It supplies water to the company's hydroelectric plant, Ōhashi Power Station, which can produce up to 5,500 kW.

The Takayabu Power Station, (14.3MW), was built at the Okuyoshino torrents of the upper reach of River Yoshino, and it commenced operation in 1930 (Shōwa period 5).

Because of this, a plan was made to regulate the quantity water flowing in the river by forming a large-scale artificial lake and building the Ōhashi Dam between Takayabu Power Station and the upstream inflow.

The results of the geological survey were to confirm that rock suitable for concrete aggregate could not be collected from around the dam's construction site.

Therefore, an overhead freight-carrying cable was built to Shougase (勝賀瀬) in the Niyodo River Basin, 22 km to the south and, rock was collected to and brought from there.

After that, Central Shikoku Electric Power Company, went ahead with the construction of a diversion canal from up stream of the Ōhashi Dam to the Niyodo River.