Located in Rancho Bernardo, California, Bernardo Reservoir is a vital offstream water supply source with a capacity of 30 acre-feet. Built in 1964, this earth dam stands at a height of 54 feet and spans 830 feet in length. The reservoir's primary purpose is to provide water supply to the local community, making it a crucial asset for water resource management in the region.

Managed by the local government and regulated by the Department of Water Resources (DWR) for safety compliance, Bernardo Reservoir has a high hazard potential but is currently assessed to be in satisfactory condition. Regular inspections ensure the structural integrity of the dam, with the last assessment conducted in September 2017. With its location in San Diego County and proximity to the Los Angeles District, the reservoir plays a crucial role in ensuring water security for the surrounding area.

Despite its modest surface area of 2 acres, Bernardo Reservoir serves as a key water source for Rancho Bernardo and underscores the importance of sustainable water management practices in the face of climate change. By providing a reliable water supply and adhering to strict regulatory standards, this reservoir exemplifies the vital role of infrastructure in supporting water resource resilience in a changing climate.