Harold Reservoir, also known as Palmdale Lake, is a vital water resource located in Palmdale, California. Managed by a public utility, this reservoir serves as a crucial source of irrigation and water supply in the region. Constructed in 1891, the earth dam stands at a height of 30 feet and has a storage capacity of 3,870 acre-feet. With a surface area of 218 acres and a drainage area of 4.63 square miles, Harold Reservoir plays a significant role in water management for the surrounding area.

The dam's high hazard potential is closely monitored by the Department of Water Resources (DWR) for safety and regulatory compliance. Despite its age, the reservoir's condition assessment remains satisfactory, as of the last inspection in January 2020. The emergency action plan (EAP) for Harold Reservoir is regularly updated to ensure that the reservoir meets safety guidelines and emergency response protocols. With its historical significance dating back over a century, Harold Reservoir continues to be a critical infrastructure supporting water supply and irrigation needs in the region.

Situated within the Los Angeles District, Harold Reservoir's location along the Tr Antelope Val River makes it a vital component of the water supply infrastructure in Southern California. As climate change impacts water resources, reservoirs like Harold play a crucial role in managing water availability and distribution for both agricultural and urban needs. The reservoir's operational efficiency and maintenance standards align with state regulations, ensuring a sustainable water supply for the community. With ongoing efforts to enhance risk assessment and management measures, Harold Reservoir remains a key asset in addressing the challenges of water scarcity and climate variability in the region.