Haroldstone Bridge (partly in Merlins Bridge community) is a Grade II listed building in the Pembrokeshire local planning authority area, Wales. First listed on 1 July 1974. Vernacular house.

Haroldstone Bridge (partly in Merlins Bridge community)

WRENN ID
long-railing-candle
Grade
II
Local Planning Authority
Pembrokeshire
Constituency
Mid and South Pembrokeshire MP: Henry Tufnell (Lab)
Country
Wales
Date first listed
1 July 1974
Type
Vernacular house
Address
Haroldstone Bridge (partly in Merlins Bridge community), Haverfordwest
OS grid reference
SM 959 148
Coordinates
51.79485, -4.96112
Source
Cadw listing

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

Description

Haroldstone Bridge is a single-arched road bridge featuring a well-hade segmental arch made of rock-faced stone voussoirs. It has a raised grey limestone flat band above the arch. The bridge is notable for its unusually high flat parapets, which have squared end-on coping stones. There is a boundary stone with an eroded inscription built into the west parapet. The parapets are ramped down at the ends on the southeast, southwest, and northeast sides.

Local climate

Haroldstone Bridge (partly in Merlins Bridge community) sits in a wetter-than-average part of the UK, with an average of 1,060 mm of rain a year. This makes it wetter than 85% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 96% of listed buildings.

It experiences an average of 4 freeze-thaw cycles a year, fewer than 98% of listed buildings. Of these, 1 follows 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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  • Detailed attributes — period, style, materials, features
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  • 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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