Mount Ruapehu has erupted multiple times, causing sludge to flow down the river. In February 1862 James Coutts Crawford was given several old songs and various accounts of the taniwha in the river.[3] Flooding was recorded following the 1889 and 1895 eruptions.[4]
The sudden collapse of part of the Ruapehu crater wall on 24 December 1953 led to New Zealand's worst railway accident, the Tangiwai disaster. A lahar – a sudden surge of mud-laden water – swept down the river.[5]
On 18 March 2007, the mountain crater lake burst, sending an estimated 1.29 billion cubic metres of water, mud, and sludge down the river. The Lahar was 50% bigger than the 1953 Lahar that caused the Tangiwai disaster, but the Ruapehu ERLAWS alarm was successfully activated preventing any accidents.[6][7]
Education
Whangaehu School is a co-educational state primary school for Year 1 to 8 students,[8] with a roll of 27 as of August 2024.[9]
^Conly, Geoff (1991). Tragedy on the track : Tangiwai & other New Zealand railway accidents. Grantham House. ISBN978-1-86934-008-7.
^Wunderman, R (2007). "Report on Ruapehu (New Zealand) — March 2007". Bulletin of the Global Volcanism Network. 32 (3). Smithsonian Institution.
^Becker, JS (2017). "Organisational Response to the 2007 Ruapehu Crater Lake Dam-Break Lahar in New Zealand: Use of Communication in Creating an Effective Response". Observing the volcano world: volcano crisis communication. Barcelona: Springer. pp. 253–269. ISBN978-3-319-44095-8.
NR - consists of former Taihape Ward and partially northern part of former Hunterville Ward since 2019; CR - consisted of former Marton Ward, most of southern part of Hunterville Ward and partially northern part of Turakina Ward since 2019; SR - consisted of Bulls Ward and most of southern part of Turakina Ward since 2019