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Irthlingborough Viaduct

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Irthlingborough Viaduct
Location Map ( geo)
Irthlingborough Viaduct - Geograph - 90947.jpg
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South East of Irthingborough
Highway Authority
North Northamptonshire
Opening Date
On road(s)
Crossings related to the A6

Irthlingborough Viaduct crosses the River Nene on the A6 to the east of Irthlingborough.


The 31 span concrete viaduct over the River Nene and railway was opened on 23 October 1936 by Leslie Hore-Belisha, Minister of Transport. It formed a southern extension of Irthlingborough Bypass (opened 1932) and bypassed the railway level crossing.


Length was 1,360 feet and width between parapets 40 feet. Height varied between 20 and 33 feet. The 31 spans were not of equal length, varying between about 33 feet and 44 feet and were carried on reinforced concrete trestles each containing 5 columns. Foundations were taken down to gravel level at between 6 and 13 feet depth. A 7.5 inch reinforced concrete slab spanned the beams and carried the concrete filling and 3.5 inches of tarmacadam for the road surface. The gradient of the bridge was 1 in 30. 20,000 cubic yards of filling were required for the approach embankments.

Light coloured local dry pit sand was used with Portland Cement and Triscosal as a surface finish on concrete. This gave a resemblance to a stone built structure. Over 600 tons of steel and 7,200 cubic yards of concrete was used in construction. Ten expansion joints were provided at roughly 150 feet intervals.

Architect was J.A. Gitch with Consulting engineer for the reinforced concrete work being Mr Vawdrey of the Indented Bar and Concrete Engineering Co. Ltd. of London. Bridge contractor was A.E. Farr of London with the rest of the scheme being completed by Council direct labour. Estimated cost was £55,750, of which 75% was paid by Ministry of Transport.

Irthlingborough Viaduct
Related Pictures
View gallery (2)
Irthlingborough Viaduct - Geograph - 90947.jpgIrthlingborough Viaduct crossing the River Nene - Geograph - 7333466.jpg
Crossings of the River Nene
Badby Bridge • M1 Viaduct, near Junction 16 • Upton Way Bridge • Towcester Road Bridge • South Bridge (Northampton) • Northampton South Bypass Bridge • Bedford Road Bridge • Wellingborough Bypass Bridge • London Road Bridge (Wellingborough) • Irthlingborough Viaduct • Nene Viaduct • Oundle Bypass South Bridge • Oundle Bypass North Bridge • North Bridge (Oundle) • Wansford Bridge • Wansford Bypass Bridge • Nene Parkway Bridge • Town Bridge • Black Bridge • Dog-in-a-Doublet Bridge • Guyhirn Bridge • Freedom Bridge • Cross Keys Bridge

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