Hayton, also known as Old Mill, is a private dam located in Calumet, Wisconsin, along the South Branch Manitowoc River. Completed in 1908, this Earth-type dam stands at a height of 14 feet and has a maximum storage capacity of 200 acre-feet. The dam primarily serves a recreational purpose and is regulated by the Wisconsin Department of Natural Resources (WIDNR), with regular inspections conducted to ensure its structural integrity.

Despite its low hazard potential and fair condition assessment, Hayton poses a moderate risk, with a moderate risk assessment score of 3. The dam's spillway type is uncontrolled, and it has a maximum discharge capacity of 2410 cubic feet per second. The last inspection was conducted in January 2018, with a scheduled inspection frequency of 10 years. The dam's emergency action plan status and risk management measures are currently unknown, highlighting the importance of ongoing monitoring and assessment to mitigate potential risks associated with this critical infrastructure.

Overall, Hayton serves as a historic landmark and recreational site in the region, offering both leisure opportunities and potential risks that require careful management and oversight. With its picturesque location and vital role in water resource management, Hayton remains a significant asset to the community and a focal point for water resource and climate enthusiasts alike.