Dd No Sp-3 is a local government-owned dam located in Potwin, Kansas, designed by Gene Bohnenblast. Completed in 1987, this earth dam stands at a height of 18.2 feet and spans a length of 2100 feet. With a primary purpose of flood risk reduction, Dd No Sp-3 has a normal storage capacity of 6 acre-feet and a maximum storage capacity of 375 acre-feet. The dam is situated on Diamond Creek-TR, within the Kansas City District, and is regulated by the Kansas Department of Agriculture.

This dam has a low hazard potential and is currently rated as "Not Rated" in terms of its condition assessment. While the risk assessment for Dd No Sp-3 is moderate, with a score of 3, there are no specific risk management measures or emergency action plans in place as of the last update in July 2018. The dam features an uncontrolled spillway with a width of 50 feet, and no outlet gates or associated structures. Despite its relatively low hazard potential, this dam plays a crucial role in mitigating flood risks in the area.

Water resource and climate enthusiasts will appreciate the vital role that Dd No Sp-3 plays in flood risk reduction in Butler County, Kansas. With its strategic location on Diamond Creek-TR and a moderate risk assessment score, this earth dam serves as a key infrastructure for managing water flow and protecting the surrounding communities from potential flooding events. Continued monitoring and maintenance of Dd No Sp-3 will be essential to ensure its effectiveness in safeguarding the area from water-related risks in the years to come.