After the Tone-gawa and Yodo-gawa River systems were designated for water resources development based on the 'Water Resources Development Basic Plan,' their comprehensive management around utilization was transferred to Water Resources Development Public Corporation (now Japan Water agency), including the operation of Takayama Dam (former Tsukigase Dam) and Udagawa Dam.
利根川と共に淀川は「水資源開発基本計画」の指定河川として以後水資源開発公団（現・水資源機構）が総合的な利水事業を行う事となり、高山ダムは宇陀川ダムと共に公団に事業が移管された。