Johnson Dam, located in Mt. Ayr, Iowa, is a local government-owned structure designed by NRCS along Walnut Creek. Completed in 2007, this earth dam stands at a height of 24 feet and stretches 492 feet in length, with a storage capacity of 83 acre-feet. Its primary purposes include fire protection and serving as a small fish pond, contributing to the local ecosystem and water resource management.

With a low hazard potential and a moderate risk assessment rating, Johnson Dam is state-regulated by the Iowa Department of Natural Resources for inspection, enforcement, and permitting. Despite its uncontrolled spillway type, the dam's condition assessment is currently not rated, and emergency action plans and inundation maps are yet to be prepared. The dam's location in Ringgold County, Iowa, showcases its significance in safeguarding the surrounding area from potential flooding and ensuring water availability for various purposes.

For water resource and climate enthusiasts, Johnson Dam presents an intriguing case study in dam management and infrastructure development. Its role in fire protection, stock maintenance, and ecological conservation highlights the interconnectedness of water resources with community resilience and environmental sustainability. As efforts continue to assess and mitigate risks associated with the dam, its presence stands as a testament to the importance of responsible water resource management in mitigating climate impacts and safeguarding against natural disasters.