Savanna is a city in Carroll County, Illinois, United States. The population was 3,062 at the 2010 census, down from 3,542 at the 2000 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 the U.S. Highway 52 route. The bridge leads to Sabula, Iowa, which is across the river from Savanna. U.S. Highway 52 goes through Savanna.
Savanna has produced several notable natives. These include "America's Waltz King" Wayne King, professional wrestler Tommy Treichel, Billy Zoom (Tyson Kindell) founding member and original guitarist of the punk band X, and former NASA astronaut Dale Gardner.
In 1917, the United States Army purchased 13,062 acres (53 km2) 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, Illinois Arsenal. In 1921, the mission of the installation was changed to be a depot.