Okuno Dam

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Okuno Dam
Okuno Dam 20120520.jpg
Official name 奥野ダム
Location Shizuoka Prefecture, Japan
Coordinates 34°56′09″N 139°04′11″E / 34.93583°N 139.06972°E / 34.93583; 139.06972Coordinates: 34°56′09″N 139°04′11″E / 34.93583°N 139.06972°E / 34.93583; 139.06972
Construction began 1972
Opening date 1989
Operator(s) Shizuoka Prefecture
Dam and spillways
Impounds Itō-Ōkawa River
Height 63 meters
Length 323 meters
Creates Lake Matsukawa
Total capacity 4,600,000 m3
Catchment area 11.7 km2
Surface area 31 hectares

Okuno Dam (奥野ダム, Okuno damu) is a multi-purpose dam on the Itō-Ōkawa River, located in Itō, Shizuoka, Japan.


The Itō-Ōkawa River is a primary source of drinking water for the city of Itō, on the eastern coast of the Izu Peninsula. However, the area is a region of heavy rains, and is prone to typhoons. The 1958 Kanogawa Typhoon caused widespread flooding and damage to property in the Itō area. From the 1960s, the area around Itō began to develop as a bedroom community for Atami, as well as a popular vacation destination due to its beaches, hot spring resorts and ease of access to Tokyo. In 1972, a project office was established and construction begun by a consortium consisting of Kajima Construction and Kumagai Gumi. Due to the geography of the site, a rock-fill dam design with a central spillway and a height of 63 meters was selected. The estimated completion time was 1983. However, due to difficulties arising from transporting the necessary stones from distant locations, work was not completed until 1989. Although styled as a 'multi-purpose dam', the dam has no associated hydroelectric power facilities, and its primary function is flood control and the supply of drinking water.

The reservoir impounded was named Lake Matsukawa (松川湖, Matsukawa-ko) in 1987, and is a popular recreational area for sports fishermen and bird-watching.


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