Marsh Creek, also known as Marsh Creek Reservoir, is a local government-owned dam located in Brentwood, California. Constructed in 1963 by the USDA NRCS, this earth-type dam stands at a height of 59 feet and serves the primary purpose of flood risk reduction along the Marsh Creek river. With a storage capacity of 4,425 acre-feet and a surface area of 335 acres, Marsh Creek plays a crucial role in managing water resources in Contra Costa County.

Managed by the California Department of Water Resources and subject to state regulations, Marsh Creek Dam has a high hazard potential but is currently assessed as satisfactory in condition. The dam underwent its last inspection in October 2020, with a recommended inspection frequency of once a year. In the event of an emergency, the dam is equipped with an Emergency Action Plan (EAP) to ensure swift and effective response measures.

Located within the San Francisco District of the US Army Corps of Engineers, Marsh Creek Dam is a vital infrastructure ensuring the safety and resilience of the surrounding community in the face of potential flood events. Climate and water resource enthusiasts will find Marsh Creek an intriguing case study in dam management and the intersection of technology, policy, and environmental stewardship in safeguarding our waterways.