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Yomasari Dam

Yomasari Dam
YomasariDamu Hachinohe.jpg
Yomasari Dam is located in Aomori Prefecture
Yomasari Dam
Location of Yomasari Dam in Aomori Prefecture
Yomasari Dam is located in Japan
Yomasari Dam
Yomasari Dam (Japan)
Official name世増ダム
LocationHachinohe, Aomori, Japan
Coordinates40°23′25″N 141°28′50″E / 40.39028°N 141.48056°E / 40.39028; 141.48056
Construction began1976
Opening date2003
Operator(s)Ministry of Agriculture, Forestry and Fisheries (Japan)
Dam and spillways
ImpoundsNiida River
Height52 meters
Length247 meters
CreatesLake Aoba
Total capacity36,500,000 m³
Catchment area398 km²
Surface area180 hectares

The Yomasari Dam (世増ダム, Yomasari damu) is a dam on the Niida River, located in the city of Hachinohe, Aomori Prefecture in the Tōhoku region of northern Honshū, Japan.


Yomasari Dam was designed as a multi-purpose dam, to provide for flood control in the event of heavy rains or typhoons, which had potential to flood downtown Hachinohe. The reservoir created was intended to provide water for tap water, as well as agricultural and industrial purposes, and to create a new recreational area for fishing and boating for the residents of Hachinohe. However, there is no hydroelectric power station associated with the dam.

Preliminary design work began on the Yomasari Dam in 1976, with main construction beginning in 1989, and was completed by 2003 by a consortium of the Obayashi Corporation, Sumitomo Mitsui Construction, and Tekken Corporation.


The Yomasari Dam is a hollow-core concrete gravity dam with several central spillways.


  • Japan Commission on Large Dams. Dams in Japan:Past, Present and Future. CRC Press (2009). ISBN 978-0-415-49432-8
  • photo page with data