Bridges presentation
replaced in iron, and later in steel. One of the first iron viaducts was the 1673ft (510m) long Crumlin
Viaduct (1857), constructed by Thomas W Kennard and designed by Charles Liddell for the
Newport-Hereford line, 217ft (66m) above the Ebbw Vale in Wales (UK). It served as the prototype
for later ones, such as the Viaduc de la Bouble (1871), a series of lattice girders on cast-iron towers
flared at the bottom, built under the direction of Wilhelm Nordling. It was 1296ft (395m) long by
216ft (66m) high on the Commentry-Gannett line in France.
Figure 15 Kinzua Viaduct (1900), located on the Bradford Branch
in a remote region near the town of Kushequa in north-west
Figure 14 Portage Viaduct (1852) (USA),
Pennsylvania (USA), was originally constriucted in 1882 by the
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