Castle is a dam located in Merced, California, with a primary purpose of flood risk reduction along Canal Creek. Built in 1991, this earth dam stands at a height of 40 feet and spans a length of 2027 feet, providing a storage capacity of 7510 acre-feet. With a high hazard potential, Castle has been regulated and inspected by the California Department of Water Resources for safety and enforcement.

The dam's condition was last assessed as satisfactory in September 2017, with regular inspections taking place every year. Despite its high hazard potential, Castle has been deemed to meet safety guidelines and has emergency action plans in place. The dam's location in Castle Afb, under the jurisdiction of the San Francisco District, further underscores its importance in protecting the surrounding area from potential flooding risks.

Castle serves as a vital infrastructure for flood risk reduction in the region, showcasing the collaborative efforts of local government agencies to ensure the safety and security of residents and businesses. As climate change continues to impact water resources, dams like Castle play a crucial role in mitigating potential disasters and safeguarding communities against the threats of extreme weather events. Its strategic location and design make Castle a key asset in the management of water resources and climate resilience efforts in California.