Gs Dd No C-33 (Elk 59) is a flood risk reduction structure located in Circleville, Kansas, along Elk Creek-TR. Built in 1988 by the USDA NRCS, this earth dam stands at a height of 35.1 feet and has a length of 980 feet, providing a storage capacity of 259 acre-feet. With a drainage area of 0.57 square miles, the dam serves the primary purpose of flood risk reduction and is regulated by the Kansas Dept. of Agriculture.

The dam's spillway is uncontrolled with a width of 40 feet, allowing for a maximum discharge of 1689 cubic feet per second. Despite its low hazard potential, the dam is considered to have a moderate risk level (3), though its condition is currently not rated. The structure does not have outlet gates and has not been inspected in recent years, highlighting the need for ongoing monitoring and maintenance to ensure its effectiveness in managing flood events in the region.

Overall, Gs Dd No C-33 (Elk 59) plays a crucial role in mitigating flood risks in Nemaha County, Kansas, and its surrounding areas. As climate change continues to pose challenges to water resources management, maintaining and improving infrastructure like this dam is essential for enhancing community resilience and safeguarding against potential disasters in the future.