Hollywood Reservoir, also known as Lake Hollywood, is a reservoir located in the Santa Monica Mountains in the Hollywood Hills neighborhood of Los Angeles, California. It is maintained by the Los Angeles Department of Water and Power. The reservoir and surrounding neighborhood are overlooked by the Hollywood Sign.
The reservoir is created by the Mulholland Dam, built in 1924, designed by the Los Angeles Department of Water and Power, then named the Bureau of Water Works and Supply, as part of the Los Angeles Aqueduct storage system.
The lake has a capacity of 7900 acre-ft, which is 2.5 billion US gallons (9,500,000 m3) and a maximum water depth of 183 feet (56 m). The reservoir level varies, though for most of the time after it was completed, it was kept a high level, and was filled on several occasions. Within days after the collapse of the St. Francis Dam William Mulholland ordered the Hollywood Reservoir lowered due to public fears of a repeat disaster.