Kumagai Gumi
Work on the Miho Dam began in 1969 by the Kumagai Gumi construction company; and was completed in 1978. Construction involved the relocation of 233 households from the area scheduled to be flooded by the dam. Part of the relocation agreement included a promise to retain historic local place names, which resulted in the name of the dam being changed from the planned "Sakawa Dam" to "Miho Dam" in reflection of the local district name.