Johnson Dam, located in Pottawattamie County, Iowa, is a privately owned structure designed by the USDA NRCS for fire protection, stock, or small fish pond purposes. Completed in 1959, the earth dam stands at a height of 27 feet and spans 472 feet in length, with a storage capacity of 80 acre-feet. Situated on the TR-West Nishnabota River, the dam serves as a vital resource for water management and conservation in the region.

Despite its low hazard potential and moderate risk assessment, Johnson Dam is regulated by the Iowa Department of Natural Resources and undergoes regular inspections to ensure its structural integrity. The dam has not been rated for its current condition, but its primary purpose and design indicate its importance in safeguarding against wildfires, supporting livestock, and providing habitat for small fish populations. With a surface area of 5.2 acres and a drainage area of 0.52 square miles, Johnson Dam plays a crucial role in maintaining water quality and quantity in the area.

As a key feature in the local water infrastructure, Johnson Dam's uncontrolled spillway and soil foundation highlight its reliance on natural resources for operation. While the dam has not been modified in recent years, its historic significance and ongoing regulatory oversight underscore the importance of sustainable water resource management in mitigating climate-related risks. For water resource and climate enthusiasts, Johnson Dam serves as a case study in balancing human needs with environmental stewardship to ensure the resilience of water systems in the face of changing weather patterns and increasing demands.