Located in Grafton, Wisconsin, the Grafton dam on the Milwaukee River is a recreational dam completed in 1918 with a primary purpose of providing recreational opportunities for the community. The dam stands at a height of 20 feet and has a hydraulic height of 12 feet, with a length of 206 feet and a storage capacity of 400 acre-feet. The dam serves as a controlled spillway with a maximum discharge capacity of 15,420 cubic feet per second, making it a significant structure in terms of hazard potential.

Despite being classified as having a significant hazard potential, the Grafton dam is currently assessed to be in fair condition, with the last inspection conducted in October 2017. The dam's risk assessment is rated as very high (1), indicating the need for continued monitoring and maintenance to ensure the safety of the structure and surrounding areas. With a history of modifications in 2014 and ongoing state regulation and inspection, the Grafton dam remains a vital component of the local water resource infrastructure in Ozaukee County, Wisconsin.