Closing the Gaps

Work to close the two remaining gaps in the secondary stopbanks system for the Ashley River/Rakahuri is to take place in the coming months.

This work is the completion of the Ashley River/Rakahuri secondary stopbanks system, a project that provides significant benefit to Rangiora, and the wider district, in the form of a more resilient flood protection scheme.  Major roadworks will occur to raise sections of the road by three metres on Cones Road and Millton Ave where the gaps are, and will require road closures.

Work information

  • Exact timing of the work will be confirmed in the next two weeks. It will be carried out in stages from approximately mid-June through to November 2018.
  • A route from Rangiora to the bridge will remain open throughout the work period, with detours clearly signposted.
  • No work will start on Millton Ave until the work on Cones Road is complete and the road reopened.
  • There will be minimal disruption to motorists as a result of the work being undertaken.
  • The current speed limits will be maintained on both Millton Ave and Cones Road once work on each is completed.
  • Access to the dog park and BMX recreation area will not be impacted by the work.

The history

  • This project relates to the construction of the secondary stopbanks built in the area referred to as ‘Breakbank’ on the south side of the Ashley River/Rakahuri, near the Rangiora traffic bridge and rail bridge.
  • Construction of the stopbanks was initially completed in two stages, between May 2013 and March 2015.  Stage 1 involved work located upstream of Milton Avenue, and Stage 2 covered the work located between Milton Avenue and the rail bridge.
  • The design for the secondary stopbanks is to cater for a 500m3/s breach of the primary stopbank system upstream of the traffic bridge.
  • The stopbank system provides significant benefit to Rangiora, and the wider district, in the form of a more resilient flood protection scheme.  The last major flood which breached the primary stopbank at this location was in 1953, and significant growth has occurred on the floodplain since then, so this is a crucial part of the ongoing evolution of flood protection from the Ashley River.

Contact: Environment Canterbury

Phone: 0800 324 636

Email: ecinfo@ecan.govt.nz