The bridges connect the islands of Ōyano-jima, Nagaura-jima, Ike-jima, and Maeshima, and were completed on September 24, 1966.
The completion of these bridges coincided with the popularization of automobiles in Japanese families, with the launch of the Nissan Sunny 1000cc series and the Toyota Corolla 1100cc series, foretelling the so-called "My Car" age.
This bridge connects Misumi, the tip of the Uto Peninsula, Kumamoto Prefecture with Maeshima island.
This is a rigid-frame bridge of concrete color, connecting Ooike-jima and Maeshima.
This is a pipe-arch bridge, painted in red, connecting Maeshima and Matsushimachō, Aizu, Kami-Amakusa.