Thunder Creek Falls is one of the highest, most easily accessible waterfalls in New Zealand at 98 metres. The car park is on the side of State Highway 6, about a km or so after you pass over the Gates of Haast bridge heading west. It is only a few minutes walk to the Haast River and viewing platform, with the Falls directly opposite.
Though they are best seen in the wet when the water flow is at its maximum, it would be easier to get to the base on the other side of the river with a lower water flow if that is your goal.
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