Amacoy is a flood risk reduction structure located in Rusk, Wisconsin, on the TR CHIPPEWA river. Built in 1967 by the USDA NRCS, this earth dam stands at a height of 20 feet and has a storage capacity of 5400 acre-feet. With a maximum discharge of 740 cubic feet per second, Amacoy serves the primary purpose of flood risk reduction while also providing recreational opportunities in the area.

Managed by the Wisconsin Department of Natural Resources, Amacoy is regulated, inspected, and enforced by state agencies to ensure its safety and functionality. Despite being classified as having a low hazard potential, the dam is considered to have moderate risk factors that are continuously monitored and managed. Although its condition assessment is currently not rated, the structure undergoes regular inspections every 10 years to maintain its integrity.

Located within the Detroit District of the US Army Corps of Engineers, Amacoy has not been modified since its completion and does not have associated structures or outlet gates. With its uncontrolled spillway type and moderate risk assessment, Amacoy stands as a vital water resource management tool in the region, embodying a balance between flood protection and recreational use.