Gonseth Dam, located in Thayer, Iowa, is a privately owned structure designed by USDA NRCS with a primary purpose of fire protection, stock, or small fish pond. Completed in 1992, this earth dam stands at a height of 26 feet and has a length of 385 feet, providing a storage capacity of 63 acre-feet. The dam is situated on TR-Four Mile Creek and is regulated by the Iowa Department of Natural Resources.

With a low hazard potential and a moderate risk assessment score of 3, Gonseth Dam plays a crucial role in water resource management in Clarke County, Iowa. The dam's reservoir covers a surface area of 3.4 acres and has a drainage area of 0.29 square miles. Despite its uncontrolled spillway type, the dam has not undergone a condition assessment and is currently rated as "Not Rated" in terms of its structural integrity.

Overall, Gonseth Dam serves as a vital asset for fire protection and agricultural purposes in the region. As water resource and climate enthusiasts, it is important to monitor and assess the condition of such structures to ensure their continued functionality and safety for the surrounding community and ecosystem.