Frd No 21, located in Cassoday, Kansas, is a key flood risk reduction structure designed by the USDA NRCS and completed in 1981. This earth dam stands at 27 feet in height and spans 3000 feet, providing vital protection to the surrounding area from potential flooding events. With a storage capacity of 1260 acre-feet and a surface area of 41.7 acres, Frd No 21 plays a crucial role in managing water resources in the region.

Managed by the local government and regulated by the Kansas Dept. of Agriculture, Frd No 21 is classified as having a high hazard potential due to its function in flood risk reduction. While the condition assessment is currently not rated, regular inspections are conducted every 3 years to ensure the structure's integrity and safety. The dam includes a spillway width of 200 feet, though details on the spillway type are not specified, emphasizing the importance of ongoing monitoring and maintenance to mitigate any potential risks associated with its operation.

Overall, Frd No 21 serves as a vital infrastructure project in Butler County, Kansas, contributing to the protection of nearby communities from the impacts of flooding. As climate change continues to pose challenges to water resource management, structures like Frd No 21 play a crucial role in enhancing resilience and reducing the risks associated with extreme weather events. With its strategic location along the Cole Creek-Tr river/stream, Frd No 21 stands as a testament to effective collaboration between federal and state agencies in safeguarding the local area from potential water-related disasters.