Telford Milestone (18) is a Grade II listed building in the Isle of Anglesey local planning authority area, Wales. First listed on 20 October 1998. Milestone.

Telford Milestone (18)

WRENN ID
crumbling-plaster-coral
Grade
II
Local Planning Authority
Isle of Anglesey
Constituency
Ynys Môn MP: Llinos Medi (PC)
Country
Wales
Date first listed
20 October 1998
Type
Milestone
Address
Telford Milestone (18), Gaerwen, Llanfihangel Ysgeifiog
OS grid reference
SH 494 718
Coordinates
53.22243, -4.25616
Source
Cadw listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

The Telford Milestone is made of dressed Anglesey limestone and dates from the 19th century. It features a shallow triangular head with raking chamfered sides. There is a cast iron inset plate with white lettering on a black background that reads: HOLYHEAD / 18 / MONA / 5 / BANGOR / 7.

The milestone is set in front of a rubble arch that is part of a boundary wall. This arch is a well-preserved example of a “Telford Arch,” which is believed to have been designed to enhance and draw attention to the milestone.

Local climate

Telford Milestone (18) sits in one of the wettest parts of the UK, with an average of 1,190 mm of rain a year. This makes it wetter than 91% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 95% of listed buildings.

It experiences an average of 16 freeze-thaw cycles a year, fewer than 84% of listed buildings. Of these, 6 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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