The "Steamboat Bill" Memorial Bridges are two bridges that span one of the widest points along the Tennessee River within the city of Decatur, Alabama, between Morgan County, and Limestone County. One is a cantilever truss, and the other is a reinforced concrete. The bridges carry US 31, US 72A, and State Route 20 from the intersection of Wilson Street (US 72A, and SR 20), and 6th Avenue (US 31) in northeast Decatur.