It's a 38.8 meter high multipurpose gravity dam that Kagawa prefecture is responsible for.

With repeated flooding of the Kamobu River, in 1966 to protect the water supply for Shido and Nagao cities (now both a part of Sanuki City) a Kamobu River integrated project was planned.

In addition to the lake shore development as Maeyama park and campground, the foothill's Kubo Hiroshi and Nagao Temples are tied to the 88 temples of Shikoku pilgrimage, so there are 88 enshrined Jizō statues to symbolize the journey.

On the left bank there is the Nagao roadside rest area, Pilgrimage Exchange Salon, and the Sanuki City Elementary school, which was relocated due to dam construction.

After relocation, a new 3-story reinforced concrete building was built with a swimming pool on the roof.