Pueyrredon Bridge
The Pueyrredón Bridge (officially called Puente Prilidiano Pueyrredón) is a bascule bridge in Buenos Aires, Argentina. It connects Vieytes street in the Barracas area with Bartolomé Mitre Avenue in Avellaneda Partido, crossing over Matanza River (popularly known as Riachuelo)
Prilidiano Pueyrredón designed an iron bridge with a double-leaf bascule mechanism. The government approved the project and granted a concession to Pueyrredón and his partners Mr. Medrano, Mr. Panthou and Mr. Escribano. The bridge was finished in 1867. The mechanism failed and the bridge collapsed on its opening day. The partners signed a new contract committing to build a new bridge, to be inaugurated in November 1871. As a result of the disaster, Pueyrredón suffered from financial problems and died in 1870. In memory of Pueyrredón, the Government gave his name to the bridge, finally inaugurated in 1871.
This Pueyrredón bridge lasted only 13 years, being destroyed by the Riachuelo flood on September 23, 1884. It was quickly replaced by a wooden bridge. Photographs suggest that this was a swing bridge.
In 1899 a new iron bascule bridge was built, and opened in 1903. Because of the increasing traffic of carriages and trams, the construction of a new and bigger bridge was considered necessary by the Government. This third bridge operated until 1931.
On 30 September 1931, a fourth bridge (also bascule) was inaugurated after the previous one was dismantled.
The bascule mechanism has been disused since 1969, when the New Pueyrredón Bridge was inaugurated.
In January 2009 the Pueyrredón bridge was closed for refurbishment.
The above information is largely condensed from the Wikipedia entry.
See here[1] for an assessment of the condition and refurbishment of the 1931 bridge, including illustrations of the structure and mechanism.