Other sources however vary from eleven to fifteen arches. The total length of the rectilinear structure was , of which spanned the riverbed at low water. If one adds the clear span of the arches and assumes, on the basis of the preserved piers, an average pier thickness of , then the distance between both bridge ramps was (= 178 + 15 x 4.4), which corresponded to a river cross section of 73%. By comparison, the corresponding discharge profiles for the Roman bridges of Córdoba, of Mérida and Salamanca were 62%, 64% and 80% respectively.