Manhattan Creek, located in Garden Valley, El Dorado County, California, is a privately owned dam that serves as a crucial water supply source. Built in 1952, this earth dam stands at 32 feet high with a storage capacity of 110 acre-feet. The dam's primary purpose is for irrigation, recreation, and water supply, making it a vital resource for the surrounding community.

Managed by the Natural Resources Conservation Service, Manhattan Creek has a high hazard potential but is currently in satisfactory condition according to a 2017 assessment. The dam is regulated by the California Department of Water Resources and undergoes regular inspections to ensure its safety and functionality. Despite its age, Manhattan Creek continues to provide essential water resources to the area, demonstrating its importance in water management and climate resilience efforts.

With a drainage area of 1.33 square miles and a surface area of 10 acres, Manhattan Creek plays a significant role in managing water flow and storage in the region. Its location within the San Francisco District and under the jurisdiction of the state of California highlights its importance in the larger water management system. As climate change impacts water resources, dams like Manhattan Creek become increasingly vital for ensuring water security and sustainability in the face of changing environmental conditions.