Trig Road North Upgrade
Culvert replacement update - late November
Work to replace the old culvert on Trig Road North is well underway. The team is currently busy diverting the stream and constructing its replacement.
Preparations for the new precast concrete culvert - late November 2025Where are we at?
Recent severe weather events have slowed our programme slightly, but the crew is working hard to keep us on track. Our goal remains to reopen Trig Road North by 12 December 2025, and we are doing everything we can to meet that date.
In the meantime, the full 24-hour road closure remains in place. Please continue to use the detour via Golden Valley Road and plan your journey accordingly. Drive carefully near the work site and check here for further updates.
We appreciate your patience and cooperation while we complete these essential works to improve local infrastructure.
Aerial shot of culvert improvement works - November 2025
Road improvement update - November 2025
Work on Trig Road North is progressing well. All fence relocation is now complete. Drainage improvements are ongoing and earthworks are underway, as the road is being widened from 4.8m to 6m.
Once again, thank you for your patience as we continue enhancing Trig Road North.
The photos below show the latest phase of our upgrade journey.
November 2025 - Road widening in progress
Drainage improvements are underway...
Drainage improvements are underway...Traffic Management for both projects
Road closure: From mid-October to early December, Trig Road North will be closed to through traffic while the new culvert is built. A detour will be available via Golden Valley Road.
Stop/Go: In the road improvement zone, Stop/Go traffic control will be in place during work hours.
Speed limits: When the road is open, there will be a temporary 30 km/h speed limit. Some parts may be bumpy or unsealed while under construction, so please drive carefully.
Work hours: Mon-Fri, 7am–7pm (occasional weekend or night work may be required).
A big thanks in advance
We appreciate your patience and cooperation while we carry out these important upgrades and we apologise for any inconvenience caused.
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What's happening with the culvert and the road?
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Road Rehabilitation
A 1.5 km stretch of Trig Road North (from property #45 to just before property #186) will be widened from 4.8 metres to 6 metres, creating a safer and more user-friendly route. The work will include:
- Significant road widening and alignment improvement (including fencing relocation)
- Installing stormwater drains
- Building up the road base
- Final surfacing
When: Early to mid-October 2025 through to March 2026
Who’s doing the work: HEB Construction
Culvert Replacement
At the same time, we are also replacing an old, corroded culvert, located on Trig Road North around 250m from the Waihi Beach Road intersection. Its replacement will be a new, stronger concrete culvert that ensures the long-term safety and stability of the road. As this culvert carries a tributary of the Ohinemuri River, the stream will need to be temporarily diverted to replace the old culvert with the new one.
When: Mid-October to early December 2025 (about 8 weeks)
Who’s doing the work: Ventia
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