Built on three levels, the Pont is 49 m (161 ft) high above the river at low water and 274 m (899 ft) long.
Its width varies from 9 m (30 ft) at the bottom to 3 m (9.8 ft) at the top.
The three levels of arches are recessed, with the main piers in line one above another.
The span of the arches varies slightly, as each was constructed independently to provide flexibility to protect against subsidence.
Each level has a differing number of arches:
The first level of the Pont du Gard adjoins a road bridge that was added in the 18th century.
The water conduit or specus, which is about 1.8 m (6 ft) high and 1.2 m (4 ft) wide, is carried at the top of the third level.
The upper levels of the bridge are slightly curved in the upstream direction.
It was long believed that the engineers had designed it this way deliberately to strengthen the bridge's structure against the flow of water, like a dam wall.
However, a microtopographic survey carried out in 1989 showed that the bend is caused by the stone expanding and contracting by about 5 mm (0.20 in) a day under the heat of the sun.
Over the centuries, this process has produced the current deformation.

The Pont du Gard was constructed largely without the use of mortar or clamps.
It contains an estimated 50,400 tons of limestone with a volume of some 21,000 m³ (740,000 cu ft); some of the individual blocks weigh up to 6 tons.
Most of the stone was extracted from the local quarry of Estel located approximately 700 metres (2,300 ft) downstream, on the banks of the Gardon River.
The coarse-grained soft reddish shelly limestone, known locally as "Pierre de Vers", lends itself very well to dimension stone production.
The blocks were precisely cut to fit perfectly together by friction and gravity, eliminating the need for mortar.
The builders also left inscriptions on the stonework conveying various messages and instructions.
Many blocks were numbered and inscribed with the required locations, such as fronte dextra or fronte sinistra (front right or front left), to guide the builders.

The method of construction is fairly well understood by historians.
The patron of the aqueduct – a rich individual or the city of Nîmes itself – would have hired a large team of contractors and skilled labourers.
A surveyor or mensor planned the route using a groma for sighting, the chorobates for levelling, and a set of measuring poles five or ten Roman feet long.
His figures and perhaps diagrams were recorded on wax tablets, later to be written up on scrolls.
The builders may have used templates to guide them with tasks that required a high degree of precision, such as carving the standardised blocks from which the water conduit was constructed.

The builders would have made extensive use of cranes and block and tackle pulleys to lift the stones into place.
Much of the work could have been done using simple sheers operated by a windlass.
For the largest blocks, a massive human-powered treadmill would have been used; such machines were still being used in the quarries of Provence until as late as the start of the 20th century.
A complex scaffold was erected to support the bridge as it was being built.
Large blocks were left protruding from the bridge to support the frames and scaffolds used during construction.
The aqueduct as a whole would have been a very expensive undertaking; Émile Espérandieu estimated the cost to be over 30 million sesterces, equivalent to 50 years' pay for 500 new recruits in a Roman legion.

Although the exterior of the Pont du Gard is rough and relatively unfinished, the builders took care to ensure that the interior of the water conduit was as smooth as possible so that the flow of water would not be obstructed.
The walls of the conduit were constructed from dressed masonry and the floor from concrete.
Both were covered with a stucco incorporating minute shards of pottery and tile.
It was painted with olive oil and covered with maltha, a mixture of slaked lime, pork grease and the viscous juice of unripe figs.
This produced a surface that was both smooth and durable.

Although the Po
Built on three levels, the Pont is 49 m (161 ft) high above the river at low water and 274 m (899 ft) long. Its width varies from 9 m (30 ft) at the bottom to 3 m (9.8 ft) at the top. The three levels of arches are recessed, with the main piers in line one above another. The span of the arches varies slightly, as each was constructed independently to provide flexibility to protect against subsidence. Each level has a differing number of arches:
The first level of the Pont du Gard adjoins a road bridge that was added in the 18th century. The water conduit or specus, which is about 1.8 m (6 ft) high and 1.2 m (4 ft) wide, is carried at the top of the third level. The upper levels of the bridge are slightly curved in the upstream direction. It was long believed that the engineers had designed it this way deliberately to strengthen the bridge's structure against the flow of water, like a dam wall. However, a microtopographic survey carried out in 1989 showed that the bend is caused by the stone expanding and contracting by about 5 mm (0.20 in) a day under the heat of the sun. Over the centuries, this process has produced the current deformation.
The Pont du Gard was constructed largely without the use of mortar or clamps. It contains an estimated 50,400 tons of limestone with a volume of some 21,000 m³ (740,000 cu ft); some of the individual blocks weigh up to 6 tons. Most of the stone was extracted from the local quarry of Estel located approximately 700 metres (2,300 ft) downstream, on the banks of the Gardon River. The coarse-grained soft reddish shelly limestone, known locally as "Pierre de Vers", lends itself very well to dimension stone production. The blocks were precisely cut to fit perfectly together by friction and gravity, eliminating the need for mortar. The builders also left inscriptions on the stonework conveying various messages and instructions. Many blocks were numbered and inscribed with the required locations, such as fronte dextra or fronte sinistra (front right or front left), to guide the builders.
The method of construction is fairly well understood by historians. The patron of the aqueduct – a rich individual or the city of Nîmes itself – would have hired a large team of contractors and skilled labourers. A surveyor or mensor planned the route using a groma for sighting, the chorobates for levelling, and a set of measuring poles five or ten Roman feet long. His figures and perhaps diagrams were recorded on wax tablets, later to be written up on scrolls. The builders may have used templates to guide them with tasks that required a high degree of precision, such as carving the standardised blocks from which the water conduit was constructed.
The builders would have made extensive use of cranes and block and tackle pulleys to lift the stones into place. Much of the work could have been done using simple sheers operated by a windlass. For the largest blocks, a massive human-powered treadmill would have been used; such machines were still being used in the quarries of Provence until as late as the start of the 20th century. A complex scaffold was erected to support the bridge as it was being built. Large blocks were left protruding from the bridge to support the frames and scaffolds used during construction. The aqueduct as a whole would have been a very expensive undertaking; Émile Espérandieu estimated the cost to be over 30 million sesterces, equivalent to 50 years' pay for 500 new recruits in a Roman legion.
Although the exterior of the Pont du Gard is rough and relatively unfinished, the builders took care to ensure that the interior of the water conduit was as smooth as possible so that the flow of water would not be obstructed. The walls of the conduit were constructed from dressed masonry and the floor from concrete. Both were covered with a stucco incorporating minute shards of pottery and tile. It was painted with olive oil and covered with maltha, a mixture of slaked lime, pork grease and the viscous juice of unripe figs. This produced a surface that was both smooth and durable.
Although the Po
Pont du Gard