Bridge at SW 786 400 SE is a Grade II listed building in the Cornwall local planning authority area, England. First listed on 12 March 1986. Bridge.

Bridge at SW 786 400 SE

WRENN ID
broken-bronze-heath
Grade
II
Local Planning Authority
Cornwall
Constituency
Truro and Falmouth MP: Jayne Kirkham (Lab)
Country
England
Date first listed
12 March 1986
Type
Bridge
Address
Bridge at SW 786 400 SE, Perranarworthal
OS grid reference
SW 786 400
Coordinates
50.21865, -5.10381
Source
Historic England listing

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

Description

The bridge over the Carnon River, built around the early 19th century, is constructed from killas rubble with granite lintels and dressed granite hogs-back copings. It features five spans with lintels that span flat arches between slender piers, which have cutwaters on both the upstream and downstream sides. The bridge has plain parapets topped with its original copings. Although it now serves a minor road, it was once the main route from Truro to Penryn and Falmouth, facilitating access across a significant mining valley in Cornwall during the early 19th century. This structure represents a late example of the simple post and lintel design. The Carnon River is no longer navigable at this location.

Local climate

Bridge at SW 786 400 SE receives an average of 850 mm of rain a year. This makes it wetter than 59% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 84% of listed buildings.

It experiences an average of 7 freeze-thaw cycles a year, fewer than 95% of listed buildings. Of these, 3 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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