San Antonio Dam, also known as San Antonio Reservoir, is a Federal-owned structure located in Claremont, California. Built in 1956 by CESPL, this Earth-type dam stands at a height of 160 feet and spans 3850 feet across San Antonio Creek. With a storage capacity of 11,880 acre-feet, the dam primarily serves the purpose of flood risk reduction along with a maximum discharge capacity of 53,700 cubic feet per second.

Managed by the US Army Corps of Engineers, San Antonio Dam is considered to have a high hazard potential and undergoes regular inspections and risk assessments to ensure its structural integrity. The dam is equipped with an uncontrolled spillway and vertical lift outlet gates to manage water levels and mitigate flood risks effectively. The risk management measures implemented by USACE include continual monitoring, prioritizing activities to reduce risks, and engaging with emergency managers and the public to raise awareness and preparedness for potential dam-related emergencies.

In the face of severe weather events and changing water levels, San Antonio Dam remains a critical structure for flood control in the region. Through proactive risk management strategies and ongoing maintenance efforts, USACE is dedicated to ensuring the safety and functionality of the dam to protect surrounding communities and water resources.