Shell Rock Milldam, located in Shell Rock, Iowa, is a rockfill dam constructed in 1928 for recreational purposes along the Shellrock River. This local government-owned structure stands at a height of 7 feet and has a storage capacity of 229 acre-feet, with a normal storage level of 152 acre-feet. The dam spans 221 feet in length and covers a surface area of 45 acres in Butler County, Iowa.

Managed by the Iowa Department of Natural Resources, Shell Rock Milldam is regulated, permitted, inspected, and enforced by state authorities to ensure its safety and compliance with regulations. Despite being classified as having a low hazard potential, the dam is considered to have a moderate risk level, with a risk assessment score of 3. The last inspection of the dam was conducted in September 1989, and its condition is currently rated as "Not Rated."

For water resource and climate enthusiasts interested in exploring the intersection of dam infrastructure and environmental conservation, Shell Rock Milldam offers a unique insight into the management of recreational water structures in rural Iowa. With its picturesque location along the Shellrock River, this dam serves as a vital recreational resource for the local community while also highlighting the importance of maintaining and monitoring dam safety in the face of changing environmental conditions and regulatory requirements.