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Bridge & Culvert Strengthening

Bridge & Culvert Strengthening:

Following the HPMV Evaluation in accordance with the NZTA Bridge Manual of twenty (20) bridge and culvert structures on Porangahau & Wimbledon road as part of the Porangahau and Wimbledon Roads PGF Project, a total of eight (8) structures have been identified as not being capable or carrying full HPMV vehicle loading.

The Porangahau and Wimbledon Road Upgrade will include projects to strengthen these structures to provide future generations with safe and durable roading infrastructure along what is a key thoroughfare in our district.


Sixty Pound Bridge Status Reports:

  • September 2021:Design Complete and timing TBC

You can view a map of the progress here


Wallingford BridgeStatus Reports:

You can view a map of the progress of this project here

  • February 2021: Concrete Structures are now onsite to complete strengthening work at Wallingford Bridge. Traffic management has been set up, the bridge deck surface milling is complete and the team are just finishing scaffold installation. This week Concrete Structures will finish scanning and marking all the drilling locations and existing reinforcement, ready for the drilling.
  • March 2021: Our bridge upgrade programme is in full swing and the team are 50% of the way through the drilling of nearly 4000 holes to install bolts that will connect the new deck of the bridge to the existing deck structure. We were able to recently take the MBIE provincial development unit out for a site visit!

This first bridge upgrade is currently employed by an all CHB local team and has one new employee through the Mayors Taskforce For Jobs, with another looking to start this week. We expect to start works on the next bridge ‘Kokomoko’ in the next month.

  • April 2021: Strengthening work on Wallingford Bridge is progressing well by the Concrete Structures team. The new concrete has now been poured on the Waipukurau bound lane and deck steel has been installed.
  • May 2021: Update 1- 3 May, 2021:The north bound lane has been completed, and the south bound lane is about to be poured, the project is on track to be completed by late May 2021, the team will then move onto Kokomoko Bridge.
  • Update 2 - 25 May, 2021:Strengthening work is nearing completion at Wallingford Bridge, with the deck reinforcement now complete. The team is now completing finishing touches on site, including chip sealing, constructing the approaches to the deck and installing the guardrail. Resealing and line marking will happen when the weather is more stable.

Wallingford Bridge 2

Wallingford Bridge 3 


Kokomoko Bridge 1Status Reports:

You can view a map of the project's progress here

September 2021: Following the completion of an assessment of the bridge it was determined that to make the Porangahau Road/Wimbledon Road route HPMV capable Bridge 174 Kokomoko would require strengthening.The proposed works are to strengthen the abutments by installing concrete columns directly to the front face to enable the abutments and beams to work together. A Traffic Management Plan will be developed to implement the restriction of the bridge to a single 3.7m wide central lane with a 10km/h speed restriction in order to keep the road open and safe for use.
The traffic management and width restriction on the bridge will be kept in place until strengthening works of the bridge have been completed.

Kokomoko Bridge 2


Saleyards Bridge 1

Status Reports:

You can view a map of the project's progress here

September 2021: Design complete


McKenzies CulvertStatus Reports:

You can view a map of the project's progress here

September 2021: Scoping of project complete


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