The 6th highest viaduct in New Zealand is the 73 m high, 160 m long Kawhatau viaduct spanning the Kawhatau River. It is the middle viaduct on the Mangaweka Deviation opened in 1981, and is of almost identical construction and dimensions as the North Rangitikei Viaduct described above. The central span is a clear 110 m long, the longest equal span of any railway bridge in New Zealand.