The reservoir was formed by the building of Whale Rock Dam on Old Creek by the Whale Rock Commission. It is a 193-foot tall earthfill dam that was completed in 1961. The reservoir has a capacity of 40,662 acre feet . The watershed has an area of 20.6 square miles . It provides drinking water for the city of San Luis Obispo, the California Men's Colony, Cal Poly, and the Cayucos Area Water Organization. The water is brought to San Luis Obispo by the 17.6 mile long, 30-inch diameter Whale Rock Conduit. There is an 800 kW hydroelectric plant at the end of the pipeline near Cal Poly.
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Address: San Luis Obispo, United States
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