Kiritappu Bridge, Iron arch bridge in Hamanaka, Hokkaido, Japan
Kiritappu Bridge is a modern iron arch structure that spans across Biwase Bay and Hamanaka Bay, connecting two coastal areas with a tied arch design. The engineering uses a distinctive arched form that allows it to cross the bays while providing a clear passage for traffic.
The bridge was completed in 1999, opening a direct road link between coastal areas that had previously relied on longer detours or water transport. This project marked a turning point in regional connectivity for eastern Hokkaido.
The bridge connects two coastal communities that were previously isolated by water, allowing fishermen and residents to maintain their daily routines more easily. This improved link has strengthened ties between settlements on opposite shores.
The bridge accommodates both vehicles and pedestrians as part of Hokkaido Prefectural Road Route 1039. Visitors can walk across at any time, though daytime provides better visibility for enjoying the bay views on either side.
The structure employs a tied arch system that allows it to span both bays without intermediate supports, a notable engineering approach for the time. This design choice solved the challenge of crossing deep water while maintaining clear passage for boats.
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