Castle Remains at Harbour Mouth is a Grade II* listed building in the Cornwall local planning authority area, England. First listed on 13 March 1951. Castle remains.
Castle Remains at Harbour Mouth
- WRENN ID
- pitched-ledge-auburn
- Grade
- II*
- Local Planning Authority
- Cornwall
- Constituency
- St Austell and Newquay MP: Noah Law (Lab)
- Country
- England
- Date first listed
- 13 March 1951
- Type
- Castle remains
- Address
- Castle Remains at Harbour Mouth, Fowey
- OS grid reference
- SX 121 513
- Coordinates
- 50.33191, -4.64047
- Source
- Historic England listing
Description
The remains of a castle located at the mouth of the river in Fowey date back to the late 15th century. This blockhouse was constructed following the French attack that resulted in the burning of the town in 1457. There is a similar structure on the opposite side of the river, and a chain was once slung between the two for defense. The small square tower is made of stone rubble and is now in ruins, appearing decayed on a chart of defenses from the reign of Henry VIII.
Local climate
Castle Remains at Harbour Mouth sits in a wetter-than-average part of the UK, with an average of 1,030 mm of rain a year. This makes it wetter than 83% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 91% of listed buildings.
It experiences an average of 9 freeze-thaw cycles a year, fewer than 92% 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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- 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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