Echinghen Viaduct, Transportation viaduct in Northern France

The Echinghen Viaduct is a road bridge in Northern France that spans just over 1,300 meters and carries multiple lanes of traffic. The structure uses reinforced concrete and bridges the landscape with individual spans of up to 110 meters.

Built in 1996–1997 for the new A16 motorway, the viaduct is one of the three "viaducs du Boulonnais" with Quéhen and Herquelingue. In November 2017, Sanef inspectors found about ten corroded prestressing cables among more than 300; heavy goods vehicles were banned until 20 June 2018. The eleven damaged cables were replaced between mid-2018 and December 2019, and all restrictions were lifted on 24 December 2019.

The viaduct is one of the three "viaducs du Boulonnais", together with the viaducs de Quéhen and d'Herquelingue. It is the longest bridge in the Pas-de-Calais department and the 25th longest in France. The A16 it carries links the Paris region to the Belgian border via Beauvais, Amiens, Abbeville, Boulogne-sur-Mer, Calais and Dunkerque.

The bridge is visible from the road and can be observed from passing vehicles. Pedestrians do not have direct access since the structure is intended exclusively for motorized traffic.

In November 2017, Sanef inspectors found about ten corroded prestressing cables among the more than 300 steel cables holding the deck. Eleven cables were removed and replaced between mid-2018 and December 2019, and heavy goods vehicles were banned from the viaduct until 20 June 2018.