Bridges presentation
world's great arch bridges, the 541ft (165m) Garabit Viaduct (1885) in the windy valleys of the
Massif Central, though he held to wrought iron, not being convinced of the efficacy of the new
material.
Steel arches of enormous span were built during the first few decades of the 20th century. One of the
greatest is the Hell Gate Bridge in the USA (1917), a two-hinged trussed arch, the top chord of
which serves as part of a stiffening truss. Designed by Gustav Lindenthal to span the Hell Gate at
the northern tip of Manhattan Island for the New England Connecting Railroad, it is framed between
two massive stone towers. The 978ft (298m) arch, weighing 80,000 tons (81,280 tonnes), was the
longest and heaviest steel arch in the world. The next was Bayonne Bridge (1931), which remains
one of the longest steel arches in the world today. It was built during the Depression by a team
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