Dd No H-4, located in Lane, Kansas, is a local government-owned dam designed by the USDA NRCS for flood risk reduction on the Hahn Branch Pottawatomie Creek. Completed in 1986, this earth dam stands at a height of 30 feet and stretches 1207 feet in length, providing a storage capacity of 333.6 acre-feet. The dam's primary purpose is flood risk reduction, with a low hazard potential and a moderate risk assessment rating.

Managed by the Kansas Department of Agriculture, Dd No H-4 is regulated, permitted, inspected, and enforced by state agencies, ensuring the safety and functionality of the structure. Despite being uncontrolled, the dam features a spillway width of 40 feet to handle a maximum discharge of 1231 cubic feet per second. With a surface area of 10.3 acres and a drainage area of 0.72 square miles, this dam plays a crucial role in mitigating flood risks in the area, showcasing effective water resource management practices in place to protect the local community and environment.