 In 2004, Parks Canada on behalf of the federal government added the project to Canada’s tentative list of potential World Heritage Sites, under criteria (v), (vii), (ix), and (x).The site was submitted for consideration in 2013.The World Heritage Committee deferred inscription to give the nominators time to improve certain aspects of the bid, while also saying that the Committee needed to improve the nomination process for mixed sites as there were currently structural problems in the process that made approving mixed nominations difficult.