Dutch Flat Afterbay, located in Nevada County, California, is a rockfill dam completed in 1965 with a primary purpose of irrigation. With a height of 165 feet and a storage capacity of 2037 acre-feet, this dam plays a crucial role in providing water for agricultural purposes in the region. The dam is regulated by the Federal Energy Regulatory Commission and inspected by the same agency to ensure its safe operation.

The Dutch Flat Afterbay dam has a low hazard potential and a moderate risk assessment, indicating that it is well-maintained and poses minimal threat to surrounding areas. The spillway of the dam is uncontrolled with a width of 100 feet, allowing for the controlled release of excess water during periods of high flow. The dam is also equipped with emergency action plans to ensure preparedness in case of any unforeseen events.

Overall, Dutch Flat Afterbay serves as a vital water resource infrastructure in the region, supporting irrigation, hydroelectric power generation, and water supply needs. Its design by Ebasco Services, Inc. and regulation by state and federal agencies demonstrate the commitment to maintaining the safety and reliability of this important water management structure for the benefit of the community.