Holborn Viaduct

Holborn Viaduct is a road bridge in London and the name of the street which crosses it (which forms part of the A40 route). It links Holborn, via Holborn Circus, with Newgate Street, in the City of London financial district, passing over Farringdon Street and the subterranean River Fleet. The viaduct spans the steep-sided Holborn Hill and the River Fleet valley at a length of 1,400 feet (430 m) and 80 feet (24 m) wide. City surveyor William Haywood was the architect and the engineer was Rowland Mason Ordish.

It was built between 1863 and 1869, as a part of the Holborn Valley Improvements, which included a public works scheme which, at a cost of over £2 million (over £167 million in 2015), improved access into the City from the West End, with better traffic flow and distribution around the new Holborn Circus, the creation of Queen Victoria Street, the rebuilding of Blackfriars Bridge, the opening of the Embankment section into the City, the continuation of Farringdon Street as Farringdon Road and associated railway routes with Farringdon station and Ludgate Hill station. It was opened by Queen Victoria at the same time as the inauguration of the other thoroughfares with a formal coach drive procession.

The viaduct effected a more level approach on the crossing of this section of the Holborn/Fleet valley from east to west, across Farringdon Street. Previously this involved horse-drawn traffic having to descend from High Holborn along Charterhouse Street to the smaller Holborn Bridge, crossing the River Fleet which had been culverted between Ludgate Circus to this crossing in 1734 to ascend to the other side using Snow Hill; it was one of the first modern flyovers in central London.

...
Wikipedia