Upper Waterloo is a privately owned dam located in Waterloo, Wisconsin, that serves primarily for recreation purposes. Built in 1915, this gravity dam stands at a height of 17 feet with a hydraulic height of 11 feet, creating a reservoir with a storage capacity of 860 acre-feet. The dam offers a surface area of 81 acres for recreational activities and has a maximum discharge capacity of 3250 cubic feet per second.

Despite its age, Upper Waterloo has a high hazard potential due to its condition assessment being marked as "Not Rated" and a very high risk assessment rating. The dam has not been inspected recently, and its emergency action plan status is unknown. With its location on the Maunesha River and the potential impact of failure on downstream areas, it is crucial that proper risk management measures and emergency preparedness protocols are put in place for this historic structure. Water resource and climate enthusiasts may find Upper Waterloo to be an area of interest for further study and monitoring to ensure its safety and sustainability in the face of changing environmental conditions.