Iowa Highway 3 (Iowa 3) is a state highway that runs from east to west across the state of Iowa. It is the longest state highway in Iowa, at 323 miles (520 km) long. Iowa 3 begins at the South Dakota state line where it continues as South Dakota Highway 50 and ends at the Northwest Arterial at the Dubuque city limits. It is designated the American Veterans Memorial Highway for its entirety. It is located approximately halfway between Interstate 80 and Interstate 90.

Iowa Highway 32 (Iowa 32), also known as the Northwest Arterial, was a state highway that ran through the northwest quadrant of Dubuque. At just over 5 miles (8.0 km) long, it was among the shortest state highways in the state. The highway began at U.S. Highway 20 in Dubuque and ended at US 52 / Iowa 3 in Sageville. With the exception of a small portion at the northern end, the entire highway was within the Dubuque city limits.