Frd No 21, also known as Rock Creek Watershed Dam 21, is a local government-owned earth dam located in Butler County, Kansas. Built in 1966 by the USDA NRCS, this dam serves as a crucial structure for flood risk reduction in the Rock Creek-TR watershed. With a dam height of 34 feet and a storage capacity of 481.4 acre-feet, Frd No 21 plays a key role in protecting the surrounding area from potential flooding events.

Managed by the Kansas Department of Agriculture, Frd No 21 is regulated, permitted, inspected, and enforced by the state to ensure its structural integrity and overall safety. The dam, with a spillway width of 40 feet and an uncontrolled spillway type, has a low hazard potential and is currently rated as not assessed in terms of condition. Despite its moderate risk assessment, Frd No 21 continues to be a vital infrastructure for flood control and water resource management in the region.

As an essential component of the local watershed system, Frd No 21 contributes to the overall resilience of the area against flooding risks. With its primary purpose of flood risk reduction, this earth dam stands as a testament to effective water resource management and climate adaptation strategies. The ongoing monitoring and maintenance of Frd No 21 highlight the commitment to safeguarding communities and natural ecosystems from the impacts of extreme weather events.