Pont Cerwyn Dewi/Merryvale Bridge & attached Tower is a Grade II* listed building in the Pembrokeshire Coast National Park local planning authority area, Wales. First listed on 1 March 1963. Bridge.

Pont Cerwyn Dewi/Merryvale Bridge & attached Tower

WRENN ID
calm-rubblework-cobweb
Grade
II*
Local Planning Authority
Pembrokeshire Coast National Park
Constituency
Mid and South Pembrokeshire MP: Henry Tufnell (Lab)
Country
Wales
Date first listed
1 March 1963
Type
Bridge
OS grid reference
SM 749 253
Coordinates
51.88126, -5.27123
Source
Cadw listing

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

Description

Pont Cerwyn Dewi, also known as Merryvale Bridge, is a Grade II* listed medieval structure dating back to around 1835. It is a double road bridge that spans the River Alun and the leat leading to Felin Isaf. The southern section of the bridge features an older structure over the mill-leat, which includes a rough stone arch and a medieval stone tower that is part of the Close Wall, also built over the leat. The tower is constructed of rubble stone and appears to function as a sluice gate, featuring a square shape with a vent loop on each side and a rough stone barrel vault inside.

The northern river bridge has a cut-stone single arch and a rubble ramped parapet. It was likely rebuilt in 1834 or 1835 following floods that had destroyed the earlier bridge.

Local climate

Pont Cerwyn Dewi/Merryvale Bridge & attached Tower sits in a wetter-than-average part of the UK, with an average of 1,050 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 3 freeze-thaw cycles a year, fewer than 99% 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.

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Nearby listed buildings

  1. The Deanery including Garden Walls & Gate Grade II 109 m
  2. The Bishop's Palace Grade I 133 m
  3. Coach House to the Deanery Grade II 134 m
  4. Retaining Wall to Churchyard from Deanery Gate to Ford opposite Bishops Palace, including Front Wall Grade II 139 m
  5. Warehouse between Merrivale & No.2 Catherine Street Grade II 150 m
  6. Warehouse occupied by St David's Assemblies Grade II 154 m
  7. The Close Wall (formerly listed with Porth Y Twr) Grade II* 155 m
  8. 51 Goat Street Grade II 171 m
  9. Retaining Wall on SE.Side of River Alun, from Ford to Bridge by Cloister Hall Grade II 172 m
  10. Front & Side Garden Wall & Gatepiers to The Arch Deaconry Grade II 189 m