Martis Creek Dam, also known as Martis Creek Lake, is a federal-owned structure located in Nevada County, California. Completed in 1972, this earth dam serves primarily for flood risk reduction but also supports hydroelectric power generation and recreational activities. Standing at 93 feet tall with a hydraulic height of 108 feet, the dam has a storage capacity of 22,000 acre-feet and a maximum discharge of 4,060 cubic feet per second.

Despite a history of water seepage issues, Martis Creek Dam has undergone significant modifications to improve its performance and reduce risks. Recent risk assessments have categorized the dam as having a moderate risk level, with measures in place to prevent water seepage and overtopping. The US Army Corps of Engineers (USACE) actively manages the dam, working with local emergency managers, updating emergency action plans, and conducting regular maintenance and inspections to ensure public safety. While concerns remain about potential dam failure scenarios, the implementation of risk reduction measures and emergency preparedness plans help mitigate these risks and protect downstream communities.