Middle Lake, located in Nicollet, Minnesota, is a gravity dam built in 1946 with a primary purpose that goes beyond just water storage. Owned by the local government, this dam on County Ditch 4A stands at 6 feet tall and has a storage capacity of 6,597 acre-feet. The dam, with a drainage area of 14.4 square miles, serves various regulatory functions under the oversight of the Minnesota Department of Natural Resources and is subject to regular inspections to ensure its satisfactory condition.

The dam at Middle Lake plays a crucial role in managing water resources in the area, with a low hazard potential and a maximum discharge capacity of 300 cubic feet per second. Despite its age, the dam has been well-maintained and meets regulatory guidelines, with the last inspection conducted in June 2016. The dam's satisfactory condition and efficient operation underscore its importance in mitigating flood risks and ensuring water supply reliability for the local community. Middle Lake serves as a testament to the collaborative efforts between local government and state agencies in safeguarding water resources and climate resilience in Minnesota.