authority. There are no tolls charged for using the Townline Road Tunnel. Please visit the Highway 58A Mileage Chart page for a list of mileage reference points along Highway 58A.
Additional Information About King's Highway 58A: