U.S. Federal Route 20 is a east-west highway across Central Black Hwak County. This is a multi-lane divied expresway through the county. It serves as a main east-west corridor in Greater-Waterloo. U.S. Rt. 20 passes through the following towns in Black Hawk County. Cedar Falls Waterloo
A junction marker on SB IA St Rt 27/58. EB U.S. Rt. 20/SB IA St Rt 27 in Waterloo. A street-sign on a stop light mast in Waterloo on U.S. Rt. 63. EB U.S. Rt. 20/SB IA St Rt 27 near I-380/U.S. Rt. 218. EB U.S. Rt. 20/SB IA St Rt 27 at I-380/IA St Rt 27. EB U.S. Rt. 20/SB IA St Rt 27 at I-380/IA St Rt 27. The fly-over ramp is SB I-380. SB I-380; EB U.S. Rt. 20; SB IA St Rt 27 near Raymond.