Dd No 21-15 is a local government-owned earth dam located in Brown, Kansas, designed for flood risk reduction along Plum Creek. With a height of 30 feet and a length of 990 feet, the dam has a storage capacity of 160.1 acre-feet and covers a surface area of 2.08 acres, serving a drainage area of 0.22 square miles. The dam features an uncontrolled spillway with a width of 66 feet and is categorized as having a low hazard potential.

Managed by the Kansas Department of Agriculture, Dd No 21-15 is subject to state regulation, permitting, inspection, and enforcement. Despite being in a moderate risk category, the dam's condition remains unrated, with no recent inspection or assessment data available. The dam does not have an emergency action plan in place, and there are no inundation maps prepared for potential risk assessment. Overall, Dd No 21-15 serves as a vital infrastructure for flood control in the region, highlighting the importance of ongoing monitoring and maintenance to ensure its continued effectiveness and safety for the community.