Onahama Marine Bridge, Extradosed bridge in Iwaki, Japan
The Onahama Marine Bridge is a modern extradosed bridge spanning 510 meters across Onahama Port, connecting the eastern port district to pier three. The structure includes two traffic lanes totaling 7 meters wide and pedestrian paths ranging from 3 to 4.5 meters, with its central span reaching 120 meters.
The bridge opened in March 2018 and received the Tanaka Prize from the Japan Society of Civil Engineers for its innovative construction methods in maritime conditions. This achievement marked an important milestone for Iwaki in port infrastructure development.
The bridge's name appears in traditional Japanese calligraphy created by Shoko Kanazawa, a respected cultural figure from Iwaki. It has become a symbol connecting the local community to modern engineering achievement.
Visitors can cross on foot or by car, with a speed limit of 40 kilometers per hour maintained throughout. The separate pedestrian paths provide safe passage over the port area and opportunities to view the harbor and sea.
This is Japan's first extradosed bridge in a port setting, combining the technical advantages of both girder and cable-stayed designs in maritime conditions. The design specifically addresses challenges posed by constant water movement and salt water exposure.
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