Located in Rush County, Kansas, Frd No 20 is a local government-owned earth dam designed by the USDA NRCS for flood risk reduction along Walnut Creek-TR. Completed in 1983, this dam stands at a height of 34.7 feet with a length of 1440 feet, providing a normal storage capacity of 116 acre-feet and a maximum discharge of 5866 cubic feet per second. Despite its satisfactory condition assessment, the dam poses a high hazard potential and is subject to regular state inspection, permitting, and enforcement by the Kansas Department of Agriculture.

With a spillway width of 200 feet and uncontrolled spillway type, Frd No 20 has a moderate risk assessment rating of 3. The dam's purpose solely focuses on flood risk reduction, serving as a crucial infrastructure for water resource management in the area. Although no emergency action plan or inundation maps have been prepared, the dam's satisfactory condition and regular inspection frequency of 3 years ensure its operational safety and effectiveness. Managed by the Natural Resources Conservation Service, Frd No 20 remains a vital component in mitigating flood risks along Walnut Creek-TR and safeguarding the surrounding communities in Alexander, Kansas.