Millbank, Cassell's large scale map of London, 1867.
(to the editor: why is Lambeth bridge on the map in 1867 when it wasn't built until 1932?)
Probably for this reason: "The previous structure was a suspension bridge, 828 feet (252.4 m) long, designed by Peter W. Barlow. Sanctioned by an Act of Parliament in 1860, it opened as a toll bridge in 1862 but doubts about its safety, coupled with its awkwardly steep approaches deterring horse-drawn traffic, meant it soon became used almost solely as a pedestrian crossing."