Hirokawa Bosai Dam is a rockfill dam located in Fukuoka Prefecture in Japan. The dam is used for flood control and irrigation. The catchment area of the dam is 9.4 km2. The dam impounds about 12 ha of land when full and can store 990 thousand cubic meters of water. The construction of the dam was completed in 1972. References Dams in Fukuoka Prefecture 1972 establishments in Japan