Rancho Seco, located in Herald, California, is a public utility dam on Tr Hadselville Cr, managed and regulated by the Department of Water Resources and the Safety of Dams agency. Completed in 1972, this earth dam stands at a height of 58 feet and has a hydraulic height of 50.5 feet, with a total length of 3400 feet and a storage capacity of 2950 acre-feet. The dam serves primarily for tailings storage, with secondary purposes including recreation. Despite its high hazard potential, Rancho Seco has been assessed as being in satisfactory condition as of September 2017.

The dam's surrounding area covers 165 acres and drains an area of 1.8 square miles. The last inspection in November 2020 found the structure to be in good condition, with regular inspections conducted every 1 year. Rancho Seco's Emergency Action Plan was last revised in August 2020, ensuring that necessary measures are in place in case of emergencies. The dam is under the jurisdiction of the state of California and is subject to state permitting, inspection, and enforcement protocols to maintain its safety and functionality, making it an essential component in water resource management and climate resilience efforts in the region.