South Portal of Welwyn Tunnel 300 Metres North of Welwyn North Station is a Grade II listed building in the Welwyn Hatfield local planning authority area, England. First listed on 4 October 2000. Tunnel portal.
South Portal of Welwyn Tunnel 300 Metres North of Welwyn North Station
- WRENN ID
- crumbling-hearth-starling
- Grade
- II
- Local Planning Authority
- Welwyn Hatfield
- Constituency
- Welwyn Hatfield MP: Andrew Lewin (Lab)
- Country
- England
- Date first listed
- 4 October 2000
- Type
- Tunnel portal
- OS grid reference
- TL 247 157
- Coordinates
- 51.82605, -0.19094
- Source
- Historic England listing
Description
The south portal of Welwyn Tunnel, located 300 metres north of Welwyn North Station, is a railway tunnel portal built between 1849 and 1850 for the Great Northern Railway. It was engineered by William and Joseph Cubitt and constructed by Thomas Brassey. The portal is made of sandstone ashlar and features a semi-circular arch with a dressed keyed surround, a cornice, and a parapet. It has flanking towers that rise above the center and are capped in a similar style. This portal is part of a significant group with the nearby Welwyn North Station. The railway line was opened by the Great Northern Railway in 1850.
Local climate
South Portal of Welwyn Tunnel 300 Metres North of Welwyn North Station sits in a drier-than-average part of the UK, with an average of 720 mm of rain a year. This makes it drier than 85% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 81% of listed buildings.
It experiences an average of 32 freeze-thaw cycles a year, fewer than 58% of listed buildings. Of these, 15 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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