Lake Mattoon is a 1,050-acre (4.2 km²) reservoir located in Coles County, Illinois, Cumberland County, Illinois, and Shelby County, Illinois. Almost three-quarters of the lake, 765 acres (3.1 km²), 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 (6.4 km) long and 0.5 miles (0.8 km) wide.The lake is owned by the city of Mattoon.
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