Bog Brook, located in Lily, Wisconsin, is a recreational dam built in 1962 with a primary purpose of providing fish and wildlife habitat as well as recreational opportunities. The earth dam stands at a height of 10 feet and spans a length of 250 feet, with a maximum storage capacity of 2490 acre-feet and a normal storage level of 1000 acre-feet. The dam is regulated by the Wisconsin Department of Natural Resources and undergoes regular inspections to ensure its fair condition and low hazard potential.

The controlled spillway of Bog Brook dam, with a width of 28 feet, allows for controlled water releases when needed, with a maximum discharge capacity of 133 cubic feet per second. The surrounding area covers a surface area of 490 acres and has a drainage area of 9.9 square miles. Despite its fair condition assessment, Bog Brook dam is classified as having a very high risk due to its location and potential impact in the event of a failure. It is important for water resource and climate enthusiasts to stay informed about the management and maintenance of this dam to ensure the safety of the surrounding community and environment.