Rossmoor No. 1 is a hydroelectric dam located in Newport Beach, California, along the Tr San Diego Cr river. Built in 1964, this Earth-type dam stands at a height of 36 feet and has a storage capacity of 43 acre-feet. Its primary purpose is hydroelectric power generation, with additional functions for irrigation and water supply. The dam is state-regulated and inspected, with enforcement measures in place to ensure its safety and compliance with regulations.

Despite its satisfactory condition assessment, Rossmoor No. 1 has a high hazard potential, requiring regular inspections and emergency preparedness measures. The dam's last inspection was conducted in December 2019, with a frequency of once per year. In the event of an emergency, it is crucial to have updated emergency action plans to mitigate risks and protect downstream communities. With its strategic location and vital role in water resource management, Rossmoor No. 1 serves as a key infrastructure for sustainable development and climate resilience in the region.