Harlan County Dam, also known as Harlan County Lake, is a gravity-type dam located in Naponee, Nebraska on the Republican River. Completed in 1952 by the US Army Corps of Engineers, the dam serves the primary purpose of flood risk reduction while also supporting fish and wildlife habitats, irrigation, recreation, and water supply. With a hydraulic height of 105 feet and a structural height of 107 feet, the dam has a storage capacity of 825,700 acre-feet and covers a surface area of 13,600 acres.

The dam's spillway, with a controlled design and width of 856 feet, helps manage water levels during high flow events. Despite being classified with a high hazard potential, the dam is regularly inspected, and emergency action plans are in place to address any safety concerns. The USACE implements risk management measures to monitor the dam's condition, prioritize maintenance activities, and collaborate with local emergency managers to ensure preparedness for potential emergencies. As a vital infrastructure for flood protection in the region, Harlan County Dam plays a crucial role in safeguarding communities and ecosystems against the risks associated with severe weather events and water management challenges.

Overall, Harlan County Dam stands as a critical asset in the effort to mitigate flood risks and ensure water resource sustainability in the area. With ongoing monitoring and proactive risk management strategies in place, the dam continues to be a key component in the region's resilience against potential threats, highlighting the importance of effective dam infrastructure management in maintaining the safety and well-being of surrounding communities and environments.