Iowa Noname3, located in Rathbun Reservoir, Appanoose County, Iowa, is a privately-owned earth dam completed in 1972 for fire protection, stock, or small fish pond purposes. Managed by the Iowa Department of Natural Resources, this dam has a height of 36 feet and a length of 352 feet, with a storage capacity of 58 acre-feet. The dam sits on the TR-Chariton River and is regulated and inspected by state authorities to ensure its safety and functionality.

Despite its low hazard potential and moderate risk assessment, Iowa Noname3 has not been rated for its condition. The dam features an uncontrolled spillway and is situated in a drainage area of 0.2 square miles. With a surface area of 3 acres and a normal storage capacity of 24 acre-feet, the dam serves as a crucial water resource in the region. Although last inspected in 1988, the dam's risk management measures and emergency action plans are yet to be fully assessed and updated.

As a key infrastructure in the Rock Island District, Iowa Noname3 plays a vital role in water resource management and climate resilience efforts in the area. With its unique design by USDA NRCS and oversight by state agencies, the dam serves as a valuable asset for local communities and wildlife. As water resource and climate enthusiasts, it is essential to monitor and support the maintenance and regulation of structures like Iowa Noname3 to ensure their long-term sustainability and effectiveness in safeguarding water resources and ecosystems.