Upper Horicon, also known as Pool One, is a federal-owned water resource located in Horicon, Dodge County, Wisconsin. This recreational dam on the Main Ditch was completed in 1945 and stands at a height of 8 feet with a length of 21,700 feet. With a storage capacity of 1,600 acre-feet and a surface area of 320 acres, it serves as a popular spot for water and climate enthusiasts to enjoy outdoor activities.

Managed by the Wisconsin Department of Natural Resources, Upper Horicon is regulated, permitted, inspected, and enforced by state agencies to ensure its safety and compliance. The dam's hazard potential is rated as low, but its risk assessment indicates a very high risk level, signaling the need for proactive risk management measures. While the dam's condition assessment is labeled as "Not Rated," its emergency action plan status, inundation maps, and risk management measures are currently not documented.

Overall, Upper Horicon offers a picturesque setting for recreation and relaxation, with opportunities for boating, fishing, and wildlife observation. As a vital part of the water resource infrastructure in Wisconsin, it serves as a reminder of the importance of maintaining and managing our natural resources in the face of changing climate conditions.