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Project introduction

The NZ Transport Agency is replacing the Old Mangere Bridge with a safe, high-quality walking and cycling connection between the Onehunga and Mangere Bridge communities and a safe place for fishing. An alternative route, the SH20 Manukau Harbour Crossing, has been upgraded and improved.

  • Estimated project cost

    $25 million+
  • Project type

    Bridge replacement
  • Project status

    Construction

Benefits

The new bridge will ensure the walking and cycling connection is maintained for the local communities between Ōnehunga and Māngere Bridge.

The new bridge will be at least eight metres wide – and up to 12 metres in some bays to enable fishing. The new structure will curve towards the motorway bridge and will be high enough for small boats to pass underneath.

The new bridge will be constructed next to the old bridge using the same abutments – but further away from the port.

About the project

The existing bridge is over 100 years old and, as expected with a structure this old, the bridge’s condition has been deteriorating for some time.

The Transport Agency will replace the old structure with a high-quality bridge that continues to serve the people using it.

Between 2012 and 2016 we worked on preparing to build a new bridge. This included talking to the community and getting a resource consent from Auckland Council.

The valuable community feedback has helped us shape the design and layout of the new bridge.

 

Project timeline

2005-2011 Safety strengthening works to the Old Māngere Bridge. Regular monitoring inspections by the NZ Transport Agency’s Auckland Motorway Alliance (AMA) in its role as a bridge consultant.
2012-2014 Design and community consultation for the replacement Old Māngere Bridge.
2015 Due to a noticeable visual change in its condition, a full tactile principal inspection was carried out in December 2015, which catalogued the main defects on the structure.
2016 Consents lodged with Auckland Council for the replacement Old Māngere Bridge.
Early-2016 Council hearing and appeals process for the replacement Old Māngere Bridge.
In January, a further assessment indicated that the outer part of the structure is deficient and a large load in these areas could place it under enough pressure to pose a risk to public safety.
Mid-2016

Consents granted from Auckland Council for the replacement Old Māngere Bridge.
In June, a fence was installed on either side of the central walkway to prevent loading to the edges of the bridge where crowd load would pose a risk to public safety. This enabled the bridge to remain open and the structure has undergone both weekly walk overs and monthly water inspections, in addition to real-time monitoring to assess the bridge condition.

2018 Improvements to the underpass, next to the Manukau Harbour Crossing motorway structure, to enhance the alternative route until the new bridge is built.
26 November, closure of the Old Māngere Bridge.
2019 Construction of the replacement bridge begins

 

Key features

Some of the key features of the bridge have been refined, as a result of community feedback. The bridge design includes:

  • at least eight metres wide – and up to 12 metres in some bays to enable fishing activities
  • new structure curving towards the motorway bridge
  • high enough for small boats to pass underneath
  • constructed next to the old bridge using the same abutments – but further away from the port
  • reflecting the area’s history and values into the design – two artists are developing this through art.

 

Frequently asked questions

Read the list of frequently asked questions

 

How do I find out more?

Contact the project team, email omb@nzta.govt.nz

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