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Pentrefelin (Afon Eglwyseg) Aquaduct

A Grade II Listed Building in Llantysilio, Denbighshire

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Latitude: 52.9841 / 52°59'2"N

Longitude: -3.1843 / 3°11'3"W

OS Eastings: 320587

OS Northings: 343633

OS Grid: SJ205436

Mapcode National: GBR 6Y.J105

Mapcode Global: WH784.18Y4

Entry Name: Pentrefelin (Afon Eglwyseg) Aquaduct

Listing Date: 22 April 1998

Last Amended: 22 April 1998

Grade: II

Source: Cadw

Source ID: 19683

Building Class: Transport

Location: Located in Pentrefelin, near the junction of the A542 with the B5013, NNW of Llangollen.

County: Denbighshire

Town: Llangollen

Community: Llantysilio

Community: Llantysilio

Locality: Pentrefelin

Traditional County: Denbighshire

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The 6 mile (3.73 km) long Llangollen canal had been proposed as feeder to the main Ellesmere Canal that was to link the Rivers Mersey and Dee with the River Severn. The Act was passed in 1793 and this section was constructed under the direction of Thomas Telford: work on the extension to Llantysilio was begun in 1804 and completed in 1808. The canal also provided transport to the slate quarries and limestone works. In 1846 it became part of the Shropshire Union Railways and Canal Company but the following year was taken over by the LNWR. Transport on the canal diminished in later C19 with the arrival of the railways and then ceased by 2nd World War. The canal was only kept open because of its importance as a supplier of water.


Built-up embankment faced with rubble stonework, above a short semi-circular tunnel for the River Eglwyseg to pass through to join the River Dee immediately to the S. The tunnel is faced with flush regular ashlar voussoirs with a pronounced keystone rising to a horizontal string course. Above this the faced stonework rises some 2m to the level of the canal towpath, where another square string forms the base to the orthostatic parapet to the towpath. The faced embankment is curved on plan between slight end pilasters, and continues for a further 35m each side to die away into the embankment. The cut for the canal, and the N face of the aquaduct was rebuilt in c1990.

Reasons for Listing

Included as an important canal structure on the Llangollen Branch of the Ellesmere Canal, and one of a group of such structures.

Other nearby listed buildings

  • II Pentrefelin Tramway Viaduct
    The viaduct crosses the valley of the River Eglwyseg immediately NE of the junction of the A542 and the B5103 at Pentrefelin.
  • II Pentrefelin House
    The house stands above the canal and River Dee, at the junction of the Horseshoe Pass road with the B5103 Rhewl Road.
  • II Pentrefelin Bridge, Llangollen Canal Bridge No 48
    The bridge spans the Llangollen Canal N of Llangollen and immediately E of Pentrefelin, at the foot of the Horseshoe Pass, carrying the road to the Pentrefelin works which are immediately to W.
  • II Henllys
    High above the modern A5, to NW of the town reached from a lane that was in the early C19 the main Holyhead Road. On levelled site with broad views to NE.
  • II Ty Craig Canal Bridge
    The bridge, No 48A in the series, spans the Llangollen Canal approximately 200m E of the Chain Bridge Hotel
  • II Cottage at Valle Crucis Abbey
    The building is set between the abbey ruins and the river, south of the abbey fishponds.
  • I Valle Crucis Abbey
    The abbey lies in the lower Eglwyseg valley between the main road and the river, approximately 0.9km N of Llangollen.
  • II Well House at Abbey Farm
    The well house is built into the embankment of the road by Abbey Farm, facing the lane leading to Valle Crucis.

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