Frd No 21, also known as the City of Atchison Dam 21, is a significant flood risk reduction structure located in Atchison, Kansas. This dam, designed by the USDA NRCS, was completed in 1965 and stands at a height of 28.2 feet with a hydraulic height of 32 feet. With a primary purpose of flood risk reduction, Frd No 21 plays a crucial role in protecting the surrounding areas from potential water-related disasters.

Owned by the local government and regulated by the Kansas Department of Agriculture, Frd No 21 is inspected regularly to ensure its structural integrity and functionality. The dam has a normal storage capacity of 11 acre-feet and a maximum storage of 54 acre-feet, serving a drainage area of 0.07 square miles along the White Clay Creek-TR. Despite its significant hazard potential, Frd No 21 has been assessed as satisfactory and continues to meet guidelines for emergency action preparedness.

With a spillway width of 40 feet and no associated locks, Frd No 21 serves as a vital component of the water resource management infrastructure in Atchison County. As climate change increases the frequency and intensity of extreme weather events, the importance of structures like Frd No 21 in mitigating flood risks and protecting communities becomes increasingly apparent.