Frd No 18, also known as Little Walnut Hickory WS Dam 18, is a vital structure located in Butler, Kansas, owned by the local government and regulated by the Kansas Department of Agriculture. Built in 1966 by the USDA NRCS, this earth dam stands at a height of 28.7 feet and serves the primary purpose of flood risk reduction along the South Branch of the Little Walnut River. With a storage capacity of 510.96 acre-feet and a drainage area of 1.53 square miles, Frd No 18 plays a crucial role in managing water resources in the region.

The dam features an uncontrolled spillway with a width of 40 feet and has a hazard potential rated as significant, with a moderate risk assessment. Despite not having a current condition assessment, Frd No 18 undergoes inspections every five years to ensure its structural integrity and effectiveness in flood control. The dam's location, design, and operational features make it a key component in the water management infrastructure of the area, providing essential protection against potential flooding events and safeguarding the surrounding communities.

As a part of the flood risk reduction system, Frd No 18 stands as a testament to the collaborative efforts between local and state agencies in ensuring the safety and well-being of residents in Butler, Kansas. With its strategic placement and design, this earth dam continues to serve its purpose in mitigating flood risks and managing water resources effectively. The ongoing inspections and monitoring of Frd No 18 demonstrate a commitment to maintaining the dam's functionality and readiness to respond to potential emergencies, highlighting the importance of proactive water resource management in the face of changing climate conditions.