page_title: Pyramid Lake (Los Angeles County, California)
section_title: Geography
hierarchical_section_title: Pyramid Lake (Los Angeles County, California) / Geography
caption_attribution_description: English: Pyramid Lake in Angeles National Forest off of Interstate 5 south. Picture Taken 26 Jun 2009 Español: Lago Pirámide en Bosque Nacional de Angeles cerca de sur interestatal cinco. He tomado el foto en el 26 de junio 2009.
context_page_description: Pyramid Lake is a reservoir formed by Pyramid Dam on Piru Creek in the eastern San Emigdio Mountains, near Castaic, Southern California. It is a part of the West Branch California Aqueduct, which is a part of the California State Water Project. Its water is fed by the system after being pumped up from the San Joaquin Valley and through the Tehachapi Mountains.
context_section_description: Pyramid Lake is the deepest lake in the California Water Project system, built up along the steep canyon walls surrounding Piru Creek.
  The 180,000 acre⋅ft (220,000,000 m³) reservoir lies on the border between the Angeles National Forest and the Los Padres National Forest,  in the northwestern portion of Los Angeles County. It is to the west of Interstate 5 (I-5) south of Tejon Pass. The former alignment of US 99 is below the waters here, replaced by I-5.
  Just below the dam, Piru Creek returns to its natural state as it winds down through the Topatopa Mountains to feed into the Lake Piru reservoir and later the Santa Clara River. Pumps carry water from Pyramid Lake to Castaic Lake, which is the terminus of the west branch of the aqueduct. Pyramid and Castaic act as the upper and lower reservoirs for a 1,495-megawatt pumped storage hydroelectric plant.
caption: Pyramid Lake earthworks.
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