Lake Decatur is a 2,800-acre reservoir located in the city of Decatur, Illinois, USA, east of downtown. The city and lake both share the name of U.S. Navy Commodore Stephen Decatur. The lake is 613 feet above sea level and has a watershed of 925 square miles or 592,000 acres reaching into parts of seven counties. The largest lake on the Sangamon River…Lake Decatur is a 2,800-acre reservoir located in the city of Decatur, Illinois, USA, east of downtown. The city and lake both share the name of U.S. Navy Commodore Stephen Decatur. The lake is 613 feet above sea level and has a watershed of 925 square miles or 592,000 acres reaching into parts of seven counties. The largest lake on the Sangamon River, it was created in 1920–1922.
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