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Tai Mawr Leat for Cyfarthfa Iron Works is a post-medieval and modern water conduit constructed to serve the industrial needs of Cyfarthfa Iron Works. The leat was engineered to convey water across the landscape, a critical resource for the large-scale iron-smelting operations that developed in Wales during the industrial period. Such leats were fundamental infrastructure for ironworks, providing the power and cooling water essential to blast furnaces and forges.
The monument sits upon bedrock of the Millstone Grit Group, a sequence of mudstone, siltstone and sandstone deposits laid down during the Namurian epoch of the Carboniferous Period. This geology, typical of South Wales industrial valleys, provided both the raw materials and the challenging topography that shaped industrial development in the region.
The leat remains an important physical record of the relationship between water management and heavy industry in Wales. Cyfarthfa Iron Works became one of the most significant industrial sites in Britain, and the survival of its water infrastructure demonstrates the scale and sophistication of engineering required to sustain such operations. The leat is protected by Cadw under reference GM479.
Tai Mawr Leat for Cyfarthfa Iron Works is a scheduled monument protected by Cadw under reference GM479. View the official record →
Tai Mawr Leat for Cyfarthfa Iron Works is a post-medieval and modern water conduit constructed to serve the industrial needs of Cyfarthfa Iron Works. It is designated a Scheduled Ancient Monument by Cadw under reference GM479.
Tai Mawr Leat for Cyfarthfa Iron Works dates from the post medieval/modern period, and is classified as a leat. It is one of over 32,000 scheduled monuments protected across the UK.
Tai Mawr Leat for Cyfarthfa Iron Works 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 GM479.
Several scheduled monuments lie within 10 km, including Carn Castell y Meibion ring cairn (4.2 km), Darren Fawr Round Cairns (4.9 km), Gadlys Ironworks (Remains of Blast Furnace) (5.5 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Tai Mawr Leat for Cyfarthfa Iron Works'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.
Tai Mawr Leat for Cyfarthfa Iron Works stands on Millstone Grit Group [See Also Migr], bedrock that formed in the Namurian. The rock here is mudstone, siltstone and sandstone.