Frd No 40, located in Ness County, Kansas, is a local government-owned earth dam designed by the USDA NRCS in 1990 for flood risk reduction along Walnut Creek. With a height of 25.6 feet and a length of 3075 feet, the dam provides a storage capacity of 1898 acre-feet, serving its primary purpose effectively. Despite being uncontrolled, the spillway with a width of 60 feet can handle a maximum discharge of 1307 cubic feet per second.

This dam, with a hazard potential rated as low and a moderate risk assessment score of 3, is regulated by the Kansas Department of Agriculture. Although the condition assessment is currently not rated, the dam has not been modified over the years. While there are no outlet gates, the dam's emergency action plan status is unknown. Overall, Frd No 40 stands as a crucial structure in the region for flood risk mitigation, highlighting the importance of maintaining its safety and functionality for water resource and climate enthusiasts.