Miller Dam, located in Denison, Iowa, is a private earth dam completed in 1944 with a primary purpose of fire protection, stock, or small fish pond. The dam stands at a height of 30 feet and stretches 400 feet in length, creating a reservoir with a storage capacity of 28 acre-feet. Situated on Walnut Creek, the dam serves as a low hazard structure with a moderate risk assessment.

Managed by the Iowa Department of Natural Resources, Miller Dam is regulated, permitted, inspected, and enforced by state agencies to ensure its safety and functionality. Despite its age, the dam has not been rated for its condition, and its emergency action plan status remains unknown. With a surface area of 2.8 acres and a drainage area of 0.3 square miles, Miller Dam provides valuable water resources for the surrounding area while also posing a low risk to downstream communities. For water resource and climate enthusiasts, Miller Dam serves as a reminder of the importance of maintaining and managing aging infrastructure to mitigate potential hazards and ensure water security for future generations.