South Portal to the Tavistock Canal Tunnel at Ngr 448 702 is a Grade II listed building in the West Devon local planning authority area, England. First listed on 23 January 1987. Canal tunnel portal.
South Portal to the Tavistock Canal Tunnel at Ngr 448 702
- WRENN ID
- far-keep-fog
- Grade
- II
- Local Planning Authority
- West Devon
- Constituency
- Torridge and Tavistock MP: Sir Geoffrey Cox (Con)
- Country
- England
- Date first listed
- 23 January 1987
- Type
- Canal tunnel portal
- Address
- South Portal to the Tavistock Canal Tunnel at Ngr 448 702, Gulworthy
- OS grid reference
- SX 448 702
- Coordinates
- 50.51181, -4.18897
- Source
- Historic England listing
Description
The south portal to the Tavistock Canal tunnel, dated 1803, is located in Morwellham. The Tavistock Canal was constructed between 1803 and 1817 by John Taylor and spans 4½ miles, connecting the River Tavy to the River Tamar. For nearly 2 miles, the canal runs through a tunnel beneath Morwell Down. From the south portal, it links to Morwellham via an incline plane with a drop of 237 feet. The structure is made of coursed granite rubble and features a round-headed archway with voussoirs and a keystone, along with a datestone positioned above and flanking walls.
Local climate
South Portal to the Tavistock Canal Tunnel at Ngr 448 702 sits in a wetter-than-average part of the UK, with an average of 1,000 mm of rain a year. This makes it wetter than 80% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 81% of listed buildings.
It experiences an average of 17 freeze-thaw cycles a year, fewer than 84% of listed buildings. Of these, 7 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.
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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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