Aimata Dam

Aimata Dam (相俣ダム) is a dam built on the Akaya River, part of the class-A Tonegawa River system at Aimata in the city of Minami (the former village of Nīharimura), in the Tone District of Gunma Prefecture, Japan.

It is a gravity dam made of concrete, operated by the Ministry of Land, Infrastructure, Transport and Tourism's Kantō Regional Development Bureau, built to a height of 67.0 meters. As a member of the upstream Tonegawa River dam cluster, it supplies water to Tokyo and the Japanese capital region. The dam's purposes are flood prevention at the point where the Akaya River merges with the Tonegawa River in the former city of Tsukiyono, and energy generation via the Gunma Prefecture-operated hydroelectricity facilities, making it a multi-purpose dam. The artificial Akaya Lake was created by the dam.