Osage City Lake Dam, located in Lyndon, Kansas, is a vital piece of infrastructure primarily designed for water supply purposes. Completed in 1940, this earth dam stands at a height of 29 feet and has a hydraulic height of 26 feet. The dam has a storage capacity of 1181.4 acre-feet, with a normal storage level of 369.3 acre-feet, serving the surrounding area with essential water resources.

Managed by the local government and regulated by the Kansas Department of Agriculture, Osage City Lake Dam is subject to regular inspections to ensure its safety and functionality. Despite its satisfactory condition assessment, the dam carries a high hazard potential due to its location and design. In case of emergencies, the dam operators have prepared an Emergency Action Plan (EAP) to guide response efforts. With a moderate risk assessment rating, the dam continues to be a critical component in the region's water resource and climate management strategies.

In the event of a significant discharge, the dam's uncontrolled spillway with a width of 170 feet can manage flows up to 7882 cubic feet per second. With its historical significance and ongoing regulatory oversight, Osage City Lake Dam remains a crucial asset for water supply and environmental conservation in the area.