|Heritage status||Listed as cultural heritage since 1921|
|Design||Roman arch bridge|
|Total length||181.7 m|
|Longest span||28.8 m|
|Number of spans||6|
|Load limit||52 t|
|Designer||Caius Julius Lacer|
|Construction begin||104 AD|
|Construction end||106 AD|
The Alcántara Bridge (also known as Trajan's Bridge at Alcantara) is a Roman stone arch bridge built over the Tagus River at Alcántara, Spain, between 104 and 106 AD by an order of the Roman emperor Trajan in 98. It bears the inscription Pontem perpetui mansurum in saecula (I have built a bridge which will last forever) on the archway over the central pier.
The Alcántara Bridge has taken more damage from war than from the elements. The Moors destroyed the smallest arch on the left side in 1214. This was rebuilt centuries later in 1543 with stone from the original quarries. The second arch on the right side was destroyed by the Spanish to stop the Portuguese and was repaired in 1762 by Charles III, only to be blown up again in 1809 to stop the French. Temporary repairs were made in 1819 and were replaced in 1860 with mortared masonry.
The bridge originally measured 190 m in length, which is today reduced to 181.7 m. The clear spans of the six arches from the right to the left riverside are 13.6, 23.4, 28.8, 27.4, 21.9 and 13.8 m.
- Patrimonio histórico: Bienes culturales protegidos. Consulta de bienes inmuebles. Bien: "Puente de Alcántara", retrieved 13-01-2010 (Spanish)
- Galliazzo 1994, p. 354
- From river bed to deck, excluding the triumphal arch (Galliazzo 1994, pp. 354f.). O'Connor 1993, p. 109 gives 48 m, 40–42 m for the height above the water level plus 14 m for the triumphal arch.
- Galliazzo 1994, p. 356
- Durán Fuentes 2004, p. 237
- Alcantara Bridge at Structurae
- Puente de Alcántara sobre el Tajo, en Cáceres (Spanish)
- Video of the bridge
- Video of Alcántara