Viaduc de la ravine Fontaine, Deck arch bridge in Saint-Leu, Réunion Island, France.

The Viaduc de la ravine Fontaine is a steel-concrete composite deck arch bridge on the Route des Tamarins in Saint-Leu. Its deck is 198.884 m long and 20.10 m wide, carried by 11 piers spaced 16.74 m apart, with a 1.40 m deep deck. The arch spans 170 m with a rise of 22.50 m; its trapezoidal box section is 4.116 m deep at the abutments and 1.049 m at mid-span.

The viaduct is one of four major structures built for the Route des Tamarins, a new section of national road 1 on Réunion. Its design team brought together the Greisch engineering office (Belgium), T Ingénierie (Switzerland), and Coyne et Bellier and Seti (France). Demathieu & Bard and GTOI, a Colas subsidiary, handled civil engineering, while Cimolai S.p.A. of Italy supplied the steel framework.

The viaduct was built through collaboration between engineering firms from Belgium, Switzerland, and France, showcasing international expertise in bridge construction on Reunion Island. This project demonstrated how different countries combined their technical skills to create an extraordinary structure.

The viaduct carries the Route des Tamarins, a section of National Route 1, across the ravine Fontaine in Saint-Leu. It also has a bungee-jumping walkway, so the deck is not only a road crossing. The deck is 20.10 m wide and 1.40 m high, with 11 small piers spaced 16.74 m apart.

The viaduct carries a bungee-jumping platform, a feature noted in the sources alongside its road deck. The steel-concrete deck is 198.884 m long and rests on 11 small piers spaced 16.74 m apart, while the arch below spans 170 m with a rise of 22.50 m. The steel framework was supplied by the Italian firm Cimolai S.p.A.