A few facts from a government site called HistoricPlaces.ca:
Port Dalhousie Heritage Conservation District
Formally Recognized: 2003/03/03
The District preserves the historic street plan with its orientation to the canal and harbour, the shipyard and the lakeshore. The principal east-west streets (Main Street, Dalhousie Avenue and Bayview Avenue) are primarily residential. The commercial core, the canal and harbour area, Lakeside Park and the beach, and the Royal Henley Regatta course have all been maintained as important heritage components.
Sources: City of St. Catharines By-law 99-380; Port Dalhousie Heritage Resource Inventory, St. Catharines Heritage Committee, 1998