Located in Perry, Kansas, Frd No 3, also known as Thompsonville Watershed Dam 3, is a vital structure owned by the local government. Designed by USDA NRCS, this earth-type dam stands at a height of 30 feet and serves the primary purpose of flood risk reduction along the Delaware River. Completed in 1960, it has a maximum storage capacity of 103 acre-feet and a normal storage of 14 acre-feet, covering a surface area of 3 acres and draining a 0.24 square mile watershed area.

With a hazard potential rated as high and a fair condition assessment, Frd No 3 is subject to regular inspections by the Kansas Department of Agriculture to ensure its structural integrity. The dam has a spillway width of 30 feet and a maximum discharge capacity of 822 cubic feet per second. While it does not have any associated locks or outlet gates, the dam plays a crucial role in mitigating flood risks in the region. Despite its moderate risk assessment, efforts are being made to continuously monitor and manage the dam's safety to protect the surrounding community and environment.