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The Abetxuko Bridge is an innovative and unique steel truss bridge with organic forms in Vitoria,(Spain).

The Abetxuko bridge over the Zadorra River is one of several projects being built by Vitoria council to improve mobility for its citizens and, above all, for the inhabitants of the Abetxuko area who for several decades have only been able to reach the city centre via an old, 6m-wide bridge. The narrow deck only has space for two carriageways and for narrow pedestrian walkways. Crossing the bridge was risky for pedestrians as they are so close to the traffic, a danger which the council decided to eliminate in 2005. Also the old bridge had limited hydraulic capacity.

The construction of the bridge was also central to the regeneration plan for the area (the green corridor of Vitoria). The project was intended to improve the mobility between the Abetxuko neighbourhood and the centre of Vitoria, connecting the neighbours physically and socially.

Description
The bridge is a continuous structure with three spans of 26m + 40m + 26m and with a total deck width of 31.4m. It carries four road traffic lanes, a central tramway line with two tracks, and two pedestrian walkways. The structural system consists of two parallel trusses with organic forms, their dimensions adjusted according to the structural requirements. The trusses are inclined 5º from the vertical to improve the aesthetic appearance of the bridge.

The designers responsible for the creation of the bridge, which have defined the structure as a living work capable of fitting into its surroundings, have used weathering steel to recall the work of Basque artists such as Chillida or Oteiza. In addition, the bridge has the property of changing in colour over time, something that, together with the shadows it projects at certain times of the day, transforms it into a structure that changes together with its surroundings.

The total cost of the structure was approximately €2.7million (935 €/m2), which is only about 10-15% more than a standard steel bridge of the same dimensions.

Construction
Construction of the bridge began in March 2006, and was successfully completed in December.