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Whale Rock Reservoir is a reservoir near Cayucos in San Luis Obispo County, California. The reservoir was formed by the building of Whale Rock Dam on Old Creek by the Whale Rock Commission. It is a 193 foot (59 m) tall earthfill dam and was completed in 1961. The reservoir has a capacity of 40,662 acre feet (50,000,000 m³). The watershed has an area of 20.6 square miles (53 km²). It provides drinking water for the city of San Luis Obispo the California Men's Colony, and Cal Poly. The water is brought to San Luis Obispo by the 17.6 mile (28 km) long, 30 inch (760 mm) diameter Whale Rock Conduit. There is a 800 kW hydroelectric plant at the end of the pipeline near Cal Poly.
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