SH1 Mangamuka Gorge - update
Almost two weeks after the closure of SH1 through Mangamuka Gorge, conditions are still highly unstable, and the ground is still moving. Before any repair work can begin, we need to wait for Maungataniwha to settle to ensure the safety of our workers and avoid further movement hindering any repair work.
Two of the major slips under the road are at either end of the Gorge, meaning we’re unable to safely get the heavy machinery or equipment required for any repair work through at this stage.
It’s not just the land on either side of the state highway that has been impacted. The surrounding Maungataniwha Ranges have also sustained a multitude of landslips which is adding to the instability of the road and surrounding area.
The soil in the area is generally crumbly and unstable to begin with, which makes the stability of the land in the gorge particularly susceptible to the effects of severe weather, including heavier rainstorm events.