Dd No H-21 is a local government-owned earth dam located in Lane, Kansas, along the Pottawatomie Creek-TR. Completed in 1985, this dam serves primarily for flood risk reduction purposes and has a height of 37.6 feet and a length of 610 feet. With a storage capacity of 498 acre-feet, Dd No H-21 has a moderate hazard potential and is currently rated as "Not Rated" in terms of condition assessment.

Managed by the Kansas Department of Agriculture, this dam is regulated, permitted, inspected, and enforced by state authorities. The primary designer of Dd No H-21 is the USDA NRCS, with oversight from the Natural Resources Conservation Service. The dam features an uncontrolled spillway type with a width of 40 feet and a surface area of 12.9 acres, serving a drainage area of 1.28 square miles. Despite its low hazard potential, the dam's risk assessment categorizes it as moderate, indicating the need for ongoing risk management measures.

Although Dd No H-21 does not have a designated Emergency Action Plan (EAP) or inundation maps prepared, it meets state guidelines and is subject to regular monitoring and maintenance. With its strategic location and crucial role in flood risk reduction for the local community, this dam stands as a vital infrastructure for water resource management and climate resilience in Anderson County, Kansas.