Big St Germain is a hydroelectric dam located in Vilas, Wisconsin, along the St Germain River. Built in 1923, this Gravity-type dam stands at 7 feet tall and has a Hydraulic height of 4 feet, with a storage capacity of 33,655 acre-feet. The dam serves multiple purposes, including flood risk reduction and hydroelectric power generation, making it a valuable resource for the region.

Managed by the Federal Energy Regulatory Commission, Big St Germain has a low hazard potential and a high risk assessment rating. It is equipped with three slide gates for water release and has a spillway width of 19 feet. Despite its age, the dam's condition assessment is not available, and it was last inspected in June 2017. The emergency action plan was last revised in December 2018, highlighting the importance of preparedness and risk management for this critical infrastructure.

As a key feature in the Detroit District's water resource management, Big St Germain plays a vital role in maintaining water levels and providing clean energy to the surrounding area. With its historical significance and ongoing operational importance, this dam stands as a testament to the intersection of water resource management and climate resilience in the region.