Delavan, also known as Comus Lake, is a gravity dam located in the city of Delavan, Wisconsin, along Turtle Creek. Owned and regulated by the local government, this dam was completed in 1947 and primarily serves the purpose of recreation. With a height of 13 feet and a storage capacity of 850 acre-feet, Delavan Dam covers a surface area of 164 acres and has a drainage area of 67 square miles.

Despite being classified as having a low hazard potential and fair condition assessment, Delavan Dam is considered to have a very high risk due to its location and surrounding factors. The dam has a controlled spillway and a maximum discharge of 1490 cubic feet per second. While the last inspection was conducted in October 2011, with a scheduled frequency of every 10 years, the risk management measures and emergency action plans for the dam are not readily available. With its historical significance and importance for recreational activities, Delavan Dam remains a notable landmark in the water resource and climate enthusiast community.