Arnold Dam, located in Rathbun Reservoir, Iowa, is a privately owned structure designed by the Soil Conservation Service (SCS) for fire protection, stock, and small fish pond purposes. Completed in 1984, the earth dam stands at a height of 28 feet and stretches 550 feet in length. With a storage capacity of 115 acre-feet, the dam serves a drainage area of 0.23 square miles and covers a surface area of 8.3 acres.

Managed by the Iowa Department of Natural Resources, Arnold Dam is regulated, permitted, inspected, and enforced by state authorities to ensure its safety and functionality. Despite its low hazard potential and moderate risk assessment, the dam's condition is currently not rated, highlighting the need for ongoing monitoring and maintenance. The dam's primary purpose, coupled with its controlled spillway and uncontrolled spillway type, underscores its importance in safeguarding the surrounding area from potential flooding and water resource management.

In the picturesque setting of Lucas County, Iowa, Arnold Dam stands as a vital component of the local ecosystem and community. As water resource and climate enthusiasts delve into the intricacies of this structure, its role in fire protection, stock maintenance, and ecological preservation becomes increasingly apparent. With a history dating back to the 1980s, the dam continues to serve its intended purposes while emphasizing the importance of sustainable water management practices in the region.