Dd No 9 is a dam located in Hessdale, Kansas, along the East Branch Mill Creek. Built in 2001, this earth dam stands at a height of 39.8 feet and has a storage capacity of 639 acre-feet. Its primary purpose is flood risk reduction, serving as a vital infrastructure for protecting the surrounding area from potential flooding events.

Managed by the Kansas Department of Agriculture, Dd No 9 is classified as a low hazard potential dam with a moderate risk assessment rating. Despite not being rated for condition assessment, this structure plays a crucial role in regulating water flow and managing the drainage area of 3.34 square miles. In the event of emergency, the dam has an uncontrolled spillway with a width of 175 feet to ensure controlled water release.

With its strategic location and design, Dd No 9 exemplifies the importance of effective water resource management in mitigating flood risks in Wabaunsee County, Kansas. As climate change continues to impact weather patterns, structures like Dd No 9 will be essential in safeguarding communities and infrastructure against the threats of flooding and water-related disasters.