Tanybont Arch, including former lock-up to SE is a Grade II* listed building in the Gwynedd local planning authority area, Wales. First listed on 10 August 1953. A C14 Bridge.
Tanybont Arch, including former lock-up to SE
- WRENN ID
- strange-ember-twilight
- Grade
- II*
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 10 August 1953
- Type
- Bridge
- Address
- Tanybont Arch, including former lock-up to SE, Caernarfon
- OS grid reference
- SH 479 628
- Coordinates
- 53.14081, -4.27525
- Source
- Cadw listing
Description
Tanybont Arch is a historic structure featuring a single surviving span made of coursed limestone with a segmental arch, located next to the East Gate to the west. The original bridge has been widened on the south side by the addition of a segmental pointed arch constructed from random rubble, which connects to the south drum tower. On the north side, it has been widened by a lower segmental arch made of coursed stone, which connects to the north drum tower. Behind this widening, the original structure flares out, showing signs of partial stone removal. The remaining part of the 14th-century bridge is hidden beneath Eastgate Street. On the southeast side, beneath 4 Eastgate Street, there is a 19th-century former lock-up, now serving as an Eastern Orthodox Chapel, which is attached to the south side of the bridge. This lock-up features a pointed door on the left and a window on the right.
Local climate
Tanybont Arch, including former lock-up to SE sits in one of the wettest parts of the UK, with an average of 1,370 mm of rain a year. This makes it wetter than 97% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 98% of listed buildings.
It experiences an average of 20 freeze-thaw cycles a year, fewer than 78% of listed buildings. Of these, 9 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
- No sale records on file
- No related consent applications matched
- 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
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