Site 75a is a local government-owned dam located in Pottawatomie, Kansas, designed by King Engineering and completed in 2004 for the primary purpose of flood risk reduction along the Rock Creek-TR river or stream. This Earth-type dam stands at a height of 33 feet and spans a length of 650 feet, with a storage capacity of 295 acre-feet and a normal storage level of 26.9 acre-feet. Despite its low hazard potential, the dam has a moderate risk assessment rating of 3 due to its location and potential impact on surrounding areas.

Managed by the Kansas Department of Agriculture, Site 75a is regulated, permitted, inspected, and enforced by the state, ensuring its compliance with safety standards and guidelines. Although the dam's condition assessment is currently not rated, it has not undergone any modifications since its completion. With a spillway width of 80 feet and a maximum discharge capacity of 2240 cubic feet per second, Site 75a serves as a crucial infrastructure for mitigating flood risks in the region while also providing valuable data for water resource and climate enthusiasts interested in monitoring and managing the local watershed.