The Pont du Gard aqueduct is one really amazing masterpice of Roman Architecture and was built shortly before the Christian era to allow the aqueduct of Nimes (which is almost 50 km long) to cross the Gard river. The Roman architects and hydraulic engineers who designed this bridge, which stands almost 50 m high and is on three levels, the longest measuring 275 m, created a technical as well as an artistic masterpiece.
ont du Gard means literally bridge of the Gard river. The Gard river, which has given its name to the Gard departement, does not actually exist under this name. The river, formed by many tributaries, several of which are called Gardon, is itself called Gardon until its end.
Its construction is attributed to Augustus, son-in-law and aide, Marcus Vipsanius Agrippa. Designed to carry the water across the small Gardon river valley, it was part of a nearly 50 km (31 mi) aqueduct that brought water from springs near Uzes to the Roman city of Nemausus (Nimes). The full aqueduct had a gradient of 34 cm/km (1/3000), descending only 17 m vertically in its entire length and delivering 20,000 cubic meters (44 million gallons) of water daily.
It was constructed entirely without the use of mortar. The aqueduct’s stones, some of which weigh up to 6 tons, are held together with iron clamps. The masonry was lifted into place by block and tackle with a massive human-powered treadmill providing the power for the winch. A complex scaffold was erected to support the aqueduct as it was being built. The face of the aqueduct still bears the mark of its construction, in the form of protruding scaffolding supports and ridges on the piers which supported the semicircular wooden frames on which the arches were constructed. It is believed to have taken about three years to build, employing between 800 and 1,000 workers.
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