Iowa Highway 12
|Maintained by Iowa DOT|
|Length:||46.212 mi (74.371 km)|
|Existed:||1920 – present|
|Loess Hills Scenic Byway|
|South end:||US 20 / US 75 at Sioux City|
|North end:||Iowa 10 in Hawarden|
Iowa Highway 12 (Iowa 12) is a 46.212-mile-long (74.371 km) state highway that runs from north to south in northwestern Iowa. The highway begins in eastern Sioux City at U.S. Highway 20 (US 20) and US 75. For the first seven and a half miles (12.1 km) of the route, Iowa 12 is an unsigned highway. The first five miles (8.0 km) are signed only as U.S. Highway 20 Business; the other two and a half miles (4.0 km) are overlapped by Interstate 29 (I-29). From here, the highway lies just east of the Big Sioux River, which separates Iowa from South Dakota. The northern end of Iowa 12 is in Hawarden at an intersection with Iowa 10.
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.
US 20 / US 75 / US 20 Business begins – South Sioux City, Neb., Le Mars, Fort Dodge
|Southern end of US 20 Business overlap|
US 75 Business (Lewis Boulevard)
I‑29 south (Loess Hills Scenic Byway) / US 77 south / US 20 Business / Wesley Parkway – South Sioux City, Neb.
|No southbound exit; northern end of US 20 Business overlap; southern end of I-29 overlap|
|5.311||8.547||149||To US 77 south (Wesley Parkway / US 20 Business west) / Hamilton Boulevard – South Sioux City, Nebr.||Northbound exit signed as Hamilton Boulevard only|
|7.527||12.114||151||I-29 north – Sioux Falls||Northern end of I-29 overlap; signed southern end of Iowa 12|
|Plymouth||Westfield Township||28.359||45.639||Iowa 3 west – Vermillion, S.D.||Southern end of Iowa 3 overlap|
|Akron||33.094||53.260||Iowa 3 east (South Street) / Loess Hills Scenic Byway ends – Le Mars||Northern end of Iowa 3 overlap|
|33.861||54.494||To SD 48 via Big Sioux River Road – Alcester, S.D.|
|Sioux||Hawarden||46.212||74.371||Iowa 10 north (Avenue E) / Iowa 10 south (10th Street) – Alcester, S.D., Beresford, S.D., Orange City|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi
- "2014 Volume of Traffic on the Primary Road System of Iowa" (PDF). Iowa Department of Transportation. January 1, 2014. Retrieved July 17, 2015.