Bridge 52, Calder Aqueduct and weir, Lancaster Canal is a Grade II listed building in the Wyre local planning authority area, England. First listed on 20 April 2015. Aqueduct.
Bridge 52, Calder Aqueduct and weir, Lancaster Canal
- WRENN ID
- strange-granite-dawn
- Grade
- II
- Local Planning Authority
- Wyre
- Constituency
- Lancaster and Wyre MP: Cat Smith (Lab)
- Country
- England
- Date first listed
- 20 April 2015
- Type
- Aqueduct
- OS grid reference
- SD 506 433
- Coordinates
- 53.8843, -2.75169
- Source
- Historic England listing
Description
Bridge 52 is an aqueduct that carries the Lancaster Canal over the River Calder, along with a weir on the river. It was built in 1797 when the canal opened, designed by engineer John Rennie. The structure is made of sandstone, with later alterations in concrete.
The aqueduct supports the canal and towpath above the river and features rock-faced sandstone below the parapets. Both the upstream and downstream faces of the aqueduct are curved to enhance its strength. The western parapet is made of large sandstone blocks set on edge, two courses high. The eastern parapet, which is set back about 5 meters from the canal's edge, is constructed of coursed dressed sandstone and curves around upstream on both sides of the river. Parts of the eastern parapet have been partially rebuilt in concrete. Upstream of the aqueduct, there is a weir that is built continuously with the aqueduct. This weir consists of large sandstone blocks shaped with a rounded profile along its crest and stands approximately 1.5 meters high. It was designed to lower the riverbed beneath the canal. The river flows under the canal through a single elliptical arch.
Local climate
Bridge 52, Calder Aqueduct and weir, Lancaster Canal sits in one of the wettest parts of the UK, with an average of 1,350 mm of rain a year. This makes it wetter than 96% 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 26 freeze-thaw cycles a year, fewer than 72% of listed buildings. Of these, 11 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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