Declez Retention in Riverside, California, is a local government-owned structure designed for flood risk reduction along the Tr San Sevaine Creek. Completed in 1984, this earth dam stands at a height of 30 feet with a hydraulic height of 23 feet, providing a storage capacity of 331 acre-feet. The dam has a length of 1500 feet and a surface area of 21 acres, serving as a crucial infrastructure for water resource management in the region.

With a high hazard potential, Declez Retention undergoes regular inspections to ensure its structural integrity. The last assessment in September 2017 deemed its condition as satisfactory, with a hazard potential rating of high. The Emergency Action Plan (EAP) for the dam was last reviewed in October 2019, highlighting the importance of preparedness and risk management measures in case of emergencies. Mark Takano, a Congressman representing the area, is involved in overseeing the safety and regulatory aspects of the dam.

As a vital component in the flood risk reduction strategy for Glen Avon Heights, Declez Retention plays a crucial role in safeguarding the community from potential disasters. Its strategic location and design make it an essential asset for water resource management and climate resilience efforts in the region, underlining the importance of proactive maintenance and adherence to safety protocols to ensure its continued effectiveness in mitigating flood risks.