Iowa Highway 12

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Iowa Highway 12 marker

Iowa Highway 12
Route information
Maintained by Iowa DOT
Length: 46.274 mi[1] (74.471 km)
Existed: 1920 – present
Major junctions
South end: US 20 / US 75 at Sioux City
North end: Iowa 10 in Hawarden
Highway system
Iowa 10 Iowa 13

Iowa Highway 12 is a state highway that runs from north to south in northwestern Iowa. Highway 12 is a short state highway in Iowa, with a length of 46.05 miles (74.11 km) long. The highway lies east of the Big Sioux River, which separates Iowa from South Dakota, for its length. The official southern terminus of Iowa Highway 12 is in eastern Sioux City at U.S. 20 and U.S. 75, though the signed southern terminus of is in Sioux City at an interchange with Interstate 29. The northern terminus of Iowa 12 is in Hawarden at an intersection with Iowa Highway 10.

Route description[edit]

Iowa Highway 12 begins at U.S. 20 and U.S. 75 signed as Business US 20. It continues west through Sioux City and becomes concurrent with Interstate 29 going west to Riverside Boulevard, where signage begins. It follows Riverside Boulevard while it passes through the Riverside neighborhood in Sioux City. It passes past Stone State Park in northwestern Sioux City and continues northwest towards Westfield. It turns northeast to enter Westfield, then intersects Iowa Highway 3. Iowa 12 and Iowa 3 overlap and go northeast to Akron, where Iowa 3 turns east. Iowa 12 continues northeast through Chatsworth and ends at Iowa 10 in Hawarden.


Iowa Highway 12 was designated as a state highway in 1920. It originally went between Hamburg and Akron. It was shortened to Missouri Valley in 1924, and Sioux City in 1926. In 1931, it was extended north to Hawarden. In 1958, it was shortened to its intersection with I-29, but then in 1979, was extended east along I-29 and the newly formed Business Route 20 to end at the new U.S. 20 bypass in eastern Sioux City. In 2000, signage for this extension was removed and signage for Iowa 12 ended at I-29, though officially, Iowa 12 continues east through Sioux City.

Major intersections[edit]

County Location mi km Destinations Notes
Woodbury Sioux City 0.000 0.000
US 20 / US 20 Business / US 75
South end of US 20 Bus. overlap
3.269 5.261
US 75 Business (Lewis Boulevard)
4.788 7.706
I-29 south / US 77 south (Wesley Parkway) / US 20 Business
North end of US 20 Bus. overlap; south end of I-29 overlap
7.595 12.223 I-29 north North end of I-29 overlap; signed south end of Iowa 12
Plymouth Westfield 28.421 45.739 Iowa 3 west South end of Iowa 3 overlap
Akron 33.156 53.359 Iowa 3 east (South Street) North end of Iowa 3 overlap
33.923 54.594 To SD 48 via Big Sioux River Road
Sioux Hawarden 46.274 74.471 Iowa 10 north (Avenue E) / Iowa 10 south (10th Street)
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


Route map: Bing