Problem on the Ashley Bridge (Cones Road)

I was at a meeting that was about to start when a friend (who happens to live in the Waiapara Gorge) came in and said there is a new dip in the Ashley Bridge – the Cones Road one, north of Rangiora.  I rang the Council staff, they went and checked and my friend is right – and, so far, the only motorist to notice. One of the supports near the Rangiora end is settling a bit into the riverbed, mainly on the downstream side.

Staff and consultants are monitoring the bridge.  It is likely that the dip is very recent and while it doesn’t, at this stage, seem that urgent action is required, remedial work is likely to be needed in the future.

This is the Council’s media release.

The Waimakariri District Council yesterday called in consulting engineers to check out the Ashley Bridge following observations of aminor drop in the road surface level.

Consulting engineer Bryan Peters from MWH reported back to the Council yesterday afternoon and confirmed a minor ‘slumping’ of the bridge. This occurrence is typically caused by scouring of the river bed around the piles on which the bridge sits. The phenomenon occurs more particularly following flooding or heavy rain such as has occurred in the District in recent weeks.Mr Peters was confident that safety levels were not significantly compromised by the drop.

Waimakariri District Council Utilities and Roading Manager, Gerard Cleary, says that, following the recommendations of the engineers, safety measures are being put into place which will warn of any further settlement or significant flood flows which could occasion further settlement.

“This bridge was originally built in 1911”, said Mr Cleary, “and is in solid condition for its age. Longer term options and courses of action will be explored once we have received more detailed reports from the engineers”.

 

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