Iron Road Bridge Over the New River is a Grade II listed building in the East Hertfordshire local planning authority area, England. Bridge.

Iron Road Bridge Over the New River

WRENN ID
rusted-outpost-sparrow
Grade
II
Local Planning Authority
East Hertfordshire
Constituency
Broxbourne MP: Lewis Cocking (Con)
Country
England
Type
Bridge
Address
Iron Road Bridge Over the New River, Lower Road, Great Amwell
OS grid reference
TL 365 131
Coordinates
51.80014, -0.02065
Source
Historic England listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

The Iron Road Bridge over The New River is a road bridge dating from 1824. It is constructed of cast iron and features a wrought iron balustrade. The bridge has segmental arched iron girders on each face, with open spandrels that include two circles. There is a raised band and a central 'keystone' that displays the date. Additionally, raised lettering on the girder reads: 'New River Company: Priestfield's Iron Works near Bilston.' This bridge is noted as the earliest remaining bridge along The New River in Hertfordshire and was built while William Chadwell Mylne, who lived from 1781 to 1863, served as the company's engineer.

Local climate

Iron Road Bridge Over the New River sits in a drier-than-average part of the UK, with an average of 700 mm of rain a year. This makes it drier than 90% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 88% of listed buildings.

It experiences an average of 34 freeze-thaw cycles a year, fewer than 52% of listed buildings. Of these, 16 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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  8. Milestone at Tl 3627 1350 (Outside Boundary Wall of Number 132, Not Included) Grade II 472 m
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