Nelson is a federal-owned dam located in Taylor County, Wisconsin, with a primary purpose of recreation. Built in 1968, this earth dam stands at 12 feet high and has a length of 690 feet. It serves as a barrier on the South Twin Lake Outlet, providing a storage capacity of 300 acre-feet and a surface area of 25 acres.

Although Nelson has a low hazard potential, it is categorized with a very high risk assessment due to its critical importance in flood control and water management in the region. The dam has not been inspected recently, but it is marked as not rated in terms of condition assessment. With a controlled spillway type and an overall risk management plan in place, Nelson plays a crucial role in maintaining water resources and climate resilience in the surrounding area.

Water resource and climate enthusiasts will find Nelson to be a key structure in the Detroit District's water management system. Its location, design, and purpose make it a significant asset for recreation and flood control in the region. While its risk assessment is high, the dam's operational history and risk management measures demonstrate its commitment to ensuring the safety and sustainability of the surrounding environment.