Arnold Dam, located in Chillicothe, Iowa, is a privately owned structure designed by the USDA NRCS. Completed in 1997, this earth dam stands at a height of 29 feet and spans 330 feet in length. Its primary purpose is for fire protection, stock, or as a small fish pond, with a storage capacity of 35 acre-feet and a surface area of 2 acres.

Situated on the TR-Des Moines River, Arnold Dam has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Despite not being state regulated or inspected, this dam serves as a vital resource for the local community, providing essential water supply and potential recreational opportunities. While the spillway type is uncontrolled, the risk assessment for the dam is moderate, emphasizing the importance of continued monitoring and maintenance to ensure its safety and functionality for years to come.

With its tranquil surroundings and crucial role in water resource management, Arnold Dam serves as a notable feature in the Wapello County landscape. As a key contributor to fire protection and water storage, this structure represents the collaborative efforts of the Natural Resources Conservation Service and the local community to safeguard and utilize water resources effectively. As climate change continues to impact water availability, the maintenance and monitoring of dams like Arnold Dam are essential in ensuring sustainable water management practices for future generations.