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Former Dam of Cwmcarn Canal Reservoir is a post-medieval to modern hydraulic engineering structure built across the valley floor in Cwmcarn, Wales. The dam was constructed to impound water for the canal system serving the local industrial economy, exploiting the coal-bearing landscape of South Wales. The site sits upon the South Wales Upper Coal Measures Formation, a sequence of mudstone, siltstone and sandstone interspersed with coal seams and ironstone deposits laid down during the Westphalian period. This geology directly shaped the industrial development of the region and the location chosen for the reservoir.
The dam's construction took advantage of natural valley confinement provided by the surrounding topography. The upper coal measures strata, capped locally by ferricrete, offered substantial bedrock onto which the structure could be founded. The reservoir served to regulate water supply for canal navigation and mill operations dependent upon the canal infrastructure, reflecting the integrated water management practices of Wales's industrial heartland.
The monument is protected by Cadw, the Welsh heritage monuments service, and is recorded under reference MM259. It survives as evidence of the engineering solutions developed to support the region's coal and iron industries during the post-medieval and modern periods, when water management became essential to industrial productivity in South Wales.
Former Dam of Cwmcarn Canal Reservoir is a scheduled monument protected by Cadw under reference MM259. View the official record →
Former Dam of Cwmcarn Canal Reservoir is a post-medieval to modern hydraulic engineering structure built across the valley floor in Cwmcarn, Wales. It is designated a Scheduled Ancient Monument by Cadw under reference MM259.
Former Dam of Cwmcarn Canal Reservoir dates from the post medieval/modern period, and is classified as a dam. It is one of over 32,000 scheduled monuments protected across the UK.
Former Dam of Cwmcarn Canal Reservoir is a Scheduled Ancient Monument, legally protected by Cadw — the body responsible for designating and safeguarding heritage sites in Wales. The official designation reference is MM259.
Several scheduled monuments lie within 10 km, including St. Michael's Churchyard Cross, Machen (5.5 km), Ruperra Hillfort and Motte (6.9 km), Ruperra Castle lower summerhouse remains (6.9 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Former Dam of Cwmcarn Canal Reservoir's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Former Dam of Cwmcarn Canal Reservoir stands on South Wales Upper Coal Measures Formation, bedrock that formed in the Westphalian. The rock here is mudstone, siltstone, sandstone, coal, ironstone and ferricrete.