Frd No 20, also known as Little Delaware Mission Cr WS Dam 20, is a local government-owned structure located in Horton, Kansas. Built in 1969 by the USDA NRCS, this earth dam stands at a height of 31 feet and serves the primary purpose of flood risk reduction along Otter Creek. With a storage capacity of 337.73 acre-feet and a normal storage level of 48 acre-feet, Frd No 20 covers a surface area of 9.05 acres and has a drainage area of 0.56 square miles.

Managed by the Kansas Department of Agriculture, Frd No 20 has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. The dam features an uncontrolled spillway with a width of 80 feet and has not been modified since its completion. While the risk assessment for Frd No 20 is moderate, there is no Emergency Action Plan (EAP) in place, and the structure has not been inspected recently. Despite these challenges, the dam continues to play a crucial role in mitigating flood risks in the area and protecting downstream communities.