San Joaquin Reservoir, located in Newport Beach, California, is a vital water supply resource managed by a public utility. The reservoir, completed in 1966, stands at a height of 224 feet and has a storage capacity of 3036 acre-feet. Situated on Tr Bonita Creek, it serves the primary purpose of providing water to the surrounding area, with a drainage area of 0.35 square miles.

With a surface area of 50 acres, San Joaquin Reservoir is regulated and inspected by the California Department of Water Resources for safety and compliance. Despite its high hazard potential, the dam is currently rated as satisfactory in condition, last assessed in September 2017. The Emergency Action Plan (EAP) for the reservoir was last revised in February 2021, ensuring preparedness and response in case of emergencies.

Managed by the Los Angeles District of the US Army Corps of Engineers, San Joaquin Reservoir plays a crucial role in water resource management in Orange County. Its strategic location and functional design make it a key component in the region's water supply infrastructure, contributing to the sustainability and resilience of the local water system.