Located in Lincoln, Kansas, Frd No 21, also known as Spillman Creek Watershed Dam 21, is a Local Government-owned structure designed by USDA NRCS for flood risk reduction. Built in 1974, this earth-type dam stands at 27 feet tall, with a hydraulic height of 24 feet and a length of 970 feet. With a storage capacity of 321.53 acre-feet and a normal storage level of 44 feet, this dam serves the primary purpose of mitigating flood risks in the area.

Situated on Little Timber Creek-TR, Frd No 21 is regulated by the Kansas Department of Agriculture and undergoes regular inspections to ensure its structural integrity and continued functionality. The dam has a low hazard potential and a moderate risk assessment, making it vital for maintaining the safety and security of the surrounding community. Despite not having a current condition assessment, this dam plays a crucial role in water resource management in the region.

With its uncontrolled spillway type and a spillway width of 50 feet, Frd No 21 is equipped to handle potential overflow events effectively. While there are no outlet gates associated with this structure, its presence helps to safeguard against flooding and offers a crucial line of defense against water-related disasters. As climate change continues to impact water resources, structures like Frd No 21 become increasingly essential for ensuring the resilience and sustainability of water management systems in the face of evolving environmental challenges.