Located in Rossmoor, California, the Rossmoor Retarding Basin is a crucial piece of infrastructure designed for flood risk reduction along the Los Alamitos Channel. Completed in 2002, this earth dam stands at 14 feet in height and has a storage capacity of 175 acre-feet. With a low hazard potential and a satisfactory condition assessment as of 2017, the basin plays a key role in protecting the surrounding area from potential flooding events.

Managed by local government authorities and regulated by the Department of Water Resources (DWR) and Safety of Dams, the Rossmoor Retarding Basin undergoes regular inspections to ensure its structural integrity and functionality. Situated within the Orange County jurisdiction, this basin serves as a vital component of the region's water resource management strategy. The dam's primary purpose is to mitigate flood risks, highlighting its importance in safeguarding the community against water-related disasters.

With a maximum discharge capacity and a surface area of 25 acres, the Rossmoor Retarding Basin is a significant asset in the area's water infrastructure. As climate change impacts continue to pose challenges to water resources, the effective management and maintenance of structures like this basin are essential in mitigating flood risks and ensuring the safety of residents in Rossmoor and beyond.