Day Dam, located in Coppock, Iowa, is a privately owned structure designed by USDA NRCS for fire protection, stock, or small fish pond purposes. Completed in 1971, this earth dam stands at a height of 24 feet and spans 385 feet in length, with a storage capacity of 70 acre-feet. It is regulated by the Iowa Department of Natural Resources and is considered to have low hazard potential and a moderate risk assessment rating.

The dam, situated on TR-Lake Darling, serves as a vital resource for water management and conservation in Washington County, Iowa. With a drainage area of 0.25 square miles, the dam provides essential protection for local communities against flooding and ensures a reliable water supply for agricultural and recreational use. Despite being uncontrolled, the spillway width and discharge capacity are currently not specified, highlighting the need for ongoing monitoring and maintenance to mitigate any potential risks.

While the dam's condition assessment is listed as "Not Rated," its primary purpose and historical significance underscore its importance in safeguarding the surrounding environment and supporting sustainable water resources management. As water resource and climate enthusiasts, it is crucial to recognize the role of structures like Day Dam in balancing the needs of communities and ecosystems while promoting resilience in the face of changing climate conditions.