The bridge over Vallelargo stream is a project that is attributed to the architect Ventura Rodríguez. It was built to make it easier to reach the Palace of Infante don Luis. The bridge serves the road from Boadilla to Segovia as well as the Madrid-Segovia highway, near San Antón and Galapagar Country Inn (Venta de San Antón y Galapagar). Both roads were well traveled due to the regular seasonal relocations of Charles III’s court.
The extreme renovation that Prince Luis made to the palace as well as the cultural events that he sponsored and the impressive hunting grounds in Monte de Boadilla all enticed a large number of visitors to travel into this area. For that reason, the access routes to the estate needed to be improved through architectural works such as this bridge. These works also gave arriving visitors a sense of the high status of the residents of the palace.
This elegant bridge, which was restored in 2013, consists of a single three-centered arch with granite voussoirs. The stonework parapet and abutments open on each side to form roadways. The banks of the stream are now paved over in stone to prevent sink holes from forming in the ground areas that support the bridge.