If you're heading away from Kumamoto city in the direction of Miyazaki Prefecture you probably cross Yamato-cho at some point. The bridge is not located aside of the mainroad 445/218, but close enough and traffic signs will point you in the right direction.
Every Saturday, Sunday at noon water from the bridge can be seen. Apart from noon, some tour-buses pay money to let the water flow from the bridge, so you might just be lucky if you miss the 12:00 show.
Yamato-cho is known for its croquettes (there are many kinds including horse meat croquettes) which can be bought in town, not too far from the bridge. Definitely a good option for lunch!
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