Chalfont Viaduct

Chalfont Viaduct
Give Peas A Chance - - 1723109.jpg
Chalfont Viaduct seen from the M25 (in 2009)
Coordinates51°34′56″N 0°32′04″W / 51°34′56″N 0°32′04″W / 51.5823; -0.5345
DesignerJames Charles Inglis, R.C. Sikes
Construction start1902
Construction end1906
Chalfont Viaduct is located in Buckinghamshire
Chalfont Viaduct
Chalfont Viaduct
Location of the Chalfont Viaduct in Buckinghamshire

The Chalfont Viaduct (also known as the Misbourne Viaduct) is the first of two five-arch brick railway viaducts on the Chiltern Main Line in south-east England. It is located between Gerrards Cross and Denham Golf Club stations. The M25 motorway passes beneath it between junctions 16 and 17 at Gerrards Cross near Chalfont St Peter, from where the bridge gets its name. The bridge is known as Chalfont No. 1 Viaduct; the longer Chalfont No. 2 Viaduct is a short distance to the west and spans the A413.[1]

The bridge is noted as a local landmark because for more than 20 years it bore a graffiti slogan, "give peas a chance" painted in large white letters on the south-facing parapet.[2][3]


The River Misbourne diverted via culverts under the M25

The Chalfont Viaduct is built of blue and black engineering brick with additional decorative brickwork. The bridge is approximately 12.5 metres (41 ft) high, although it varies in height due to changing ground level, and it has five semi-elliptical arches, each 15.5 metres (51 ft) wide. It was constructed between 1902 and 1906 by the Great Western Railway (GWR) to carry trains on the Great Western and Great Central Joint Railway between London and High Wycombe across the River Misbourne.[4][5] It was designed by James Charles Inglis, chief civil engineer of the GWR, and assistant engineer Robert Cherry Sikes.[6]

In the mid-1980s the construction of the M25 motorway required the Misbourne to be diverted via underground concrete culverts. The route of the motorway was aligned to pass through the arches of the Chalfont Viaduct, leaving the viaduct largely unaltered apart from the raised ground level and the addition of concrete supports and crash barriers. The viaduct is the only brick-built bridge on this section of the M25.[5]

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