Hollywood Reservoir, Water reservoir in Hollywood Hills, California.

Hollywood Reservoir is an artificial body of water in the Hollywood Hills of California, sitting at the base of the Santa Monica Mountains. The area is bordered by a concrete dam and offers a looped path with views of the Hollywood Sign and the surrounding slopes.

The Mulholland Dam, built in 1924, created the reservoir as part of Los Angeles's water storage and supply system; the design came from the Bureau of Water Works and Supply, later the LADWP. Within days of the St. Francis Dam collapse in March 1928, William Mulholland ordered the reservoir lowered amid public fears. In 1931 the LADWP capped it permanently at 4,000 acre-feet; it now usually holds about 2,800 acre-feet.

The paved loop around the water draws locals who jog or cycle in the early morning or at sunset, making it a regular part of daily routines. Dog walkers and families with strollers share the path, creating a steady rhythm of movement and quiet social exchange.

Access begins from Lake Hollywood Drive, where parking is possible along the northern stretch of the road. The trail is paved and open to walkers, runners and cyclists, with early mornings or late afternoons tending to be less crowded.

The water has appeared in numerous films and television shows as a filming location, often for scenes requiring calm or tension. Despite its closeness to residential neighborhoods, the water itself remains closed to the public, with only the perimeter path open for walking.