U.S. Federal Route 77 briefly enters the State of Iowa. This crosses the Missouri River from Nebraska and ends at the pace of the bridge. It use to head north into South Dakota, but was pulled back to the intersection with Interstate 29/BUSN U.S. Rt. 20. U.S. Rt. 77 passes thorugh the following town in Woodbury County. Sioux City U.S. Rt. 77 is multi-plexed in Woodbury County. BUSN U.S. Rt. 20, at Sioux City. U.S. Rt. 77 intersects the following highways in Woodbury County. Interstate 29, at Sioux City. BUSN U.S. Rt. 20, at Sioux City.