State Highway 1 at Maromaku is now fully restored after a $3.25 million repair of a massive slip that closed the highway during storms in July last year.

The slip resulted in the highway being closed for seven days and requiring a temporary route to be built.

Since then roading body NZ Transport Agency (NZTA) has been working on a permanent fix and, this week, the repair job was finally finished.

The slip on State Highway 1 at Maromaku shortly after a slip left it impassable in July last year. Photo / Supplied
The slip on State Highway 1 at Maromaku shortly after a slip left it impassable in July last year. Photo / Supplied

NZTA safety and network performance manager Tim Crow said the newly completed rebuild and strengthening work meant the main route between Whangarei and Kawakawa would be safer and more resilient.

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The rebuilt section of the state highway south of Kawakawa has now opened fully to traffic.

Mr Crow says repairing the slip and making the road safer and robust for the future has been a top priority for the NZTA and it has been fabulous to see the newly rebuilt section of the road completed.

"We have built a new stabilised-earth retaining wall to support the rebuilt road, installed safety barriers and extra culverts for better drainage, which will make the road safer and more resilient to the heavy Northland rainfalls," he said.

At the height of the July, 2014, storm a slip also closed Mangakahia Rd through the centre of Northland, meaning the only decent roading access to the far north was via SH12, meaning several hours more travelling for some motorists.

The $3.25 million Maromaku repair has involved moving more than 3000 tonnes of material as well as 39 reinforced concrete piles driven 21 metres into the ground.

Mr Crow says NZTA is grateful for the support and patience from the community and those using this section of the state highway while the work has been carried out.