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Glanstony Aqueduct, Trimsaran is a post-medieval masonry structure built to convey water across the coalfield landscape of south Wales. Located near Trimsaran in Carmarthenshire, the aqueduct sits upon bedrock of the South Wales Lower Coal Measures Formation, comprising mudstone, siltstone and sandstone interbedded with coal seams and ironstone layers. This Westphalian-age geology reflects the area's industrial heritage as a significant coal-mining region.
The aqueduct represents the infrastructure developments of the industrial era, when reliable water supply became essential to support mining operations, manufacturing processes and growing communities. Its construction in local stone demonstrates practical engineering adapted to the industrial topography of south Wales, where extractive industries had already transformed the landscape above ground.
The monument is protected by Cadw, the Welsh heritage authority, under reference CM270, recognising its historical importance as part of the industrial archaeological record of the Trimsaran area. The aqueduct survives as physical evidence of the organised systems required to sustain the intensive industrial activity that characterised the south Wales coalfield during its period of greatest expansion and exploitation.
Glanstony Aqueduct, Trimsaran is a scheduled monument protected by Cadw under reference CM270. View the official record →
Glanstony Aqueduct, Trimsaran is a post-medieval masonry structure built to convey water across the coalfield landscape of south Wales. It is designated a Scheduled Ancient Monument by Cadw under reference CM270.
Glanstony Aqueduct, Trimsaran dates from the post medieval/modern period, and is classified as a aqueduct. It is one of over 32,000 scheduled monuments protected across the UK.
Glanstony Aqueduct, Trimsaran 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 CM270.
Several scheduled monuments lie within 10 km, including Spudder's Bridge (0.9 km), Dome Gunnery Trainer, Pembrey Airfield (2.5 km), Garreg Lwyd Enclosure 600m SE of Crosslane Cottages (3.3 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Glanstony Aqueduct, Trimsaran'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.
Glanstony Aqueduct, Trimsaran stands on Pennine Lower Coal Measures Formation And South Wales Lower Coal Measures Formation (Undifferentiated), bedrock that formed in the Westphalian. The rock here is mudstone, siltstone, sandstone, coal, ironstone and ferricrete.