Zimmerman Dam, located in Indianola, Iowa, is a privately owned structure designed by NRCS with a primary purpose of fire protection, stock, or small fish pond. Completed in 1998, this earth dam stands at a height of 27 feet and stretches 302 feet in length, with a storage capacity of 20 acre-feet. It sits on the TR- South River and is regulated by the Iowa DNR, with state permitting, inspection, and enforcement in place.

Despite its low hazard potential and moderate risk assessment, Zimmerman Dam plays a crucial role in water resource management in Warren County, Iowa. With a surface area of 1.7 acres and a drainage area of 0.07 square miles, this dam serves as a vital infrastructure for water storage and flood control. Its uncontrolled spillway and soil foundation highlight the importance of regular maintenance and monitoring to ensure its continued effectiveness in safeguarding the surrounding environment and communities. For water resource and climate enthusiasts, Zimmerman Dam stands as a testament to the intersection of human engineering and natural resource management in balancing the needs of both people and the environment.