Lake Mattoon is a 1,050-acre reservoir located in Coles County, Illinois, Cumberland County, Illinois, and Shelby County, Illinois. Almost three-quarters of the lake, 765 acres, is located in Shelby County. The reservoir was built to supply tap water to Mattoon, Illinois and Neoga, but also provides fishing and boating recreation. The lake is 4 miles long and …Lake Mattoon is a 1,050-acre reservoir located in Coles County, Illinois, Cumberland County, Illinois, and Shelby County, Illinois. Almost three-quarters of the lake, 765 acres, is located in Shelby County. The reservoir was built to supply tap water to Mattoon, Illinois and Neoga, but also provides fishing and boating recreation. The lake is 4 miles long and 0.5 miles wide.
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