|This article needs additional citations for verification. (February 2012)|
|Total length||565 (1,854 ft|
|Longest span||165 m (541 ft)|
|Construction cost||3,100,000 francs|
The Garabit Viaduct (Viaduc de Garabit in French) is a railway arch bridge spanning the River Truyère near Ruynes-en-Margeride (Fr), Cantal, France, in the mountainous Massif Central region. The bridge was constructed between 1882 and 1884 by Gustave Eiffel, with structural engineering by Maurice Koechlin, and was opened in 1885. It is 565 m (1,854 ft) in length and has a principal arch of 165 m (541 ft) span.
By the end of the 1870s Eiffel & Cie, the company formed by Gustave Eiffel in partnership with Theophile Seyrig, had an established position among the leading French engineering companies. Between 1875 and 1877 the company had built the Maria Pia Bridge over the Douro at Porto, and when it was proposed to construct a railway between Marvejols and Neussargues in the Cantal department the work of constructing a viaduct to cross the River Truyère was given to Eiffel without the usual process of competitive tendering at the recommendation of the engineers of the state Highways Department since the technical problems involved were similar to those of the Maria Pia Bridge; indeed, it was Eiffel & Cie's success with this project that had led to the proposal for a viaduct at Garabit.
Bridge design and construction
When it opened with a single track in November 1885, the Garabit Viaduct was 565 m (1,854 ft) long and weighed 3,587 tonnes (3,530 long tons; 3,954 short tons). Even more impressive was the actual deflection, which was measured at 8 millimetres (0.315 in), a figure precisely anticipated by Eiffel’s calculations. The bridge was also, when built, the highest in the world at 124 m (407 ft) above the river. The overall project cost was 3,100,000 francs. Until 11 September 2009, only one regular passenger train per day in each direction used to pass over the viaduct - a Corail route from Clermont-Ferrand to Béziers. On that date, the viaduct was closed as cracks were discovered in one of the foundation piles.
Garabit Viaduct in fiction
The Garabit Viaduct was used to represent the condemned "Cassandra Crossing" bridge in the 1976 film The Cassandra Crossing. In the film the Cassandra Crossing has been unused and derelict for 30 or 40 years and is considered dangerous, to the extent that people living nearby moved away fearing it could collapse.
- Billington, David P. The Tower and the Bridge: The New Art of Structural Engineering. Princeton, New Jersey: Princeton University Press, 1983. ISBN 978-0-691-02393-9.
- Harvie, David I. Eiffel: The Genius Who Reinvented Himself. Stroud, Gloucestershire: Sutton, 2006 ISBN 0-7509-3309-7
- Loyrette, Henri. Gustave Eiffel. New York: Rizzoli,1985 ISBN 0-8478-0631-6
- Garabit Viaduct at Structurae
- Garabit Viaduct on bridge-info.org
- PBS Building Big series databank entry for Garabit Viaduct
- The Cassandra Crossing at the Internet Movie Database