Greiner Dam, located in the Hickory Hills Recreation Area in Tama, Iowa, was completed in 1975 by the USDA NRCS. This private dam has a primary purpose of fire protection, stock, or small fish pond, with a height of 28 feet and a length of 575 feet. With a storage capacity of 96 acre-feet and a surface area of 7.6 acres, the dam serves as a vital resource for water management in the area.

The dam is regulated by the Iowa Department of Natural Resources and undergoes state permitting, inspection, and enforcement to ensure its safety and functionality. Despite being rated as having a low hazard potential, the dam is considered to have a moderate risk level due to its location on TR-Twelve Mile Creek. With its uncontrolled spillway and soil foundation, Greiner Dam plays a crucial role in managing water resources in the region and mitigating potential risks associated with flooding and water scarcity.

Overall, Greiner Dam stands as a testament to the importance of sustainable water resource management in the face of changing climate conditions. As a key infrastructure for fire protection and ecosystem support, this earth dam serves as a critical component of the local water system, highlighting the need for ongoing monitoring and maintenance to ensure its continued effectiveness in the years to come.