A Winter of Change
Damage to the Dam at Kidwelly Old Tinplate Works
After the relentless winter floods of 2025, intense rainfall from Storm Claudia led to the dramatic collapse of a major section of the historic dam at Kidwelly Old Tinplate Works.
We believe this was caused by exceptionally high water levels overtopping the structure, washing away part of the dam on its western side. This section was not original to the 18th-century site, having been rebuilt in the 1980s after an earlier failure.
From a distance, much of the main masonry dam wall and its characteristic arches appear to remain in place. However, the true extent of the damage is still not fully understood.
The flooding has also left a wider legacy across the site. Debris, silt and vegetation have built up within the water channels, parts of the culvert have collapsed, and some structural elements, including paths and historic structures have been undermined. These changes have altered how water moves through the site and present ongoing risks to people accessing the site.
As a Scheduled Monument of national importance, the dam and surrounding landscape are protected. This presents a complex challenge and means that any work to investigate, clear or repair the site must follow a formal process. Scheduled Monument Consent from Cadw will be required, alongside a Flood Risk Activity Permit (FRAP) from Natural Resources Wales for any work within the river channel.
Before these permissions can be applied for, we need a clearer understanding of the damage to plan a methodology that balances flood risk, heritage and ecological considerations, and practical site management. This will involve specialist surveys, including structural assessments, heritage impact assessments, topographical mapping and potentially underwater inspections. At present, we are seeking funding to commission this essential work, which will form the evidence base for future plans.
In the meantime, safety is our top priority. The dam is an unstable structure, and the surrounding area includes deep water, hidden voids and fast-moving currents. For their own safety, members of the public must not attempt to access the dam or enter the river channel.
We will continue to share updates as we learn more about the condition of the site and as plans for its future begin to take shape.