Frd No 4 is a crucial local government-owned earth dam located in Rush County, Kansas, designed by A&E and SCS. Completed in 1988, this dam serves the primary purpose of flood risk reduction along the Walnut River. Standing at a height of 29.8 feet and with a length of 3203 feet, Frd No 4 has a storage capacity of 2999 acre-feet and covers a surface area of 67 acres.

With a drainage area of 12.34 square miles, Frd No 4 has a low hazard potential and is classified as having a moderate risk level. The dam features an uncontrolled spillway with a width of 400 feet and has not been rated for its current condition. While it has not undergone a recent inspection, the state of Kansas actively regulates, inspects, and enforces safety measures for this structure, ensuring its continued effectiveness in flood risk mitigation. For water resource and climate enthusiasts, Frd No 4 is a significant infrastructure contributing to the resilience of the local area against potential flooding events.