Sullivan Lake, located in the heart of Superior National Forest in Minnesota, is a picturesque water resource that serves multiple purposes including recreation, fish and wildlife pond, and flood risk reduction. Managed by the Forest Service, this Earth dam structure stands at a height of 7 feet with a hydraulic height of 8 feet, completed in the year 1900. The lake has a storage capacity of 250 acre-feet, with a normal storage of 200 acre-feet, and covers a surface area of 41 acres with a drainage area of 4 square miles.

The dam, built on Sullivan Creek, spans 800 feet in length and features an uncontrolled spillway with a width of 180 feet, ensuring a maximum discharge of 100 cubic feet per second. Despite its low hazard potential and moderate risk assessment, the condition of the dam is currently not rated, with the last inspection conducted in May 2017. With its tranquil surroundings and vital role in the local ecosystem, Sullivan Lake remains a key resource for water and climate enthusiasts to appreciate and monitor for its continued functionality and environmental impact.