Ive been working for some time on categoryRoman bridges but you certainly provide new infos here This is what a webpage says about the Alconetar bridge destroyed in the th century  arches left moved in   I hope they did not change the arch structure then Here the most authoritative photo httpusersserviciosretecalesjomicoeAlconetarJPG    El puente de Alcontar sobre el Tajo  en Garrovillas Cceres cerca de Alcntara estaba en la Va de la Plata Debi de ser tambin monumental Fue destruido por los rabes en el siglo XIII y nunca despus reconstruido Hoy da es un puente sin ro Al construir el pantano de Alcntara hubiera quedado sepultado por las aguas En el ao  se trasladaron sus restos a un nuevo emplazamiento Apenas quedan tres arcos de los  que tuvo Se aprecia su solidez en sus fuertes machones   As for the Pons Fabricius there are some Roman bridges and even more medieval ones whose arches are designed somewhere between semicircular and segmental This is only natural as a demanding structure the segmental arch bridge could not have been invented in a day but must have been reasonably the result of a lengthy development process This means there are certainly transitory forms between the two types what we need in every single case is the spanrise ratio of the bridge to make qualified judgements on its segmental or semicircle character