Located in Mamulan district of Lorestan Province, this bridge was built during the Achaemenid era. It used to span Kashkan river over the high cliffs of Mamulan. It is more than 150m long and 30m. high. The widest span 26.5m. It was rebuilt during the Sassanid era to connect the two capitals of Hegmataneh (Ecbatana) and Susa
This bridge was located among Iran’s ancient road ‘Shahi’.