Viaduc de la Bresle, bridge in France

The viaduc de la Bresle is a 755-metre concrete viaduct carrying the A29 motorway across the Bresle valley north of Aumale. Its deck, 19.64 metres wide and 4 metres deep, rests on tapering oblong piers, with a maximum height of 38 metres above the ground. The deck has a constant 1.5% slope and is built in a straight line.

The viaduct was built between 2002 and 2004 and opened on 14 January 2005, when the A29 section linking the A28 near Saint-Germain-sur-Eaulne to the A16 near Salouël entered service. SANEF launched a design-build competition with Scetauroute as project manager; five teams took part and Razel won with AOA Architectes, proposing an all-concrete structure inspired by the Scardon viaduct.

The viaduct carries the A29 between the A28 near Saint-Germain-sur-Eaulne and the A16 near Salouël, crossing the Bresle valley north of Aumale. It is a motorway structure with no pedestrian walkway, so it can only be crossed by car. The deck runs in a straight line on a constant 1.5% slope, climbing from one bank to the other.

The bridge was built using a special pushing technique in which large prefabricated concrete sections were shifted into place. The marshy ground beneath required deep pilings that extend up to 33 meters underground to provide stable support.