The Helmdon viaduct was built in the last decade of the nineteenth century. The Great Central opened for coal traffic in 1898 and on the 15 March 1899 for passenger traffic. During its construction and that of the railway line, a large camp to house the navvies was built nearby.

"The Helmdon valley is crossed by two banks and a viaduct of nine arches, each of 34ft 3in span and of the same general design as those at Catesby and Brackley. The treacherous nature of the clay foundations necessitated the distance between the piers being bricked in with five rings of brindle brickwork in cement".
From Fielden's Magazine, Vol. 2, 1900.

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