San Dimas, also known as San Dimas Reservoir, is a gravity dam located in La Verne, California, that serves as a crucial flood risk reduction structure along the San Dimas Creek. Completed in 1922, this dam stands at a height of 131 feet and has a storage capacity of 1,534 acre-feet, providing essential water supply for irrigation and other purposes. Managed by the local government, the dam is regulated and inspected by the Department of Water Resources (DWR) for safety and enforcement.

With a high hazard potential but a satisfactory condition assessment as of September 2017, San Dimas Dam undergoes regular inspections to ensure its continued functionality and structural integrity. It is equipped with emergency action plans and updated contact information to handle any potential risks or emergencies effectively. The surrounding area, covering a surface area of 36 acres and draining 15.9 square miles, benefits from the flood risk reduction provided by this vital infrastructure.

San Dimas Dam not only plays a significant role in flood risk reduction but also contributes to irrigation and water supply in the region. Its historical significance, dating back nearly a century, underscores the importance of maintaining and monitoring this structure to safeguard the local community and water resources in Los Angeles County, California.