The Shimajigawa Dam is a concrete gravity dam on the Shimaji River north of Shūnan in Yamaguchi Prefecture, Japan. The dam was completed in 1980 and was the first dam to be completely constructed with the roller-compacted concrete method. References Dams in Yamaguchi Prefecture Gravity dams Dams completed in 1980 Roller-compacted concrete dams Shūnan, Yamaguchi