The Tarraco aqueduct took water from the Francolí river, 15 kilometers north of Tarragona. It probably dates from the time of the emperor Augustus.
Les Ferreres Aqueduct is composed of two levels of arches: the upper section has 25 arches, and the lower one has 11. All arches have the same diameter of 20 Roman feet (5.9m) with a variation of 15 cm. The distance between centres of the pillars is 26 Roman feet (7.95m). It has a maximum height of 27 metres (89 ft) and a length of 249 metres (817 ft), including the ends where the specus (water channel) runs atop a wall.