Mangamuka Gorge Slips and Rehabilitation (Emergency Response)” is a finalist in the Sustainability Award category at the 2024 Āpōpō Awards.

This project embodies the harmonisation of diverse components; the intricacies of narrow work areas, the precision of heavy machinery, the complexity of piling works, and the reverence for iwi, hapū, and the environment. It is a narrative of adaptability, innovation, and stewardship, where challenges have been metamorphosed into opportunities, all while building resilience on State Highway 1 in Northland.

All involved: CLL Solutions ltd., WSP, Waka Kotahi, and Stellar Projects

The slip repair project on State Highway 1 between Kaitaia and Mangamuka addresses challenges posed by landslides and unstable terrain in the Maungataniwha Ranges after the August 2022 weather event. 15 critical slips and unstable terrain led to road closures, detours, and longer travel times, impacting local lives and businesses. The project aims to restore highway stability, requiring geological assessments, engineering evaluations, and innovative construction techniques to prevent future slips. Community engagement is crucial, ensuring alignment with local needs and concerns through updates, meetings, and transparent communication. Environmental preservation is key, given the area’s biodiversity and its classification of being an area of outstanding natural landscape, necessitating proper waste disposal and erosion control. Beyond construction, the project signifies a commitment to improving connectivity, safety, and quality of life. By addressing natural challenges and preserving the region’s beauty, it aims to leave a lasting positive impact on the community and environment.


 The project commenced in February 2023, following the identification of landslides and unstable terrain on the Mangamuka Highway, triggered by the August 2022 weather event. Recognizing the urgent need for repairs, stakeholders initiated discussions to address the challenges posed by the slips.

Consultation and Community Engagement:
Extensive consultation and engagement sessions were held with local communities, iwi, hapū and stakeholders to gather input, address concerns, and ensure alignment with their needs and aspirations. Regular updates, public meetings, and transparent communication channels were established to keep stakeholders informed throughout the project lifecycle.

Design and Planning:
A multidisciplinary team comprising engineers, geologists, environmental experts, and cultural advisors collaborated to develop a comprehensive design and planning strategy. This involved geological assessments, engineering evaluations, and the integration of cultural and environmental considerations into the project design.

Management and Governance:
Effective project management and governance structures were established to oversee the implementation of the repair works. Clear roles and responsibilities were defined, and regular progress monitoring mechanisms were put in place to ensure adherence to timelines, budgets, and quality standards.

Community and Iwi Engagement:
Community and iwi engagement remained integral throughout the project, with ongoing dialogue and collaboration to address emerging issues, incorporate feedback, and foster positive relationships between all stakeholders involved.

By adhering to a structured and inclusive approach, the Mangamuka slips repairs project not only addressed immediate infrastructure challenges but also strengthened relationships, built community resilience, and enhanced the overall well-being of the region.

The Sustainability Award is proudly sponsored by Morphum Environmental