Project Introduction

State Highway 35 was significantly damaged during Cyclone Gabrielle. The TREC Alliance is carrying out recovery work to restore this road back to two lanes and keep communities connected.

  • Estimated project dates

    Jun 2023–Jul 2026
  • Project type

    Bridge improvements, Bridge replacement, Recovery, Road improvements
  • Project status

    Construction

Project background

We’re carrying out various recovery projects on SH35. A number of them focus on rock protection and culvert reconstructions to safeguard the road and bridges from erosion and surface flooding. We’ll also repair a number of underslips across SH35.

Project status

Some of the other completed projects include Wharekahika (Hick’s Bay) slip repair, Mangahauini River Scour, Turitaka erosion, Oweka underslip.

Complete

  • Mangakuri Stream Bridge

    The bridge abutments and embankments beneath the Mangakuri Stream Bridge were damaged by the impacts of the stream. Rock revetment (protection) work was undertaken to protect the bridge from future impacts of the surrounding waterways.

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  • Mangatuna Culverts 1 and 2

    This culvert reconstruction work has diverted water from the road into surrounding channels, preventing surface flooding. Surface flooding can damage the road, causing potholes and erosion, and poses safety risks by reducing traction and increasing the likelihood of crashes.

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  • Ihungia Road

    We’ve constructed a buttress (wall or support) as well as a new concrete channel and rock lined swale drain to enhance drainage and stability at this location.

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In construction

  • Makatote (Makarika) #2

    A buttress (supporting) structure is being built at this location to repair an underslip caused by Cyclone Gabrielle.

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  • Makatote (Makarika) #3

    A buttress (supporting) structure is being built at this location to repair an underslip caused by Cyclone Gabrielle.

    Close
  • Kopuaroa Slip 1

    A significant underslip at this site requires soil nails and shotcrete (sprayed liquid concrete) to stabilise and rebuild the hillside. It will be a full lane repair and then new guard rail will be installed.

    Close
  • Oweka Underslip

    A buttress will be built here to restore the road shoulder and bring it back to road level.

    Close
  • Whakaari Bluff

    As a result of river erosion an underslip has formed at this site. Rock revetment (protection) work will be undertaken to protect the road from future impacts of the Hikuwai River.

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  • Rotokautuku Bridge (Waiapu)

    Bridge improvement works including repairs to the bearings and cross bracing will restore the damage caused by Cyclone Gabrielle and improve the bridge strength.

    Work to the underside of the bridge including rock revetment to protect the bridge from river scouring is also proposed.

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  • Kopuaroa Stream Bridge

    A significant underslip at this site requires soil nails and shotcrete (sprayed liquid concrete) to stabilise and rebuild the hillside. It will be a full lane repair and then new guard rail will be installed.

    Close

In design

  • Kopuaroa Slip 2

    An underslip at this site requires soil nails and shotcrete (sprayed liquid concrete) to stabilise and rebuild the hillside.

    Close
  • Awatere Gully

    A buttress (supporting) structure is being built at this location to repair an underslip caused by Cyclone Gabrielle. Pavement reinstatement will also be undertaken.

    Close
  • D9 Gully Underslip

    A buttress (supporting) structure is being built at this location to repair an underslip caused by Cyclone Gabrielle.

    Close
  • Waiapu (Rotokautuku) revetment

    Rock revetment (protection) work is planned at this site to repair the area beneath the bridge from damage caused by Cyclone Gabrielle and also protect it from future erosion impacts of the Waiapu river.

    Close
  • Rototahe

    Culvert improvements and raising the road will be undertaken here to prevent future flooding.

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  • Kura o Torere

    Work to repair both an overslip and underslip is required at Tōrere, near Ōpōtiki. Work will involve underslip repairs with an anchored shotcrete wall and overslip repairs with reinforced earth walls and drainage improvements. The team hope to apply for consents in February 2025, with construction expected to start just after Easter.

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  • Mangahauini Gorge Recovery

    Work in the gorge is ongoing. We’ve had the green light to design additional improvements and are working with hapū on solutions to protect the highway from the Mangahauini River by stabilising slopes, repairing river and road edges, and upgrading culverts and drainage.

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  • Mangahauini Sheet Pile wall

    Recovery work at this site will involve retaining wall repairs and erosion protection with rip rap (large rocks) and concrete interlocking blocks.

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