Merrygill Viaduct is a Grade II listed building in the Westmorland and Furness local planning authority area, England. First listed on 21 May 1999. Viaduct.
Merrygill Viaduct
- WRENN ID
- idle-pavement-grain
- Grade
- II
- Local Planning Authority
- Westmorland and Furness
- Constituency
- Westmorland and Lonsdale MP: Tim Farron (LD)
- Country
- England
- Date first listed
- 21 May 1999
- Type
- Viaduct
- Address
- Merrygill Viaduct, Hartley
- OS grid reference
- NY 784 083
- Coordinates
- 54.47024, -2.33415
- Source
- Historic England listing
Description
Merrygill Viaduct is a railway viaduct built in 1861 for the South Durham and Lancashire Union Railway, designed by engineer Sir Thomas Bouch and constructed by contractors Chambers and Hilton. The viaduct is made of rock-faced limestone rubble and features nine spans, measuring 110 meters in length and reaching heights of up to 24 meters. It has a cornice and tall parapets. The South Durham and Lancashire Union Railway opened in 1863 and became part of the Stockton and Darlington Railway. This railway later merged with the North Eastern Railway in the same year. Initially a single track, the line was doubled in 1889. The viaduct was closed in 1965, and while many large metal viaducts were demolished, the four masonry viaducts, including Merrygill, remain.
Local climate
Merrygill Viaduct sits in one of the wettest parts of the UK, with an average of 1,190 mm of rain a year. This makes it wetter than 91% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 82% of listed buildings.
It experiences an average of 62 freeze-thaw cycles a year, more than 98% of listed buildings. Of these, 39 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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