Hayden is a privately-owned dam located in Dunn, Wisconsin, along Rock Creek. Built in 1967 for flood risk reduction, Hayden is an earth dam standing at 34 feet tall with a hydraulic height of 26 feet. The dam has a storage capacity of 16 acre-feet and a maximum discharge of 20 cubic feet per second. Despite its low hazard potential, Hayden is considered to have a very high risk assessment due to its critical role in flood risk reduction in the area.

Managed by the Wisconsin Department of Natural Resources, Hayden is subject to state regulation, permitting, inspections, and enforcement. The dam is regularly inspected every 10 years, with the last inspection conducted in May 2020. While the condition assessment is currently "Not Rated," Hayden remains a crucial infrastructure for managing flood risks in the region, particularly during times of high water flow.

With its controlled spillway and limited surface area of 1 acre, Hayden plays a vital role in protecting the surrounding communities from potential flooding events. Despite its age, Hayden continues to serve its primary purpose effectively, highlighting the importance of maintaining and monitoring water resource infrastructure to ensure the safety and well-being of local residents and ecosystems.