Ancient Monuments

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Tai Mawr Leat for Cyfarthfa Iron Works

A Scheduled Monument in Vaynor (Y Faenor), Merthyr Tydfil (Merthyr Tudful)

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Latitude: 51.7575 / 51°45'26"N

Longitude: -3.4018 / 3°24'6"W

OS Eastings: 303342

OS Northings: 207460

OS Grid: SO033074

Mapcode National: GBR HM.0K1L

Mapcode Global: VH6CX.Z3G1

Entry Name: Tai Mawr Leat for Cyfarthfa Iron Works

Scheduled Date: 7 April 1995

Source: Cadw

Source ID: 3123

Cadw Legacy ID: GM479

Schedule Class: Industrial

Category: Leat

Period: Post Medieval/Modern

County: Merthyr Tydfil (Merthyr Tudful)

Community: Vaynor (Y Faenor)

Built-Up Area: Merthyr Tydfil

Traditional County: Glamorgan


The monument consists of a leat, an artificial water channel usually leading to a mill, probably dating to 18th century. The leat was constructed in 1766 as the original watercourse to serve Cyfartha ironworks. It is recorded in the diaries of Charles Wood, the agent of Anthony Bacon, in construction of the ironworks. The leat was originally designed by William Edwards and revised by Wood to reach a higher point on the Taff. A cast iron sluice besides a stone weir topped with cast iron plates opens into a channel, which continues beside the river. Part of the leat has been cut into the bedrock, and the remainder was walled and buttressed in stone. The monument is of national importance for its potential to enhance our knowledge of 18th or 19th century industrial practices. It retains significant archaeological potential, with a strong probability of the presence of associated archaeological features and deposits. The structure itself may be expected to contain archaeological information concerning chronology and building techniques. A leat may be part of a larger cluster of monuments and their importance can further enhanced by their group value. The scheduled area comprises the remains described and areas around them within which related evidence may be expected to survive.

Source: Cadw

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