New River Head Chimney Conduit (Devil's Conduit) in the Round Reservoir is a Grade II listed building in the Islington local planning authority area, England. Chimney conduit.

New River Head Chimney Conduit (Devil's Conduit) in the Round Reservoir

WRENN ID
other-remnant-wren
Grade
II
Local Planning Authority
Islington
Constituency
Islington South and Finsbury MP: Emily Thornberry (Lab)
Country
England
Type
Chimney conduit
Address
New River Head Chimney Conduit (Devil's Conduit) in the Round Reservoir, Rosebery Avenue
OS grid reference
TQ 313 827
Coordinates
51.52872, -0.10785
Source
Historic England listing

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

Description

The New River Head Chimney Conduit, also known as the Devil's Conduit, is a chimney conduit located within the former Round Pond at the rear of the New River Head Office Building in Islington. It dates back to the 14th century, with later additions, and was originally situated in Queen's Square, Bloomsbury. It was dismantled and re-erected at New River Head in 1927. The structure is made of rusticated Portland stone ashlar with plain stone dressings. It features a flat stone roof on the upper chamber and a vaulted pebble-dash roof on the lower chamber, showcasing a symmetrical design. The conduit is set on a splayed plinth with a raised entrance to the upper chamber. Originally, this conduit served as an extension to the White Conduit, which supplied water to the Grey Friar's Monastery, later known as Christ's Hospital in Queen's Square.

Local climate

New River Head Chimney Conduit (Devil's Conduit) in the Round Reservoir sits in one of the driest parts of the UK, with an average of 690 mm of rain a year. This makes it drier than 95% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 98% of listed buildings.

It experiences an average of 35 freeze-thaw cycles a year, more than 57% 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.

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