Carlyle Lake Dam is a significant structure located in Carlyle, Illinois. It was completed in 1967 and serves multiple purposes, including flood control, water supply, and recreation. The dam creates Carlyle Lake, which is the largest man-made lake in Illinois, providing opportunities for fishing, boating, and camping. The dam is managed by the U.S. Army Corps of Engineers, ensuring its safety and operational efficiency. It plays a crucial role in managing the Kaskaskia River watershed, helping to prevent flooding in surrounding areas while also supporting local ecosystems and wildlife habitats.