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 m above mean sea level. It was inaugurated in 1979. The dam is made of compacted loose materials. It has a volume of 4 e6m3, measuring 37 m in height and 3500 m in length. It is used primarily for the generation of hydroelectricity, with an installed power of 127.8 MW. It generates on average 560 GWh per year. It also serves as a check dam for El Chocón, located upstream. The reservoir has an area of 38.6 km2 and a volume of 300 e6m3. Its depth is 7.7 m on average (maximum: 15 m).