The Arroyito Dam (in Spanish, Embalse de Arroyito) is the fifth of five dams on the Limay River in northwestern Argentine Patagonia (the Comahue region), at 315 metres (1,033 ft) above mean sea level.

It is used primarily for the generation of hydroelectricity, with an installed power of 127.8 megawatts (171,400 hp).

It also serves as a check dam for El Chocón, located upstream.

The reservoir has an area of 38.6 square kilometres (14.9 sq mi) and a volume of 300 million cubic metres (11×10^9 cu ft).

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