Frd No 13 (Site 7-21), also known as Lyon Creek WS Joint District No 41, is a flood risk reduction dam located in Lyona, Kansas. Owned by the local government and designed by USDA NRCS, this dam serves the primary purpose of mitigating flood risks in the area. With a dam height of 44 feet and a storage capacity of 560 acre-feet, Frd No 13 plays a crucial role in protecting the community from potential flooding events.

Situated on Lyon Creek-TR in Dickinson County, Kansas, Frd No 13 is regulated by the Kansas Department of Agriculture and undergoes state permitting, inspection, and enforcement. The dam, constructed with an earth core and buttress type, spans a length of 1610 feet and covers a surface area of 10.6 acres. With a low hazard potential and a moderate risk assessment rating, Frd No 13 is considered a vital infrastructure for water resource management in the region.

Although the dam's condition is currently not rated, Frd No 13 is an essential component of the flood control system in Lyona, Kansas. With its strategic location and design, this dam ensures the safety and well-being of the local community by reducing the risk of flooding and safeguarding the surrounding area from potential water-related disasters.