Frd No 31, also known as Upper Black Vermillion WS Dam 31, is a vital structure located in Vliets, Kansas, in Marshall County. Built in 1974 by the USDA NRCS, this earth dam stands at a height of 29 feet and serves the primary purpose of flood risk reduction along the Black Vermillion River. With a storage capacity of 206.06 acre-feet and a surface area of 10.22 acres, Frd No 31 plays a crucial role in managing water resources in the region.

Despite being classified as having a low hazard potential, Frd No 31 is considered to have a moderate risk level (3) in terms of its condition and management. The dam features an uncontrolled spillway with a width of 40 feet and no outlet gates. While it has not been inspected recently and its condition remains unrated, Frd No 31 continues to contribute to the overall flood protection and water management efforts in the area. With its strategic location and design, this dam serves as a key asset for local government in safeguarding the community against potential water-related risks and emergencies.

As an essential structure in the Kansas City District, Frd No 31 reflects the collaborative efforts between federal and local agencies to address water resource challenges. The dam's presence underscores the importance of proactive measures in enhancing water infrastructure resilience and adapting to changing climate conditions. Moving forward, continued monitoring and maintenance of Frd No 31 will be crucial to ensure its effectiveness in mitigating flood risks and supporting sustainable water management practices in the region.