The aqueduct is built of unmortared, brick-like granite blocks. During the Roman era, each of the three tallest arches displayed a sign in bronze letters, indicating the name of its builder along with the date of construction. Today, two niches are still visible, one on each side of the aqueduct. One of them is known to have held the image of Hercules, who according to legend was founder of the city. The other niche now contains the images of the Virgen de la Fuencisla (the Patroness of Segovia) and Saint Stephen.