Frd No 20, also known as Rock Creek Watershed Dam 20, is a crucial infrastructure project located in Butler County, Kansas. Owned by the local government and designed by USDA NRCS, this earth dam stands at a height of 33 feet and was completed in 1966 for the primary purpose of flood risk reduction. With a normal storage capacity of 27 acre-feet and a drainage area of 1.25 square miles, the dam plays a significant role in managing water resources in the area.

Managed by the Kansas Department of Agriculture, Frd No 20 is regulated, inspected, and enforced by state authorities to ensure its structural integrity and overall safety. The dam's low hazard potential and moderate risk assessment make it a key component of the Rock Creek watershed's flood control system. Despite not being rated for its condition, the dam's emergency action plan and risk management measures are essential for mitigating potential risks and ensuring the safety of nearby communities in Winfield, Kansas.

With a spillway width of 40 feet and an uncontrolled spillway type, Frd No 20 has a maximum storage capacity of 598.47 acre-feet and a surface area of 7.98 acres. While it does not have outlet gates or associated structures, the dam's strategic location and design make it a critical asset for water resource management and climate resilience efforts in the region.