Lledan Brook Aqueduct and Weir is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 11 March 1981. Aqueduct.
Lledan Brook Aqueduct and Weir
- WRENN ID
- last-plinth-sage
- Grade
- II
- Local Planning Authority
- Powys
- Constituency
- Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
- Country
- Wales
- Date first listed
- 11 March 1981
- Type
- Aqueduct
- Address
- Lledan Brook Aqueduct and Weir, Welshpool
- OS grid reference
- SJ 227 074
- Coordinates
- 52.65925, -3.14422
- Source
- Cadw listing
Description
The Lledan Brook Aqueduct and Weir is a notable structure associated with the Montgomeryshire Canal, which was built between 1794 and 1797. The original aqueduct at this location was replaced in 1836 by J.A.S. Sword, the canal company's engineer since 1833. Its design was inspired by an earlier aqueduct constructed by George Buck at Brithdir in 1819.
The aqueduct features a base and sides made from a series of bolted cast-iron plates, with paths supported by brick arches. These arches are designed with conventional segmental shapes and rusticated stone voussoirs. Above the western arch, there is an inscribed tablet that reads 'J. Sword, Engineer, 1836'. The tow-path side is topped with cast-iron railings that have a trellised decoration, set between panelled ashlar terminal piers that have domed caps.
On the western side of the aqueduct, brick retaining walls line both banks of the brook, framing a pool beneath a circular weir. This weir was likely rebuilt alongside the aqueduct in 1836 and was used to divert water to the Domen cornmill.
The aqueduct is an excellent example of the engineering related to the Montgomeryshire Canal, showcasing both its engineering significance and architectural character. Together with the weir, it is an important part of a group of structures located at the major canal wharf in Welshpool.
Local climate
Lledan Brook Aqueduct and Weir receives an average of 840 mm of rain a year. This makes it wetter than 55% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 61% of listed buildings.
It experiences an average of 42 freeze-thaw cycles a year, more than 80% of listed buildings. Of these, 21 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.
Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.
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