This viaduct belongs to the new Basque Country railway network. Section: Legorreta. The viaduct allows for the passage of the high-speed rail line over Zubina river and the road GI-4471, located between K.P. 206+890 and K.P. 207+034. Two prestressed concrete structures form this 144m long box girder bridge, which is divided into three spans of 44m + 56m+ 44m and follows a straight alignment. The total deck width is 14m and it includes a double track line. In order to provide more versatility to the superstructure, the design encompassed two different options to support the railway on the structure: slab track and track on sleepers and ballast. The cross-section is a box girder with an inferior width of 5.50m and an upper width of 6.40m. Lateral cantilevers have a total length of 3.80m, being their depth 0.53m at springings and 0.2m at ends.

The viaduct is a 3.60 m long constant depth structure. A 2% cross slope allowing for water removal starts in the center of the bridge. Pot bearings on piers and abutments support the deck. Piers are made of reinforced concrete with a hollow rectangular section and chamfered corners. A shallow foundation with footing distributes loads. Perpendicular wing walls to retain soil have been added to the reinforced concrete shallow foundation closed abutments.