Gandō Dam

Gandō Dam (岩洞ダム, Gandō damu) is a dam on the Tandogawa River, a branch of the Kitakami River in Morioka, Iwate Prefecture, Japan, completed in 1960.

Gandō Dam
Location of Gandō Dam in Japan
Official name	岩洞ダム
Location	Morioka, Iwate, Japan
Coordinates	39°49′37″N 141°22′24″E
Opening date	1960
Owner(s)	Iwate Prefecture
Dam and spillways
Type of dam	Rock-fill dam
Impounds	Tandogawa River
Height	40 meters
Length	351 meters
Dam volume	850,000 m3
Reservoir
Creates	Gandō Lake
Total capacity	65,600,000 m3
Catchment area	211.1 km2
Surface area	577 ha
Power Station
Operator(s)	Iwate Prefecture
Annual generation	49,300 KW

History

The need for storage reservoirs in the Kitakami River valley for irrigation purposes was recognized by the Meiji government at the start of the 20th century, due to repeated crop failures and conflicts between various communities over water rights. The river also suffered from severe environmental problems with acidic runoff from upstream mining operations. Plans for a series of dams was initiated in 1941 by the Ministry of Agriculture and Forestry, but all work was halted during World War II. The plan was revived after the war, and the Gandō Dam was the second to be completed after the Sannōkai Dam.

Design

The Gandō Dam was constructed to provide irrigation water, and also to supply the 41,000 KW Gandō No.1 Hydroelectric Plant and 8,300 KW Gandō No.2 Power Plants. The design of the dam is that of a sloped wall rockfill dam. The dam was completed in 1960 by the Taisei Corporation.

The Gandō Reservoir created by the dam has been stocked with carp and Japanese smelt and is a popular vacation location due to its ease of access via Japan National Route 455.

External links

• Familiar and Invaluable 100 Selected Dam Lakes (in Japanese)
• Japan Dam network (in Japanese)