Located in Jackson, Kansas, Gs Dd No D-20 is a local government-owned dam designed by P.E. Wilbur Naylor for flood risk reduction along the North Cedar Creek-TR. Completed in 1994, this earth dam stands at a height of 24.5 feet and spans 500 feet in length, with a storage capacity of 228.5 acre-feet and a drainage area of 0.62 square miles. With a spillway width of 40 feet and a maximum discharge of 1000 cubic feet per second, the dam is classified as having a low hazard potential and a moderate risk assessment rating.

Managed by the Kansas Department of Agriculture, Gs Dd No D-20 serves the primary purposes of debris control and flood risk reduction. Despite not being rated for its condition assessment, the dam is regularly permitted, inspected, and enforced by state regulatory agencies. While it currently does not have an emergency action plan in place, the dam is in compliance with state jurisdiction requirements and stands as a vital infrastructure for protecting the surrounding community from potential flooding events. With its strategic location and design features, Gs Dd No D-20 represents a critical component of water resource management in the region.