SH29 Ōmanawa Bridge Replacement

The bridge carries State Highway 29 over the Ōmanawa River on the main route between Tauranga and the Waikato. The replacement is being built alongside the existing structure while the highway stays open, which puts traffic management, staging and the settlement behaviour of the approaches at the centre of nearly every decision.

I’ve been on it since September 2025 through Axell Consultants, as Engineer’s Representative and as Assistant Contract Administrator. I prepare the assessments, certifications, decision papers and reporting. The Contract Administrator reviews and signs the determinations and payment schedules.

Where it is at

The piling, piers and abutments are done and the superstructure started on 9 October 2026, when the first section of steel beams was lifted onto the pier. The 6 sections weigh 50 to 56 tonnes each and go in with a 1200 tonne telescopic crawler crane, the biggest of its type in New Zealand. The precast deck panels follow once the steel is in and the bearings are grouted.

What that has involved so far

• Payment claims 1 to 13, reviewed item by item and prepared for certification, including NZTA Schedule 17 cost fluctuation. I set out the cost fluctuation method the contract now works to
• Variations 1 to 8 and 2 extension of time claims, assessed against the accepted programme with delay attributed day by day from the site record
• The float treatment memo the contract uses for programme assessment
• 55 weekly reports, 14 monthly reports and dashboards to NZTA and 42 sets of progress meeting minutes
• 9 risk reviews with NZTA, the contractor and the designer, with the project risk register kept in NZTA’s Active Risk Manager
• Weekly health and safety and environmental inspections plus pre and post adverse weather inspections. A review of the contractor’s health and safety management plan against NZTA Z05
• Decision papers on the western tie in settlement period and on the Ōmanawa Road intersection works, each with costed options and a recommendation

How the delay, settlement and hold point questions on a job like this get worked through is on the how I work page. For how the delegation itself works, see what an Engineer’s Representative actually does under NZS 3910.

Project details