Johnson Dam, located in Mills County, Iowa, is a privately owned structure designed by NRCS for fire protection and as a small fish pond. Completed in 2006, the earth dam stands at a height of 30 feet and spans 513 feet in length, with a storage capacity of 83 acre-feet. Situated on TR- Keg Creek, the dam serves as a crucial water resource for the surrounding area, with a normal storage capacity of 54 acre-feet and a surface area of 5.1 acres.

Managed by the Iowa DNR, Johnson Dam is regulated, permitted, inspected, and enforced by the state. Classified with a low hazard potential and a moderate risk assessment, the dam meets guidelines for emergency action plans and risk management measures. While the spillway is uncontrolled with a spillway width of 1 foot, the dam's condition assessment is currently not rated, with no recent inspection date available. Despite this, Johnson Dam remains a vital asset for water storage and conservation in the region.

For water resource and climate enthusiasts, Johnson Dam offers insights into the intersection of infrastructure, water management, and environmental stewardship. With its strategic location, design features, and regulatory oversight, the dam provides a tangible example of how private entities can contribute to sustainable water practices. As part of the broader network of dams and reservoirs in the area, Johnson Dam plays a crucial role in ensuring water security, flood protection, and habitat preservation for the local ecosystem.