Wrigley Reservoir, located in Avalon, California, is a privately owned Earth dam completed in 1930 primarily for water supply purposes. With a height of 42 feet and a storage capacity of 62 acre-feet, the reservoir is situated on Haypress Creek and covers an area of 2 acres. Despite its small size, Wrigley Reservoir plays a crucial role in water resource management in the region.

The dam is regulated by the California Department of Water Resources and undergoes regular inspections to ensure its structural integrity. With a significant hazard potential, the dam's condition was last assessed as satisfactory in September 2017. In case of emergencies, an Emergency Action Plan (EAP) may be prepared to address potential risks and ensure the safety of the surrounding community.

Managed by private owners, Wrigley Reservoir serves as a vital water source in Los Angeles County, highlighting the importance of sustainable water resource management in the face of changing climate conditions. As water enthusiasts and climate advocates, it is essential to monitor and support the maintenance and regulation of such reservoirs to safeguard water availability and infrastructure resilience in the region.