Collapse of masonry arch bridge during construction works

Stock photo

London, United Kingdom

A 300-year-old three‑span masonry arch bridge collapsed after a flash‑flood event scoured the bridge foundations. Construction works were underway at the time to upgrade the bridge deck, leading to a dispute between the local council and the main contractor.

I was asked to determine the root cause of collapse and the failure mechanism. This work included assessing the interaction between the bridge strengthening works and flash-flood hydraulics, and evaluating whether risk management and flood‑response measures were adequate and in line with permits and guidance.

The findings of this investigation were provided to the solicitors advising the local council, to inform liability position and remediation strategy.