Greiner Dam, located in Washington County, Iowa, was completed in 2002 and serves multiple purposes including fire protection and as a stock or small fish pond. Owned privately, the dam is regulated by the Iowa Department of Natural Resources and undergoes regular inspections to ensure its safety and functionality. With a height of 32 feet and a length of 380 feet, Greiner Dam has a storage capacity of 40 acre-feet and a surface area of 3.5 acres, making it a vital resource for the local community.

Constructed by the NRCS, Greiner Dam is classified as an earth dam with a soil foundation. It features an uncontrolled spillway and is designated as having a low hazard potential. Despite being rated as "Not Rated" in terms of condition assessment, the dam is considered to have a moderate risk level. The risk assessment indicates a moderate risk level of 3, emphasizing the importance of ongoing monitoring and maintenance to ensure the dam's integrity and safety for both water resource and climate enthusiasts in the area.

Situated along the TR-Walnut Creek, Greiner Dam plays a crucial role in managing water resources in the region. With its strategic location and functional design, the dam serves as a valuable asset for fire protection, stock, and as a small fish pond. As efforts continue to mitigate risks and ensure the dam's long-term sustainability, Greiner Dam stands as a testament to effective water resource management and climate resilience in Washington County, Iowa.