阿蘇長陽大橋, Box girder bridge in South Aso Village, Japan
The Aso Choyo Bridge crosses the Kurogawa River with a length of 276 meters supported by three hollow piers. The structure consists of four spans built using a box girder design.
The bridge was built in 1997 and replaced a stone arch bridge from 1900 at the same location. It served as a route to transport materials for the Tatenodam Dam construction.
A monument on the bridge displays poems carved into andesite stone by the poet couple Tekkan and Akiko Yosano. This poetic inscription reflects the connection between the structure and local literary heritage.
After repairs following the 2016 Kumamoto earthquake, the structure reopened in August 2017 and improved travel between Kumamoto and South Aso. Visitors should be aware that the region experiences seismic activity and occasional maintenance work.
The central pier extends 73 meters from foundation to girder and spans deep valleys with unequal field lengths. This asymmetry allows the structure to navigate the complex terrain.
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