History in Structure

This site is entirely user-supported. See how you can help.

Aqueduct SE of Church of St Cynllo

A Grade II Listed Building in Nantmel, Powys

We don't have any photos of this building yet. Why don't you be the first to send us one?

Upload Photo »

Approximate Location Map
Large Map »


Latitude: 52.286 / 52°17'9"N

Longitude: -3.4159 / 3°24'57"W

OS Eastings: 303511

OS Northings: 266263

OS Grid: SO035662

Mapcode National: GBR 9N.Y1NB

Mapcode Global: VH696.QSZX

Entry Name: Aqueduct SE of Church of St Cynllo

Listing Date: 28 February 2005

Last Amended: 28 February 2005

Grade: II

Source: Cadw

Source ID: 84101

Location: In a field SE of the churchyard, spanning a steep-sided dingle.

County: Powys

Community: Nantmel

Community: Nantmel

Traditional County: Radnorshire

Find accommodation in


Part of the Birmingham Corporation scheme to supply water to the city from reservoirs in the Elan Valley. The project began in 1892 with the construction of the reservoirs and opened in 1904. Chief engineer was James Mansergh, joined and later succeeded as project engineers by his sons Ernest Lawson Mansergh and Walter Leahy Mansergh. The water was conveyed principally by means of a subterranean aqueduct, but where the ground level fell below the hydraulic gradient one of the solutions (as used here) was to build an aqueduct above ground.


An 8-span aqueduct carrying a steel conduit across a steep-sided brook. Of coursed rock-faced stone with freestone dressings and quoins. Segmental arches of 20-foot (6.1m) span have prominent keystones. Tapering piers are continued up to the coped parapet as freestone panelled pilasters. A thick band is beneath the parapet. Original iron railings and gates are at the ends. The conduit is buried beneath gravel within the trough of the aqueduct.

Reasons for Listing

Listed for its special architectural and historic interest as a well-detailed aqueduct of definite quality and character in a prominent location, and as an integral component of one of the foremost civil engineering projects of the early C20 in Wales.

Other nearby listed buildings

BritishListedBuildings.co.uk is an independent online resource and is not associated with any government department. All government data published here is used under licence. Please do not contact BritishListedBuildings.co.uk for any queries related to any individual listed building, planning permission related to listed buildings or the listing process itself.

British Listed Buildings is a Good Stuff website.