Frd No 20, also known as Little Walnut Hickory WS Dam 20, is a local government-owned structure in Leon, Kansas, designed by USDA NRCS with a primary purpose of flood risk reduction. Completed in 1965, this earth dam stands at a height of 25 feet and has a length of 1800 feet, providing a normal storage capacity of 115.78 acre-feet and serving a drainage area of 4.37 square miles. The dam has a low hazard potential and is currently not rated for condition assessment.

Located on the South Branch of the Little Walnut River, Frd No 20 is regulated by the Kansas Department of Agriculture and falls under the jurisdiction of the state, with permitting, inspection, and enforcement processes in place. The dam features an uncontrolled spillway with a width of 70 feet and has no associated locks or outlet gates. While the risk assessment for the structure is moderate, there are currently no risk management measures or emergency action plans in place, highlighting the need for continued monitoring and preparedness in the face of potential hazards.

Overall, Frd No 20 serves as a critical infrastructure for flood risk reduction in Butler County, Kansas, offering protection to the surrounding areas and contributing to water resource management in the region. With its historical significance and ongoing regulatory oversight, this earth dam stands as a testament to the importance of maintaining and assessing our water infrastructure for the resilience of communities and the environment in the face of changing climate conditions.