Buchanan Dam, also known as H.V. Eastman Lake, is a rockfill dam located in Chowchilla, California, along the Chowchilla River. Completed in 1975 by the US Army Corps of Engineers, the primary purpose of the dam is flood risk reduction, with additional benefits including hydroelectric power generation, irrigation, and recreation. Standing at a structural height of 218 feet and with a storage capacity of 185,256 acre-feet, Buchanan Dam plays a crucial role in managing water levels and mitigating flood risks in the region.

With a hazard potential rated as high, the dam is regularly inspected and maintained by the US Army Corps of Engineers to ensure its structural integrity and safety. Risk management measures include continual monitoring, prioritizing activities to address risks, and engaging with local emergency managers and the public to raise awareness and readiness for potential dam-related emergencies. The dam's emergency action plan is regularly updated, and maintenance and repairs are conducted as needed to keep the dam functioning properly. Despite the risks associated with severe weather events and potential dam releases, Buchanan Dam plays a vital role in managing water resources and protecting downstream communities from flooding.