Savanna is a city in Carroll County, Illinois, United States. The population was 2,783 at the 2020 census, down from 2,945 at the 2010 census. Savanna is located along the Mississippi River at the mouth of the Plum River. Going from north to south, the second automobile bridge between Iowa and Illinois is located just north of Savanna, and is part of U.S. Route 52. The bridge leads to Sabula, Iowa, which is across the river from Savanna. Savanna is also served by two major railroads, the Burlington Northern and Santa Fe Railway (BNSF) Railway Company and the (CP) Canadian Pacific. Savanna also has a small airport, the Tri-Township Airport (KSFY). Savanna is protected by the Savanna Police, Fire Department and Ambulance Service. All three organizations maintain stations on Chicago Avenue. The three organizations were located in the same building (a throwback to when the fire department was responsible for the ambulance) but the original building only houses the fire department and one of the backup centers for Carroll County 911 dispatch. Savanna formerly had its own hospital, but this has since been converted to an assisted living facility, Pinnacle Place. All ambulance patients are transported to Mercy Medical Center in Clinton, Iowa or other Illinois hospitals. The Savanna Ambulance is one of two in the county to have paramedic certified members (a distinction shared with the Mount Carroll Volunteer Ambulance.) History The region was once part of the vast hunting grounds of different native American tribes, including the Sauk. Following the Treaty of St. Louis (1804) and a number of additional treaties, land in Illinois along the Eastern bank of the Mississippi River was opened to settlement by farmers. Towns such as Savanna grew their commerce by using the river for efficient transport. Savanna's earliest settlers experienced some repercussions during the Black Hawk War in 1832. Savanna Army Depot In 1917, the United States Army purchased of land about seven miles (11 km) north of Savanna to construct the Savanna Army Depot. Originally the land was to be used as a test range for munitions produced at the Rock Island Arsenal in Rock Island, Illinois. In 1921, the mission of the installation was changed to be a depot./. From World War II through Vietnam, Savanna Army Depot served as a munitions maintenance and storage facility for traditional, chemical, and nuclear weapons. With about 2,000 highly trained civilian employees holding