The Wanganui River is in the West Coast of the South Island of New Zealand. It flows northwest for 55 kilometres (34 mi) from its headwaters in the Southern Alps, entering the Tasman Sea near Lake Ianthe, 40 kilometres (25 mi) southwest of Hokitika.

After heavy rain in January 2013 the flooded river partially washed away the single-lane road bridge that carries State Highway 6, closing the only through road on the West Coast.[1]

Gravel buildup has gradually raised the riverbed, and in 2021 the West Coast Regional Council planned to elevate stopbanks by 1 m at a cost of $5.7 million to protect neighbouring farmland from flooding. Farmers protested the rates rise that would be needed to pay back this 30-year loan, and suggested the Department of Conservation should contribute.[2]

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[de] Wanganui River