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The pedestrian track, constructed from native timbers, is registered as a category 1 historic place and an estimated $400,000 was spent preserving it and putting it in a temperature and humidity-controlled display unit.
The structure was discovered in 2008 during demolition of the former Deka building in George St, where the Wall Street Mall is now situated.
The 12m-long and 4m-wide corduroy causeway, constructed between 1848 and 1859, is the earliest known example of a substantial corduroy road in New Zealand and is considered to have outstanding archaeological significance at a national level.