The Misakubo Dam is a dam on the Tonaka River, a tributary stream of the Misakubo River, itself a tributary of the Ōi River, located in Tenyrū-ku Hamamatsu, Shizuoka Prefecture, on the island of Honshū, Japan.
The potential of the Ōi River valley for hydroelectric power development was realized by the Meiji government at the start of the 20th century. The Ōi River was characterized by a high volume of flow and a fast current. Its mountainous upper reaches and tributaries were areas of steep valleys and abundant rainfall, and were sparsely populated. From the 1930s through the 1960s, numerous concrete gravity dams had been constructed on the main flow of the Ōi River, and on its various tributary streams. The remote and steep-walled Misakubo valley was uninhabited, and was designated as the site for a new dam in the early 1960s.
The Misakubo Dam was constructed to provide water for the 50,000 KW Misakubo Hydroelectric Plant. Construction work be