The viaduct consists of five arches in yellow brick and stone and carries the railway across the London to Watford road.

This was expanded in 1875 and then replaced altogether in the 20th century with a steel bridge deck supported by brick and stone piers.

[1][2] The viaduct was illustrated by John Cooke Bourne in his series of lithographs on the London and Birmingham Railway, published in 1838.

[3] Beneath the main arch is a Second World War pillbox, once part of the Outer London Defence Ring, a series of obstacles and fortifications designed to hinder an invading army heading towards London.

[4] The viaduct was designated a Grade II listed building, a status which provides legal protection from unauthorised demolition or modification, in 1983.