From pyramids to Pontypridd: high-tech survey to uncover secrets of historic bridge

One of Pontypridd’s most recognisable landmarks is set to undergo a cutting-edge survey, using technology previously deployed on the Egyptian pyramids.

Rhondda Cynon Taf Council will begin work on the historic William Edwards Bridge, using advanced muon tomography to explore what lies within the structure without disturbing the centuries-old stonework.

The survey, believed to be one of the first of its kind on a bridge, will help engineers better understand how the 18th-century structure was built. Historical records suggest there may be hidden voids inside the bridge, beyond the six distinctive circular holes visible today.

Built in 1756, the bridge is both a defining feature of Pontypridd and a Scheduled Ancient Monument, making careful preservation essential.

Work will take place over five days from the week beginning April 13, with specialist detectors positioned beneath the bridge in stages. A protective support system will be used to hold the equipment in place, ensuring no damage to the stonework.

The bridge will be temporarily closed during the survey, although the adjacent footway will remain open with slight restrictions.

Muon tomography is a non-invasive technique that measures naturally occurring particles from space, allowing engineers to effectively “see” inside solid structures. It has previously been used to investigate pyramids, volcanoes and underground tunnels.

A spokesperson for Rhondda Cynon Taf Council said: “William Edwards Bridge is a really special part of Pontypridd’s history, and this survey gives us a rare opportunity to learn more about it while treating it with the care it deserves.

“What is particularly exciting about this work is that it allows us to look inside the bridge without causing damage to the stonework. For a structure of this age and importance, that is a huge step forward.

“We want this bridge to be protected not just for today, but for future generations too. The more we know about how it was built and what is happening inside it, the better placed we are to look after it for many years to come.”

The council is working alongside specialist consultants Bill Harvey Associates to carry out the investigation, with further information available at Pontypridd Museum.

The bridge is expected to reopen by Friday, April 17.