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正式名称は「明正井路第一拱石橋（めいせいいろ）」といい、1919年(大正8年)に竣工されました。連数(6連)、橋の長さ共に日本一を誇る石橋水路橋で、現在も水路には水を湛えています。高千穂へと通じる県道にかかる日本最大規模の6連石造アーチ橋は、美しい6つのアーチが山裾の川から車道までを跨いでかかる堂々とした姿が印象的です。松本清張の『詩城の旅びと』では「ローマの遺跡を思わせる」という一説があります。
■土木学会選奨土木遺産
