Mazomanie, also known as Lake Marion Outlet, is a local government-owned dam located in Dane County, Wisconsin. Built in 1851, this earthen dam sits on the Black Earth Creek and serves primarily for recreational purposes, offering a surface area of 20 acres and a normal storage capacity of 50 acre-feet. With a dam height of 14 feet and a hydraulic height of 8 feet, Mazomanie has a drainage area of 35.2 square miles and a maximum discharge of 50 cubic feet per second.

Despite its long history, Mazomanie poses a high hazard potential and has been rated as unsatisfactory in terms of its condition assessment. The dam underwent modifications in 1971, and its last inspection was conducted in January 2013. With a very high risk assessment rating, it is crucial for the structure to undergo regular inspections and maintenance to ensure its safety and the protection of downstream areas. The dam is regulated by the Wisconsin Department of Natural Resources and is subject to state permitting, inspection, and enforcement.

Water resource and climate enthusiasts in Mazomanie can appreciate the historical significance and recreational value of this dam while also recognizing the importance of its maintenance and risk management. As a key element in the local water infrastructure, Mazomanie serves as a reminder of the ongoing challenges and responsibilities in managing water resources effectively in the face of changing climate conditions. By staying informed and engaged in the monitoring and maintenance of structures like Mazomanie, enthusiasts can contribute to the sustainable management of water resources for future generations.