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Manawatu Gorge Slip

The Manawatu Gorge Slip is the largest road slip in New Zealand history.

Project Overview

Manawatu Gorge section of SH3 is a vital link between the eastern and western regions of the lower North Island.  On 18 August 2011 this link was severed by a large landslide, followed by other significant slips.  The project to reinstate SH3 was huge.

Higgins Role

As the lead contractor, Higgins was responsible for project management and ultimate project completion including coordination with consultants and subcontractors; management of the slip works and communication with NZTA and other key stakeholders. To stabilse the slope, five massive benches were built from the top down, each longer than a rugby field.  A track was built through bush at the top of the slope so equipment could be brought in.  Staff began the work at a height of 155 metres above the road.

In May 2012 the benching was completed and the road was cleared.  A total of 370,000 cubic metres of soil, rock and debris was removed from the site. Stage two then began to fix the road bridgework damaged by the slip.  A truely collaborative team environment delivered this technically complex task in four months - an operation that would normally take up to a couple of years to plan and build.

This project received the NZTA GEM (Going the Extra Mile) Award in 2012 for excellent customer service during an event or incident.   In 2013 the project team also won the Roading New Zealand Excellence Award in the category medium sized road project as well as being highly commended in the NZ Contractors Federation Awards – category 3 Projects between $5m - $25m.