Frd No 4, also known as Rock Creek Watershed Dam 4, is a vital structure in Cowley, Kansas, designed by the USDA NRCS to reduce flood risks in the area. Completed in 1970, this earth dam stands at a height of 44 feet and has a normal storage capacity of 201 acre-feet, serving the primary purpose of flood risk reduction along the Durham Creek.

Located in Winfield, Kansas, Frd No 4 has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Despite its moderate risk level, the dam has not been inspected in recent years and lacks updated emergency action plans. With a spillway width of 40 feet and a drainage area of 6.56 square miles, this dam plays a crucial role in managing water resources in the region.

Although Frd No 4 meets state regulatory standards and is under the jurisdiction of the Kansas Department of Agriculture, its risk assessment remains at a moderate level. With its controlled spillway and strategic design by the Natural Resources Conservation Service, this dam continues to be a key asset in protecting the surrounding area from potential flooding events.