Waka Kotahi NZ Transport Agency

SH25/SH25A Thames-Coromandel

4 September 2023


Pier B - Piling

SH25A Taparahi progress update

Last week was another busy one for the team on site as the bridge piling continues. Below is a detailed update with extra technical detail for those who like it.

Abutment A: The piles have been completed and cropped down.

Pier B: The working platform (right image below) has been completed, allowing us to mobilise the piling rig and a 100T crane down into the slip. We’re currently installing four 950mm diameter pile casings into founding rock and this week they will be poured.

Pier C: The team has made great progress installing the soil nails (left image below). The working platform is well underway and once completed we will be ready for the piling rig to be moved from pier B to pier C, so piling can get underway.

Abutment D: On the Hikuai side of the bridge, the team has been preparing for the pile work. The first abutment reinforcement has arrived on site, which means work above the ground for constructing the abutment has started. This week, the team has been preparing the reinforcement for the first pour of the insitu concrete works.

Offsite: The first steel girders have completed their time in the fabrication workshop and have been moved to the protective coating booth. This signals the last step in the “offsite” process for this first lot of girders before they are transported from Napier to site.

At the Kōpū yard, the team continues fabrication of the temporary works for the headstocks and columns, forms and falsework.



What’s happening around SH25

As part of our state highway monitoring programme, and ahead of the summer road works season, we had some of our team drive the State Highway 25 Coromandel loop last week checking current sites needing maintenance – such as slips, culverts and bridges. We now have a list of over 70 sites needing maintenance over the coming months. The list is being prioritised to ensure the road remains safe, however many of the sites will be resolved quickly as they are simple fixes such as clearing culverts or trimming trees.

We’d like to reassure you we have a team committed to the maintenance of the Coromandel state highway network.

Summer maintenance season is upon us

Like in our last update, people can expect an increase in traffic management and work crews as they start pre seal inspections, repairs and mark outs. Resealing will get underway from early October, weather permitting.

Our contractors are continuing to clear stockpile areas, making space for the upcoming sealing season’s chip.

We’ll keep you updated as soon as dates are confirmed. In the meantime, if you’d like to see the scale of the work planned around SH25, take a look at this map where is identifies each site.

Waka Kotahi 2023/2024 road works season

Ongoing recovery update

The following locations are a focus for the team this week. If you’re out on the road, please be patient while our crews are carrying work in the following areas:

  • SH2 Karangahake Gorge – clearing slip material, stabilising, slip protection, repairs, scour protection and drainage work.
  • SH25 Ruamahanga Bay – clearing slip material, investigation, stabilising and vegetation clearing.
  • SH25 Thames Coast – clearing and construction of coastal erosion protection structures.
  • SH25 Wilsons Bay – construction of coastal erosion protection structures.
  • SH25 Tararu Rockfill Embankment – construction of coastal erosion protection structures.
  • SH25 Pumpkin Hill and McBeth-Opoutere – drainage improvements and slip repair.
  • SH25 Thornton Bay – construction of coastal erosion protection structures.
  • SH25 Coroglen – slip repair.
  • SH25A – either side of the slip, a programme of work is currently being worked through so it can be completed ahead of the reopening of the state highway.


More information


If there's something you'd like to know more about, or you have a question, we'd love to hear from you. Contact us at coromandel@nzta.govt.nz and we'll include the answers in upcoming issues.

Visit our website www.nzta.govt.nz/thames-coromandel