A multipurpose dam, Kusaki Dam was built in Azuma Village, Seta County, Gunma Prefecture (present Seta County, Gunma Prefecture), along the upper stream of Watarase-gawa River mainly for controlling flood of Watarase-gawa River and for supply of water for the metropolitan area (completed in 1977).
渡良瀬川の治水と首都圏への水道供給を主目的にした多目的ダム、草木ダムが渡良瀬川上流の群馬県勢多郡東村(群馬県勢多郡)に作られた（1977年竣工）。