Manchester Milldam, located in Manchester, Iowa on the Maquoketa River, was completed in 1905 with a primary purpose of recreation. The dam stands at 11 feet tall and spans 201 feet in length, providing a storage capacity of 395 acre-feet and covering a surface area of 70 acres. State regulated by the Iowa DNR, the dam is inspected, permitted, and enforced for safety and environmental compliance.

The dam's hazard potential is rated as low, with a moderate risk assessment score of 3. Despite being classified as not rated for condition assessment, Manchester Milldam remains a key structure for recreational activities in the area. While the last inspection dates back to 1989, the dam continues to serve its purpose effectively, offering opportunities for fishing, boating, and wildlife observation along the Maquoketa River. With its historic significance and scenic value, Manchester Milldam is a vital resource for water enthusiasts and climate advocates to appreciate and protect.