Pentrefelin (Afon Eglwyseg) Aquaduct is a Grade II listed building in the Denbighshire local planning authority area, Wales. First listed on 22 April 1998. Aqueduct. 3 related planning applications.
Pentrefelin (Afon Eglwyseg) Aquaduct
- WRENN ID
- drifting-chapel-barley
- Grade
- II
- Local Planning Authority
- Denbighshire
- Constituency
- Clwyd East MP: Becky Gittins (Lab)
- Country
- Wales
- Date first listed
- 22 April 1998
- Type
- Aqueduct
- Address
- Pentrefelin (Afon Eglwyseg) Aquaduct, Llangollen, Llantysilio, LL20 8EE
- OS grid reference
- SJ 205 436
- Coordinates
- 52.98414, -3.18432
- Source
- Cadw listing
Description
The Pentrefelin Aqueduct, built over a raised embankment, features rubble stonework and includes a short semi-circular tunnel that allows the River Eglwyseg to flow through to join the River Dee to the south. The tunnel is constructed with flush regular ashlar voussoirs, highlighted by a prominent keystone that rises to a horizontal string course. Above this, the faced stonework extends approximately 2 meters to the level of the canal towpath, where another square string course serves as the base for the orthostatic parapet along the towpath. The embankment is curved in plan, flanked by slight end pilasters, and continues for an additional 35 meters on either side before tapering into the embankment. The northern face of the aqueduct and the cut for the canal were rebuilt around 1990.
Local climate
Pentrefelin (Afon Eglwyseg) Aquaduct receives an average of 920 mm of rain a year. This makes it wetter than 70% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 73% of listed buildings.
It experiences an average of 48 freeze-thaw cycles a year, more than 89% of listed buildings. Of these, 28 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.
More on this building
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- No EPC on record for this property
- Sale history — 3 transactions since 2001
- Related listed building consents — 3 applications
- Detailed attributes — period, style, materials, features
- Flood risk assessment
- Radon risk assessment
- Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
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