Lyndon Lake Dam, also known as Lyndon City Dam, is a privately-owned structure located in Osage County, Kansas. This earth dam, completed in 1966 by REISS & GOODNESS, stands at a height of 43 feet and spans a length of 1360 feet along Salt Creek. With a primary purpose of recreation, the dam offers a storage capacity of 1354 acre-feet and a normal storage level of 948 acre-feet.

Managed and regulated by the Kansas Department of Agriculture, Lyndon Lake Dam has a significant hazard potential and is subject to regular state inspections and enforcement measures. The dam features an uncontrolled spillway with a width of 175 feet, capable of handling a maximum discharge of 6388 cubic feet per second. Despite being classified as having a moderate risk level, the dam's condition assessment is currently listed as "Not Rated", indicating a need for further evaluation and monitoring to ensure its structural integrity and safety.

In the event of an emergency, the dam's Emergency Action Plan status is not specified, highlighting the importance of adequate preparation and risk management measures. With its scenic location and recreational opportunities, Lyndon Lake Dam serves as both a popular local attraction and a critical component of the region's water resource infrastructure, emphasizing the importance of ongoing maintenance and monitoring efforts to safeguard against potential risks and ensure public safety.