Grande Ravine viaduct, Delta-leg bridge in Les Trois-Bassins, Reunion Island

The Grande Ravine Viaduct is a road bridge spanning 288 meters across a deep ravine, supported by two angled prestressed concrete legs. The structure is 20 meters wide and connects Saint-Paul to Etang-Sale on the western side of the island.

Construction began in 2006. The two 1,800-tonne steel box-girder halves were launched from each side of the ravine and joined before the cyclone season, by 20 December 2008. The viaduct was inaugurated on 6 May 2009 by Paul Vergès.

The structure links two coastal communities and shapes the landscape of the western coast as a defining engineering landmark. Local residents depend on this route daily as a vital connection through their region.

The viaduct carries the Route des Tamarins over the Grande Ravine, which is 300 metres wide and 170 metres deep, on the most direct road between Saint-Paul and L'Étang-Salé. It has four traffic lanes with very narrow hard shoulders, so drivers cross without stopping. The deck is 288 metres long and 22.7 metres wide.

The steel box girder was fabricated in 12 elements at the Eiffel factory in Lauterbourg, Alsace, then shipped from Antwerp to Réunion. On site the two 1,800-tonne halves were pushed out from both sides of the ravine, resting on the concrete struts and held by internal cables anchored behind the abutments, and joined before the cyclone season of 20 December 2008.