Los Angeles Reservoir

Los Angeles Reservoir
Name	Los Angeles Reservoir
Location	Los Angeles, California
Type	Reservoir
Basin countries	United States
Created	19th century
Operator	Los Angeles Department of Water and Power
Area	700+ acres
Volume	~68,000 acre-feet

Los Angeles Reservoir is a municipal water storage facility serving the City of Los Angeles and surrounding communities in Los Angeles County, California. As part of a network of reservoirs, aqueducts, and treatment plants, the reservoir links to major regional projects such as the Los Angeles Aqueduct, the California State Water Project, and the Metropolitan Water District of Southern California import systems. It functions within the infrastructure operated by the Los Angeles Department of Water and Power, integrating supply, flood control, and urban planning priorities for Greater Los Angeles.

Overview

The reservoir occupies a footprint within the municipal utility system administered by the Los Angeles Department of Water and Power and is connected hydrologically to the Los Angeles River, the San Fernando Valley watershed, and downstream channels leading toward the Pacific Ocean. Its storage capacity supports potable supply for districts including Downtown Los Angeles, Hollywood, and West Los Angeles while providing strategic redundancy with other facilities such as Silver Lake Reservoir and Echo Park Lake. The site has been referenced in policy discussions involving the State Water Resources Control Board, the California Department of Water Resources, and regional planning agencies including the Southern California Association of Governments.

History

Construction and expansion of the reservoir occurred amid late 19th- and early 20th-century water development initiatives that also produced the Los Angeles Aqueduct engineered by William Mulholland and political contests involving the Owens Valley water dispute. The reservoir’s role evolved through the Great Depression era public works programs and post-World War II urbanization that brought demand from the San Fernando Valley and expanding suburbs. Legislative and administrative milestones affecting the reservoir include interactions with the California Environmental Quality Act and operational oversight by the Los Angeles Board of Water and Power Commissioners.

Design and Infrastructure

Engineered components include embankments, intake structures, sedimentation basins, and conveyance pipelines tied into the regional grid maintained by the Los Angeles Department of Water and Power. The design references standards from the United States Army Corps of Engineers and the American Society of Civil Engineers, employing seismic reinforcement measures due to proximity to the San Andreas Fault and Newport–Inglewood Fault. Mechanical systems at the facility integrate pumps, valve houses, and telemetry compatible with the California Energy Commission reliability criteria, while electrical supply coordination occurs with Southern California Edison and municipal grid assets.

Water Sources and Management

Water feeding the reservoir derives from a mix of imported supplies via the California State Water Project and the Los Angeles Aqueduct, treated local runoff from the Los Angeles River watershed, and operational transfers within the Metropolitan Water District of Southern California network. Management follows operational plans aligned with the California Department of Water Resources hydrologic forecasts and is subject to regulatory oversight by the State Water Resources Control Board. Water quality monitoring employs laboratories that follow standards from the United States Environmental Protection Agency and the California Office of Environmental Health Hazard Assessment for constituent analysis and public health protection coordinated with the Los Angeles County Department of Public Health.

Environmental and Recreational Aspects

The reservoir sits within an urban ecological matrix involving habitat connectivity with riparian corridors and urban green spaces such as nearby parks managed by the Los Angeles Recreation and Parks Department. Biodiversity assessments have considered migratory bird use protected under the Migratory Bird Treaty Act and state species listings administered by the California Department of Fish and Wildlife. Recreational policy has been shaped by civic groups and nonprofit stakeholders including the Trust for Public Land and local neighborhood councils who have engaged with the Los Angeles Conservancy on landscape and access proposals. Waterfowl management, vegetation restoration, and invasive species control coordinate with the U.S. Fish and Wildlife Service where federal concerns apply.

Safety and Flood Control

Flood risk reduction around the reservoir follows design guidelines from the Federal Emergency Management Agency floodplain mapping and coordination with the Los Angeles County Flood Control District. Seismic safety retrofits reference publications from the National Earthquake Hazards Reduction Program and engineering standards promulgated by the American Concrete Institute. Emergency response planning involves the Los Angeles Emergency Management Department, mutual aid from neighboring jurisdictions such as Long Beach, California and Pasadena, California, and continuity planning with the California Governor’s Office of Emergency Services.

Future Plans and Projects

Planned initiatives include modernization projects aligned with state resilience programs led by the California Strategic Growth Council and funding applications to the California Infrastructure and Economic Development Bank and federal programs administered by the United States Department of the Interior. Proposed upgrades focus on seismic resilience, water quality treatment enhancements in concert with State Water Resources Control Board initiatives, habitat restoration in partnership with the Riverside-Corona Resource Conservation District, and expanded public access shaped through community engagement involving the Los Angeles City Council and neighborhood councils. Long-term adaptation planning references climate projections from the California Climate Change Assessment and regional water supply scenarios developed by the Metropolitan Water District of Southern California.

Category:Reservoirs in Los Angeles County, California