Lehman Dam, located in Linn County, Iowa, is a privately owned earth dam completed in 1975 for recreational purposes. The dam stands at a height of 18 feet and spans 1000 feet, with a storage capacity of 81 acre-feet. Situated on TR-Pleasant Run in Cedar River, the dam's primary purpose is to provide recreational opportunities for the local community.

Managed by the Iowa Department of Natural Resources, Lehman Dam is regulated, permitted, inspected, and enforced by state authorities to ensure its safe and efficient operation. Despite being classified as having a low hazard potential, the dam's condition is currently not rated. However, a moderate risk assessment has been assigned to the structure, indicating the need for ongoing monitoring and potential risk management measures.

As a key feature in the water resource management of the area, Lehman Dam plays a crucial role in providing recreational activities and maintaining the ecological balance of the surrounding environment. With its picturesque location and important functions, the dam serves as a valuable asset for water resource and climate enthusiasts interested in the sustainable use of natural resources.