Lower Blackwelder, also known as Lower Blackwelder Lake, is a federal-owned dam situated in Yuba County, California, near the city of Beale AFB. Managed by the US Air Force, this dam primarily serves the purpose of flood risk reduction while also providing recreational opportunities. The dam is a rockfill type with a height of 10 feet and a length of 700 feet, offering a storage capacity of 160 acre-feet and covering a surface area of 20 acres.

Located on Hutchinson Creek, Lower Blackwelder has a low hazard potential and a moderate risk assessment rating. Despite its age and limited data on condition assessment, the dam is inspected every 5 years to ensure its structural integrity and overall safety. While the dam does not have an Emergency Action Plan (EAP) in place, it meets regulatory guidelines and is equipped with an uncontrolled spillway with a width of 35 feet to manage potential overflow. Overall, Lower Blackwelder plays a crucial role in flood risk management in the area, showcasing the importance of water resource infrastructure in mitigating climate-related risks.