Frd No 21, also known as the Big Caney Watershed Dam 21, is a crucial water resource structure located in Cedarvale, Kansas. Owned by the local government, this dam is designed to reduce flood risks in the area and is regulated by the Kansas Department of Agriculture. Completed in 1967, Frd No 21 has a height of 46 feet and a hydraulic height of 43 feet, with a capacity to store up to 2230 acre-feet of water from the Turkey Creek.

The dam's core type is buttress, and it spans a length of 1570 feet with a spillway width of 150 feet. Despite its low hazard potential, Frd No 21 has not been rated for condition assessment, and its emergency action plan status remains unknown. With its primary purpose being flood risk reduction, this dam plays a vital role in protecting the surrounding Chautauqua County from potential water-related disasters. Water resource and climate enthusiasts will find Frd No 21 to be an essential infrastructure that safeguards the community against flooding events.