Birchville Dam
The 928th tallest dam in the world
Birchville Dam is believed to be the second unreinforced concrete arch dam built for water supply in New Zealand. It was built in 1930 for the Upper Hutt Borough Council to provide increased water capacity for the borough and replaced a water supply weir built in 1913–1914 at the same location on Clarke's Creek, near Birchville. Decommissioned in 1958, when Upper Hutt joined the Wellington regional water scheme, this dam is now an historic attraction on the Cannon Point Walkway. This dam does not appear in the New Zealand Dam Inventory (1994).
Dam data from Wikidata (CC0) plus curated additions. Summary from Wikipedia (CC BY-SA).