Moeangiangi

Timeline

Feasibility study

A feasibility option study has been conducted, where potential solutions for Moeangiangi bridge rebuild have been assessed. The feasibility report covered the condition of the original structure, damage caused by the cyclone, and a feasibility assessment of multiple bridge and alignment options. The feasibility report was based on the following:

• Geometrics
• Hydrology and climate effects
• Geotechnical/geology considerations
• Environmental considerations
• Constructability
• Cost
• Social impacts
• Other factors

The proposed bridge will be a like-for-like replacement of the original structure (i.e. single lane bridge) with no cycle/walking provisions. Using minimum widths this equates to a bridge width of 5.1m. An overall bridge length of 48m is anticipated, with the increased bridge length accommodating the anticipated increase in flood levels.

Key points for consideration

Design consideration: The bridge design will consider constructability, temporary access, safety in design, and residual operational risk management. The design working life is 100 years, as required by the NZ Bridge Manual.

Longer spans and fewer columns: Whenever feasible, the bridges will incorporate longer spans and fewer columns in the water. This design approach aims to reduce the risk of flow blockage caused by debris and slash during flood events. However, earthquake resilience is also a major consideration.

Project timeline: The goal is to begin construction on a permanent replacement structure by early to mid-2028.