Lake Mattoon is a man-made reservoir located in Coles County, Illinois. It was created in the 1970s by damming the Kaskaskia River to provide water supply, flood control, and recreational opportunities for the surrounding community. The lake covers approximately 1,500 acres and has a maximum depth of around 30 feet. The area around Lake Mattoon offers various outdoor activities, including fishing, boating, and hiking. It is home to several species of fish, such as bass and crappie, making it a popular spot for anglers. Additionally, the lake features picnic areas and trails for visitors to enjoy nature.