The Pickerel Control Structure in Rhinelander, Wisconsin, is a vital component of the St Germain River's hydroelectric system, serving the primary purpose of flood risk reduction and hydroelectric power generation. Built in 1935, this gravity dam stands at a height of 20.5 feet and has a storage capacity of 46,006 acre-feet, with a controlled spillway width of 10 feet to manage maximum discharges of up to 810 cubic feet per second.

Owned and operated by a public utility, this structure is not state regulated but falls under the jurisdiction of the Federal Energy Regulatory Commission. With a low hazard potential and a very high risk assessment rating, the Pickerel Control Structure is inspected every three years to ensure its safety and functionality. Despite its age, the dam continues to play a crucial role in managing water resources and mitigating flood risks in the region, highlighting the importance of maintaining and monitoring such critical infrastructure in the face of changing climate patterns.