Dd No Sp-11 is a local government-owned dam located in Towanda, Kansas, along the Rock Creek river. Completed in 1996, this earth dam stands at 27 feet high and spans a length of 2213 feet, providing flood risk reduction and debris control for the surrounding area. With a storage capacity of 1703.2 acre-feet and a normal storage level of 93.1 acre-feet, the dam covers a surface area of 30.3 acres and drains a 3.64 square mile watershed.

Managed by the Kansas Department of Agriculture, Dd No Sp-11 has a low hazard potential and a moderate risk assessment rating. Although the dam has not been rated for its condition, it is inspected regularly by state agencies and operates with uncontrolled spillways. Despite being non-USACE managed, the dam plays a crucial role in mitigating flood risks in the region, with a maximum discharge capacity of 2883 cubic feet per second.

In summary, Dd No Sp-11 serves as an essential infrastructure for flood risk reduction in Butler County, Kansas. With its strategic location along Rock Creek, this earth dam continues to play a vital role in protecting the local community from potential flooding events. As a state-regulated structure with a moderate risk assessment, Dd No Sp-11 highlights the importance of proactive water resource management in mitigating climate-related disasters.