Iris Lake Dam, located in Fayette County, Iowa, is a privately-owned earth dam completed in 2004 by designers Richard Jensen and James Warner. The dam serves multiple purposes, including fire protection and creating a small fish pond. With a height of 66 feet and a length of 650 feet, the dam has a storage capacity of 618 acre-feet and covers a surface area of 19 acres.

The dam is regulated by the Iowa Department of Natural Resources and undergoes regular inspections to ensure its structural integrity. Despite being classified as having low hazard potential, the dam carries a moderate risk level due to its location on Tr-Turkey River. The condition assessment in 2019 rated the dam as satisfactory, with a five-year inspection frequency in place to monitor any changes in its risk profile.

Overall, Iris Lake Dam provides essential services such as fire protection and water storage in the area while also offering recreational opportunities for fishing and wildlife habitat. Its design and construction adhere to regulatory standards, ensuring the safety and functionality of the dam for both the community and the environment.