Sioux City sits where Iowa, Nebraska and South Dakota meet, on the bluffs above the Missouri River. I-29 runs along the river through downtown, connecting Sioux City with Omaha to the south and Sioux Falls to the north. I-129 crosses the Missouri into South Sioux City, Nebraska, where US 77 continues south. US 20 heads east across Iowa toward Fort Dodge, and US 75 runs north toward Le Mars. The Big Sioux River forms the western edge of the city and the South Dakota line, and the Floyd River cuts through the east side.
Inside the city, Gordon Drive and Hamilton Boulevard carry most of the traffic, along with Transit Avenue, Morningside Avenue and Lakeport Street on the southeast side. Downtown sits on the river flats, but much of the city climbs steep loess bluffs, so many neighborhoods have hilly streets, tight curves and sloped driveways. Breakdowns are most common on I-29 near downtown and on the busy commercial strips. The hills make winter driving especially tricky, because side streets ice over quickly and cars slide into curbs and each other.
Sioux Gateway Airport sits south of the city in Sergeant Bluff and shares its field with an Air National Guard refueling wing. Sioux City Transit runs buses across the city, but most people drive, many crossing state lines every day for work or shopping. Meat processing plants and other large employers on both sides of the river run early shifts, so a car that won't start before dawn is a familiar problem here. Travelers passing through on I-29 break down here too, often far from home and unsure where to turn.