Big Dalton Reservoir, located in Glendora, California, is a vital water resource managed by the local government for flood risk reduction and water supply purposes. Built in 1929, this multi-arch dam stands at a height of 153 feet with a storage capacity of 1290 acre-feet. The reservoir's primary source, Big Dalton Wash, serves a drainage area of 4.3 square miles and covers a surface area of 26 acres.

With a high hazard potential but a satisfactory condition assessment as of September 2017, Big Dalton Reservoir undergoes regular inspections to ensure its safety and functionality. The dam's last inspection in November 2020 affirmed its structural integrity, meeting regulatory standards set by the California Department of Water Resources and Safety of Dams. In case of emergencies, the reservoir is equipped with emergency action plans, although further details on their preparation and implementation are not specified in the available data.

Water resource and climate enthusiasts fascinated by the engineering marvels of dams and reservoirs will find Big Dalton an intriguing case study in flood risk management and water storage in the Los Angeles area. Its location in a densely populated region underlines the importance of maintaining and monitoring such critical infrastructure to safeguard communities and ecosystems against potential hazards and ensure a sustainable water supply for future generations.